scholarly journals KANESIA 10 - KANESIA 13: EMPAT VARIETAS KAPAS BARU BERPRODUKSI TINGGI

2020 ◽  
Vol 15 (1) ◽  
pp. 24
Author(s):  
EMY SULISTYOWATI ◽  
SIWI SUMARTINI
Keyword(s):  
Gossypium Hirsutum ◽  
Insect Pests ◽  
Fiber Strength ◽  
Block Design ◽  
The United States ◽  
Fiber Properties ◽  
Botanical Pesticide ◽  
Randomized Block Design ◽  
Fiber Fineness ◽  
Insecticide Spray

<p>ABSTRAK<br />Program perbaikan varietas kapas bertujuan meningkatkan<br />produktivitas dan mutu serat. Sembilan hasil persilangan kapas tahun 1997<br />dan 1998 yang melibatkan dua tetua dari Amerika Serikat (Deltapine<br />Acala 90 dan Deltapine 5690), tiga tetua dari India (LRA 5166, Pusa 1,<br />dan SRT 1), dan satu tetua dari Asia Tengah (Tashkent 2) telah melalui<br />tujuh pengujian di Jawa Timur, Nusa Tenggara Barat, dