Field Efficiency of Certain Biopesticides and Neem Products Against Helicoverpa armigera (Hubner) on Chickpea (Cicer arietinumL.)

2019 ◽  
Vol 10 (01) ◽  
Author(s):  
Nihad H. Mutlag ◽  
Ameer S. A. Al-Haddad
Keyword(s):  
Helicoverpa Armigera ◽  
Block Design ◽  
Individual Treatment ◽  
Neem Oil ◽  
Larval Population ◽  
Neem Cake ◽  
Combination Treatments ◽  
Randomized Block Design ◽  
Helicoverpa Armígera ◽  
Nuclear Polyhedrosis

A field study was conducted to evaluate the efficiency of four microbial insecticides viz. Beauveria bassiana; HaNPV (Helicoverpa armigera Nuclear Polyhedrosis virus); (Bacillus thuringiensisvar.kurstaki 2 gm/L); HaNPV+Bt; neem oil; neem cake and D.D.V.P EC 76% @0.05% at Research Farm SHIATS,Allahabad during rabi season of 2011-2012. The experiment was laid out in randomized block design with seven treatment and replicated thrice. The observation larval populations of H. armigera were recorded one day before treatment was recorded at 3,7, and 10 days after treatments. The larva population of H. armigera appeared in the third week of February (8 the Standard week) and reached its peak of 14.65 larvae in first week of April and decline rapidly with maturation of crop. There was only one peak in the larval population observation in the 1st week. Bacillus thuringiensis was the most effective chemical by D.D.V.P.76%@0.05% . Among the microbial insecticides. HaNPV ,was the most effective followed by HaNPV+Bt and neem cake . The combination treatments were less effective than the individual treatment neem oil and B. bassiana were the least effective treatment in reducing the larval population of Heliverpa armigera.

Evaluation of biopesticides against gram pod borer Helicoverpa armigera (HUB.) on pigeonpea

2016 ◽  
Author(s):  
Sagar Anand Pandey ◽  
S. B. Das
Keyword(s):  
Field Experiment ◽  
Grain Yield ◽  
Helicoverpa Armigera ◽  
Block Design ◽  
Pigeon Pea ◽  
Larval Population ◽  
Randomized Block Design ◽  
Pod Borer ◽  
Helicoverpa Armígera ◽  
Major Pest

A field experiment on evaluation of biopesticides against gram pod borer (Helicoverpa armigera Hub.) on pigeon pea was carried out during kharif season of 2012-13. The experiment was laid out in randomized block design with three replications. Gram pod borer is a major pest of pigeon pea in India. For the management of this pest seven biopesticides were tested along with control. Among the biopesticides, Beauveria bassiana @ 1 liter / ha (1x1012 spores/ml) was found to be most effective biopesticide as it recorded lowest larval population (6.68 larvae / 5plants). The highest larval population was recorded in control (12.61 larvae /5 plants). The least effective treatment was Paecilomyces fumosoreseus (9.31 larvae /5 plants). Similar trend was observed in the grain yield as 1667.55 kg/ha, 709.41kg/ha and 1025.21kg/ha , respectively.

scholarly journals THE BIOLOGICALTEST OF FORMULATION OF SUBCULTURE Helicoverpa armigera Nuclear PolyhedrosisVirus(HaNPV) against Crocidolomia pavonana Fab. LARVAE POPULATIONTHAT EXPOSED TO CABBAGE (Brassica oleracea var. capitata L.)

2015 ◽  
Vol 2 (1) ◽  
pp. 649
Author(s):  
Anasthasia Vehuliza Surbakti ◽  
Mia Miranti ◽  
Melanie .
Keyword(s):  
Brassica Oleracea ◽  
Helicoverpa Armigera ◽  
Nuclear Polyhedrosis Virus ◽  
Block Design ◽  
Pilot Project ◽  
Water Control ◽  
Randomized Block Design ◽  
Carrier Materials ◽  
Helicoverpa Armígera ◽  
Nuclear Polyhedrosis

<p>The biologicaltest of formulation of subculture Helicoverpa armigera Nuclear Polyhedrosis Virus(HaNPV) against Crocidolomia pavonana Fab.larvae population that exposed to cabbage (Brassica oleracea var. capitata L.) has been done. The subculture HaNPV was formulated in liquid preparations, powders, cornstarch and talc carrier materials, sprayed to C. pavonana larvae population that exposed at cabbage as a pilot project. The method of research used an experimental method, with randomized block design consists of single factor HaNPV and five level formulation there were (p) (liquid dosage forms (p1), powder (p2), and mixed with a carrier such as cornstarch (p3) and talc powder (p4) as well as the provision of water control without virus (p0)) with 8 replications. The density of virus 4x107 polyhedral/ml. The results was statistically analyzed with ANOVA (p&lt;0,05), showed that all formulation HaNPV subculture have equal ability to caused high mortality of C. pavonana larvae population. <br /><strong></strong></p><p><strong>Keywords</strong>: Cabbage, Crocidolomia pavonana, Formulation,HaNPV, Mortality</p>

scholarly journals PENGARUH UKURAN BRAKTEA BEBERAPA AKSESI KAPAS TERHADAP TINGKAT SERANGAN HAMA PENGGEREK BUAH Helicoverpa armigera (HUBNER)

2020 ◽  
Vol 13 (4) ◽  
pp. 125
Author(s):  
IG.A.A. INDRAYANI ◽  
SIWI SUMARTINI
Keyword(s):  
Helicoverpa Armigera ◽  
Morphological Character ◽  
Insect Pests ◽  
Block Design ◽  
Morphological Characters ◽  
Floral Bract ◽  
Randomized Block Design ◽  
Cotton Plants ◽  
American Bollworm ◽  
Helicoverpa Armígera

<p>ABSTRAK<br />Hingga kini teknik perakitan varietas kapas tahan hama masih<br />dilakukan secara konvensional berdasarkan beberapa karakter morfologi<br />tanaman, seperti: bulu daun, daun okra, braktea berpilin, nektar, dan<br />gosipol tinggi. Karakter-karakter ini diketahui erat hubungannya dengan<br />ketahanan terhadap hama, khususnya H. armigera. Berkaitan dengan<br />serangan H. armigera pada buah, diduga ada bagian-bagian buah kapas<br />yang berkontribusi secara langsung pada serangan hama ini, misalnya<br />braktea buah. Namun demikian, besarnya pengaruh braktea terhadap<br />kerusakan buah kapas perlu dipelajari dalam upaya meminimalkan<br />kerusakan. Penelitian ini bertujuan untuk mengetahui pengaruh ukuran<br />braktea terhadap tingkat kerusakan buah oleh H. armigera pada beberapa<br />aksesi kapas. Penelitian dilaksanakan di Kebun Percobaan Balai Penelitian<br />Tanaman Tembakau dan Serat, di Asembagus, Situbondo, Jawa Timur<br />mulai bulan Januari hingga Desember 2006. Sebanyak 18 aksesi dari 50<br />aksesi kapas dengan berbagai variasi ukuran braktea digunakan sebagai<br />perlakuan. Setiap perlakuan (aksesi) disusun dalam rancangan acak<br />kelompok (RAK), dengan tiga kali ulangan. Lima tanaman kapas dari<br />masing-masing aksesi ditentukan secara acak, dan sebanyak 5 buah kapas<br />muda (diameter ± 4 cm) dipetik dari masing-masing tanaman sampel,<br />kemudian dibawa ke laboratorium untuk diukur luas braktea dan buahnya.<br />Selain itu dilakukan pula pengamatan kerusakan buah dan hasil kapas<br />berbiji di lapang. Hasil penelitian menunjukkan bahwa ukuran braktea<br />berkorelasi positif dengan tingkat kerusakan buah (R 2 = 0,9014), sehingga<br />braktea berukuran besar dan lebar serta menutupi buah secara total<br />berpotensi mengalami kerusakan akibat serangan H. armigera lebih tinggi<br />dibanding braktea berukuran kecil dan sempit. Ukuran panjang dan lebar<br />braktea pada 18 aksesi kapas bervariasi antar aksesi dan masing-masing<br />berkorelasi positif dengan luas (R 2 = 0,876; R 2 = 0,894). Hasil penelitian<br />ini dapat dimanfaatkan dalam merakit varietas tahan hama, dan<br />kombinasinya dengan karakter-karakter morfologi kapas yang sudah ada<br />untuk menghasilkan varietas kapas baru dengan tingkat ketahanan yang<br />lebih tinggi terhadap hama penggerek buah H. armigera.<br />Katakunci : Braktea, Helicoverpa armigera, aksesi kapas, karakter<br />morfologi.</p><p><br />ABSTRACT<br />Effects of bract size of several cotton accessions to<br />American bollworm injury level<br />Conventional  method  by  crossing  technique  based  on<br />morphological characters of plant is now still used in providing resistant<br />varieties of cotton against insect bollworms. A number of genetic<br />characters are now available and have been studying for their assosiation<br />with insect pests resistance such as hairiness, okra leaf, frego bract,<br />nectariless, and high gossypol. Regarding to boll damage by H. armigera,<br />it can be mentioned that there are many other morphological characters of<br />cotton attributable to bollworm damage, such as floral bract. As a part of<br />boll, it is estimated that bracts assosiated with bollworm attacked due to<br />their larger size compared with boll size. Objective of the study was to find<br />out the effect of bract size in relation to bollworm damage on cotton<br />accessions. The study was conducted at Experimental Station of<br />Indonesian Tobacco and Fiber Crops Research Institute in Asembagus,<br />Situbondo, East Java from January to December 2006. Eighteen of fifty<br />cotton accessions were used as treatment and they were arranged in<br />Randomized Block Design (RBD) with three replications. Five randomly<br />cotton plants from each accession and five young bolls were sampled<br />from the selected plant with about 4 cm of diameter were brought in the<br />laboratory to collect information on bract and boll sizes. Bollworm<br />damage was determined by counting the damaged bolls in the field as well<br />as the seed cotton yield. Result showed that bract size was positively<br />correlated with boll damage (R 2 = 0.9014). Higher damaged bolls occured<br />on bolls which is covered completely by bracts. There is variation between<br />length and wide size of bracts among cotton accessions and both showed<br />positive correlation to bract area (R 2 = 0.876; R 2 = 0.894). Based on this<br />study, higher resistance of cotton variety against H. armigera will<br />possiblly be provided through combination between bract size and any<br />other morphological characters of cotton.<br />Key words : Floral bract, Helicoverpa armigera, cotton accession,<br />morphological character</p>

Bioefficacy of Chlorantraniliprole 18.5 SC Against Pod Borer, Helicoverpa armigera (Hubner) and Pod Fly, Melanagromyza obtusa (Malloch) in Pigeonpea, Cajanus cajan (Linn.) Millsp.

2021 ◽  
Author(s):  
S.K. Khinchi ◽  
K.C. Kumawat
Keyword(s):  
Helicoverpa Armigera ◽  
Cajanus Cajan ◽  
Block Design ◽  
High Toxicity ◽  
Randomized Block Design ◽  
Pod Borer ◽  
The World ◽  
Market Sample ◽  
Helicoverpa Armígera ◽  
Helicoverpa Armigera Hubner

Background: Pod borer, Helicoverpa armigera (Hubner) and pod fly, Melanagromyza obtusa (Malloch) are important pod boring insects infesting the pigeonpea, Cajanus cajan (Linn.) Millsp. throughout the world. A number of synthetic insecticides are known to be effective against these borers but most of them have been phased out as a result of high toxicity to the pollinators and other biotic agencies, therefore, a new molecule, chlorantraniliprole has been tested for bioefficacy against these insect pests.Methods: The experiment was conducted during Kharif, 2017 in a Randomized Block Design (RBD) with 7 treatments and 3 replications. Observations were made to record pod borer, H. armigera and pod fly, M. obtusa maggot present before treatment imposition and 3, 7 and 14 days after each spray from five randomly selected and tagged plants/ plot. From the data recorded per cent reduction in population over control was calculated. The per cent pod damage was calculated by counting damaged pods out of healthy pods. The numbers of coccinellids and spiders were recorded on 5 randomly selected plants before treatment and 7 and 14 days after spray (DAS) in each treatment.Result: The chlorantraniliprole 18.5 SC was found most effective @ 200 ml/ha which was found at par with chlorantraniliprole 18.5 SC @ 150 ml/ha and chlorantraniliprole 18.5 SC (Market sample) @ 150 ml/ha for suppression pod borer, H. armigera and pod fly, M. obtusa. The yield was maximum and at par in the chlorantraniliprole 18.5 SC @ 200 ml/ha (18.25 q ha-1), chlorantraniliprole 18.5 SC @ 150 ml/ha (17.82 q ha-1) and chlorantraniliprole 18.5 SC (Market sample) @ 150 ml/ha (17.42 q ha-1). Predatory population of coccinellids and spiders after imposing the treatments declined to some extent at seven days after treatment, however, increased after 14 days. Based on the results, the use of chlorantraniliprole 18.5 SC @ 150 ml/ha was most effective to control pod borer and pod fly in pigeonpea crop.

scholarly journals Biological Test of Formulation of Subculture Helicovepa armigera Nuclear Polihedrosis Virus (HaNPV) on Mortality of Spodoptera litura Larvae infested to cabbage (Brassica oleracea Var. capitata Linn.) Plantation

2015 ◽  
Vol 2 (1) ◽  
pp. 646
Author(s):  
Desy Efriyani Anggraeny Nasution ◽  
Mia Miranti ◽  
Melanie .
Keyword(s):  
Brassica Oleracea ◽  
Helicoverpa Armigera ◽  
Spodoptera Litura ◽  
Nuclear Polyhedrosis Virus ◽  
Insect Pests ◽  
Block Design ◽  
Economic Value ◽  
Helicoverpa Armígera ◽  
Polyhedrosis Virus ◽  
Nuclear Polyhedrosis

<p>Helicoverpa armigera Nuclear Polyhedrosis Virus (HaNPV) is one of the biological agents that could be used for the development of organic farming in Indonesia. One of the organic agricultural food products which have high economic value is cabbage, HaNPV effectif to control the population of several species of insect pests, can be used instead of synthetic insecticides in agricultural development efforts of organic cabbage. HaNPV formulation can be used as a way to maintain the virulence properties of the virus and facilitate the storage and application. The preparation of subculture HaNPV formulations was in liquid, powders, cornstarch and talk carrier material. The design experimental was used randomized block design consists single factor (type HaNPV formulation consisting of powder formulations, liquid formulation, formulation in cornstarch, and talc formulation including water formulation without virus as a control), with eight replications. The results showed that all of the formulations of subculture HaNPV causing larvae mortality at range 97.4% -100%. The highest mortality of larvae occurred in cabbage plants are protected by HaNPV carrier liquid and talk preparations by 100% each. <br /><strong></strong></p><p><strong>Keywords</strong>: Formulations Helicoverpa armigera Nuclear Polyhedrosis Virus (HaNPV), subculture, Spodoptera litura, Brassica oleracea Var. capitata Linn.</p>

Screening of some chickpea (Cicer arietinum L.) varieties against Helicoverpa armigera under semi arid climatic conditions

2016 ◽  
Author(s):  
Shafiq Ur Rehman ◽  
Muhammad Waqar Hassan ◽  
Moazzam Jamil ◽  
Muhammad Akram
Keyword(s):  
Cicer Arietinum ◽  
Helicoverpa Armigera ◽  
Block Design ◽  
Climatic Conditions ◽  
Pest Population ◽  
Weather Factors ◽  
Larval Population ◽  
Cicer Arietinum L ◽  
Helicoverpa Armígera ◽  
Semi Arid

Nine desi chickpea (Cicer arietinum L.) varieties viz., Balkasar-2000, Bhakhar-2011, Bittal-98, Brc-61, Brc-390, Punjab-2000, Punjab-2008, Thall-2006 and 03009 were sown at experimental area of Islamia University of Bahawalpur in randomized complete block design (RCBD) with three replications each during 2014-2015. 03009 had highest mean larval population of Helicoverpa armigera followed by Bittal-98, Thall-2006 and Bhakhar-2011. Punjab-2000, BRC-390 and BRC 61 exhibited moderate larval population. The least larval population was observed in Punjab-2008 and Balkasar-2000. Maximum per cent pod damage was observed in Bittal-98 (28.29) followed by 03009 (26.57), Bhakhar-2011 (25.47), Thall-2006 (24.27), Punjab-2000 (22.81), BRC-390 (21.70), BRC-61 (20.53), Balkasar-2000 (18.30) and Punjab-2008 (16.73). Highest yield of crop was observed in Punjab-2008 (516.35gplot-1) followed by Balkasar-2000 (483.38), BRC-61 (415.15), BRC-390 (380.03), Punjab-2000 (345.34), Bittal-98 (303.50), Bhakhar-2011 (298.43), Thall-2006 (293.55) and 03009 (209.99) g/plot. It was also observed that larval population of H. armigera increased or decreased with weather factors. Thus varieties showing more pest population yielded less and those with less pest population generated more yield of chickpea. These results can be employed for integrated pest management of H. armigera on chickpea in different semi arid climatic conditions.

scholarly journals EFEKTIVITAS FORMULA JAMUR Beauveria bassiana DALAM PENGENDALIAN PENGGEREK BUAH KAPAS (Helicoverpa armigera)

2020 ◽  
Vol 19 (4) ◽  
pp. 178
Author(s):  
IGAA. INDRAYANI ◽  
DECIYANTO SOETOPO ◽  
JOKO HARTONO
Keyword(s):  
Beauveria Bassiana ◽  
Helicoverpa Armigera ◽  
Block Design ◽  
Field Testing ◽  
Cotton Yield ◽  
Seed Cotton ◽  
Pathology Laboratory ◽  
Seed Cotton Yield ◽  
Randomized Block Design ◽  
Helicoverpa Armígera

<p>ABSTRAK<br />Jamur entomopatogen Beauveria bassiana sangat potensial<br />mengendalikan berbagai serangga hama, namun potensinya terhadap<br />penggerek buah kapas (Helicoverpa armigera) belum banyak diteliti.<br />Tujuan penelitian adalah untuk mengetahui efektivitas B. bassiana<br />terhadap H. armigera. Penelitian dilakukan di Laboratorium Patologi<br />Serangga dan Kebun Percobaan Karangploso, Balai Penelitian Tanaman<br />Pemanis dan Serat mulai Januari hingga Desember 2012. Penelitian terdiri<br />atas dua kegiatan di lapangan, yaitu (1) uji efektivitas B. bassiana terhadap<br />H. armigera di pot, dan (2) uji efektivitas B. bassiana terhadap H.<br />armigera di lapangan. Kegiatan pertama terdiri dari delapan perlakuan<br />konsentrasi B. bassiana, yaitu: (1) 3,7 x 10 4 ; (2) 7,7 x 10 4 ; (3) 1,2 x 10 5 ;<br />(4) 1,5 x 10 5 ; (5) 1,9 x 10 5;  (6) 2,3 x 10 5;  (7) 2,5 x 10 5 ; (8) 3,0 x 10 5<br />konidia/ml; dan (9) kontrol. Perlakuan disusun dalam Rancangan Acak<br />Kelompok dengan 3 kali ulangan. Parameter yang diamati adalah<br />mortalitas dan bobot larva hidup. Kegiatan kedua terdiri dari empat<br />perlakuan konsentrasi B. bassiana, yaitu: (1) 3,1 x 10 11 ; (2) 6,2 x 10 11 ; (3)<br />9,3 x 10 11 ; dan (4) 1,2 x 10 12 konidia/ha dengan dua pembanding<br />(azadirachtin dan betasiflutrin), serta kontrol. Perlakuan disusun dalam<br />Rancangan Acak Kelompok dengan tiga kali ulangan. Parameter yang<br />diamati adalah populasi larva H. armigera dan laba-laba, kerusakan buah<br />kapas, dan hasil kapas berbiji. Hasil uji efektivitas di pot menunjukkan<br />hingga hari ke-7 setelah perlakuan B. bassiana masih efektif menyebabkan<br />mortalitas larva H. armigera sebesar 46,7% dan meningkatkan kehilangan<br />bobot larva hidup hingga 59,3%, terutama pada konsentrasi 2,3 x 10 5<br />konidia/ml. Di lapangan, perlakuan jamur B. bassiana efektif menurunkan<br />populasi larva H. armigera sekitar 36-48%, tetapi menurunkan populasi<br />laba-laba hingga 48,4%, sehingga kurang aman bagi musuh alami tersebut.<br />Perlakuan B. bassiana dapat menurunkan kerusakan buah kapas 10,1-<br />10,3% dengan meningkatkan hasil kapas berbiji sekitar 12,1-29,7%.<br />Kata kunci: Beauveria bassiana, Helicoverpa armigera, konidia, larva,<br />mortalitas</p><p>ABSTRACT<br />Beauveria bassiana is the most common fungal entomopathogen<br />against several of insect pests. Its potency, however, has not been tested on<br />cotton bollworm, H. armigera. The objective of study was to know the<br />effectivity of B. bassiana against H. armigera. This study had been<br />conducted at Pathology Laboratory and Experimental Station of<br />Indonesian Sweetener and Fiber Crops Research Institute (ISFCRI) from<br />January to December 2012. The study consists of two field tests, e.g. test<br />on B. bassiana effectivity against H. armigera (polybag testing) dan test<br />on B. bassiana effectivity a against H. armigera (field testing). In polybag<br />testing, eight concentrations of B. bassiana and one control were used as<br />treatment, e.g. (1) 3.7 x 10 4 ; (2) 7.7 x 10 4 ; (3) 1.2 x 10 5 ; (4) 1.5 x 10 5 ; (5)<br />1.9 x 10 5;  (6) 2.3 x 10 5;  (7) 2.5 x 10 5 ; (8) 3.0 x 10 5  conidia/ml; and (9)<br />control. Each treatment was arranged in Randomized Block Design with<br />three replications. Parameters recorded were mortality and weight of<br />survival larvae. The field testing consists of four concentrations of B.<br />bassiana viz. 3.1 x 10 11 ; 6.2 x 10 11 ; 9.3 x 10 11 ; and (4) 1.2 x 10 12 conidia/ha<br />which compared to azadirachtin and betacyfluthrin. Each treatment was<br />arranged in Randomized Block Design with three replications. Parameter<br />observed were population of H. armigera larvae and its natural enemy<br />(spiders), boll damage, and seed cotton yield. Result showed that until the<br />day seventh the mortality of H. armigera larvae reached 46.7% due to B.<br />bassiana and loss 59.3% of larval weight at 2,3 x 10 5 conidia/ml in<br />polybag testing. In field testing, B. bassiana proved to be relatively<br />harmful to spiders because it reduced the their population as 48.4%.<br />However, the B. bassiana reduced of 36-48% the population of H.<br />armigera larvae as well as the cotton boll damage of 10.1-10.3% and<br />increased the seed cotton yield ranged 12.1-29.7%.<br />Key words: Beauveria bassiana, Helicoverpa armigera, conidia, larvae,<br />mortality</p>

scholarly journals ​Bio-efficacy of Chemical Insecticides and Biopesticides against Gram Pod Borer, Helicoverpa armigera (Hubner) and Spotted Pod Borer, Maruca testulalis (Geyer) on Greengram, [Vigna radiata (L.) Wilczek]

2021 ◽  
Author(s):  
V.P. Meena ◽  
S.K. Khinchi ◽  
D.K. Bairwa ◽  
Akhter Hussain ◽  
K.C. Kumawat ◽  
...  
Keyword(s):  
Helicoverpa Armigera ◽  
Vigna Radiata ◽  
Insect Pests ◽  
Block Design ◽  
Maruca Testulalis ◽  
College Of Agriculture ◽  
Randomized Block Design ◽  
Pod Borer ◽  
Helicoverpa Armígera ◽  
Helicoverpa Armigera Hubner

Background: Gram pod borer, Helicoverpa armigera (Hubner) and spotted pod borer, Maruca testulalis (Geyer) are important pod boring insects infesting the greengram, [Vigna radiata (L.) Wilczek] throughout the India. A number of synthetic insecticides are known to be effective against these borers but most of them have been phased out as a result of high toxicity to the pollinators and other biotic fauna, therefore, a group of new chemical insecticides with biopesticides have been tested for bioefficacy against these insect pests. Method: A field experiment was conducted at S.K.N. College of Agriculture, Jobner, Rajasthan during kharif, 2018 in randomized block design (RBD) with 9 treatments and 3 replications. The observations were recorded of Helicoverpa armigera (Hubner) and spotted pod borer, Maruca testulalis (Geyer) borers one day before and 1, 3, 7 and 15 days after application of insecticides and biopesticides in each the spray from ten randomly selected and tagged plants/ plot. From the data recorded per cent reduction in population over control was calculated. The per cent pod damage was calculated by counting damaged pods out of healthy pods of greengram. Result: The spinosad 45 SC (0.01%) proved to be most effective, indoxacarb 14.5 SC (0.01%) followed by fipronil 5 SC (0.01%), whereas, treatments of neem leaf extract (10.00%), Beauveria bassiana 1.15 WP 1X108 spore/ l proved to be least effective. The maximum seed yield of 9.13 q ha–1 was obtained in the plots treated with spinosad 45 SC (0.01%) followed by indoxacarb 14.5 SC (0.01%) (8.89 q ha-1), fipronil 5 SC (0.01%) (8.60 q ha-1).

scholarly journals PATOGENISITAS DUA ISOLAT LOKAL JAMUR Nomuraea rileyi (FARLOW) SAMSON TERHADAP Helicoverpa armigera HUBNER (LEPIDOPTERA: NOCTUIDAE)

2020 ◽  
Vol 19 (1) ◽  
pp. 1
Author(s):  
IGAA. INDRAYANI ◽  
HERI PRABOWO ◽  
SRI MULYANINGSIH
Keyword(s):  
Helicoverpa Armigera ◽  
Block Design ◽  
Larval Mortality ◽  
Host Population ◽  
Cotton Leaf ◽  
Nomuraea Rileyi ◽  
Larval Weight ◽  
Randomized Block Design ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

<p>ABSTRAK<br />Epizootik Nomuraea rileyi telah berkembang secara alami dalam<br />populasi lebih dari 30 spesies serangga inang, termasuk H. armigera.<br />Penelitian ini dilakukan di Laboratorium Patologi Serangga Balai<br />Penelitian Tanaman Pemanis dan Serat Malang mulai Januari hingga<br />Desember 2011, tujuannya untuk mengetahui patogenisitas dua isolat lokal<br />jamur entomopatogen N. rileyi terhadap larva H. armigera. Penelitian<br />terdiri atas dua faktor perlakuan, faktor 1 adalah dua isolat lokal N. rileyi,<br />yaitu ML 01 dan LG 02, dan faktor 2 adalah konsentrasi konidia, yaitu: 2,2<br />x 10 5 ; 4,5 x 10 5 ; 2,2 x 10 6 ; 4,5 x 10 6 ; 2,2 x 10 7 ; 4,5 x 10 7 ; 2,2 x 10 8 ; 4,5 x<br />10 8 konidia/ml, dan kontrol. Setiap perlakuan disusun dalam Rancangan<br />Acak Kelompok Faktorial dengan tiga kali ulangan. Aplikasi jamur pada<br />larva H. armigera dilakukan dengan metode kontaminasi permukaan<br />media yang berupa daun kapas muda (1cm 2 ) di dalam ruangan bersuhu<br />25±1⁰C dan kelembapan 75-80%. Parameter yang diamati adalah<br />mortalitas larva, LC 50 dan LT 50 , serta bobot larva. Hasil penelitian<br />menunjukkan bahwa tingkat patogenisitas isolat ML 01 terhadap larva H.<br />armigera lebih tinggi dibandingkan dengan isolat LG 02. Isolat ML 01<br />menyebabkan mortalitas larva H. armigera antara 51,13-85,56% (LC 50  =<br />2,5 x 10 2  Konidia/ml) dan isolat LG 02 antara 43,36-78,90%, (LC 50  =<br />5x10 6  Konidia/ml). LT 50 isolat ML 01 antara 5,2-5,5 hari, sedangkan isolat<br />LG 02 antara 6,8-7,0 hari, terutama pada konsentrasi 2,2-4,5 x 10 8<br />konidia/ml. Terdapat korelasi positif yang erat antara konsentrasi konidia<br />dan mortalitas larva baik pada isolat ML 01 (r=0,975) maupun LG 02<br />(r=0,980), demikian pula antara konsentrasi konidia dan kehilangan bobot<br />larva pada isolat ML 01 (r=0,982) dan LG 02 (r=0,972).<br />Kata kunci: Helicoverpa armigera, Nomuraea rileyi, patogenisitas, isolat,<br />mortalitas</p><p>ABSTRACT<br />The epizootic of the fungi Nomuraea rileyi has naturally developed<br />in more than 30 species of insect host population, including cotton<br />bollworm, H. armigera. A study on pathogenicity of two local isolates of<br />Nomuraea rileyi (Farlow) Samson fungi against Helicoverpa armigera<br />(Hubner) (Lepidoptera: Noctuidae) was conducted at Insect Pathology<br />Laboratory of Indonesian Sweeteners and Fibers Crops Research Institute<br />(ISFCRI) in Malang from January to December 2011 in order to find out<br />the pathogenicity of the isolates against H. armigera larvae. This study<br />consists of two factors as treatment. The first factor was N. rileyi isolates,<br />e.g. ML 01 and LG 02, and the second factor were eight conidia<br />concentrations, viz. 2.2 x 10 5 ; 4.5 x 10 5 ; 2.2 x 10 6 ; 4.5 x 10 6 ; 2.2 x 10 7 ; 4.5<br />x 10 7 ; 2.2 x 10 8 ; 4.5 x 10 8 conidia/ml, and one untreated control.<br />Treatments were arranged in Factorial Randomized Block Design with<br />three replications. Suspense of conidia was applied by surface<br />contamination method of cotton leaf as medium at 25±1⁰C of temperature<br />and 75-80% of humidity. Parameter observed were larval mortality, LC 50 ,<br />LT 50 , and larval weight. Result showed that ML 01 isolate was more<br />pathogenic against H. armigera larvae than LG 02 isolate based on larval<br />mortality, LC 50 , and LT 50 . Percentage of mortality of H. armigera larvae<br />due to ML 01 and LG 02 infection were 51.1- 85.56% and 43.36-78.90%,<br />respectively. The LC 50 of ML 01 and LG 02 isolates was 5.2-5.5 days and<br />6.8-7.0 days, respectively.There are closest positive correlation between<br />conidia concentration and percentage of mortality on ML 01 (r = 0.975)<br />and LG 02 (r = 0.980) isolates as well as between conidia concentration<br />and larval weight loss on ML 01 (r = 0.982) and LG 02 (r = 0.972)<br />isolates.<br />Key words: Helicoverpa armigera, Nomuraea rileyi, pathogenicity,<br />isolate, mortality</p>

PENGARUH POPULASI TANAMAN DAN PENGGUNAAN MULSA TERHADAP POPULASI GULMA DAN HASIL PUCIL JAGUNG MANIS (ZEA MAYS SACCHARATA STURT) DI LAHAN KERING

AGRICA ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 124-133
Author(s):  
I Ketut Arsa Wijaya
Keyword(s):  
Zea Mays ◽  
Block Design ◽  
Plant Population ◽  
Cyperus Rotundus ◽  
Corn Kernel ◽  
Plastic Mulch ◽  
Rice Plants ◽  
Straw Mulch ◽  
Combination Treatments ◽  
Randomized Block Design

This study was conducted in Balai Benih Induk (BBI) Luwus, Baturiti District, Tabanan Regency, with the high of place 506m above sea level occurring in March to May 2014. This research used randomized block design arranged per factor, namely population of plants (P) including three steps: P1=80.000 plants per hectare, P2= 100.00 plants per hectare, P3= 120.000 per hectare; and mulch (M) that include: M0= without mulch and without cleaning, M1= without mulch with clean weeding, M2= rice plants straw mulch (5 ton per hectare) and M3= black silver plastic mulch. Eventually, there were 12 combination treatments, each of which was repeated 3 times to obtain 36 land slots. The research indicates that there was no real interaction between the treatment of plant population and mulch usage in all variables observed. The 100.000 plant population per hectare can produce the weight of dry and fresh oven corn kernel without highest cornhusk that was to say 4.79 tons and 0.53 tons or 11.66 % and 20.45% higher compared to 120.000 plant population per hectare. The use of black silver plastic and rice plants straw mulch can produce the weight of fresh and dry oven corn kernel without cornhusk per hectare each of which is 4.69 tons, 4.57 tons, and 0.54 tons, 0.47 tons or 26.76%, 38.46 %, and 23.51 %, 20.51 % higher than without mulch and without clean weeding. Clean weeding treatment can produce the weight of fresh and dry oven corn kernel without cornhusk per hectare with its weight of 4.63 tons and 0.51 tons or 25.35 % and 35.90 % higher than without mulch and cleaning. Clean weeding treatment was not obviously different from mulch treatment. The identification of weed types were 19 kinds of weeds and Cyperus rotundus L. Weeds. They have the highest density and each absolute frequent of 1249.333 stems m-2 and 1.00.

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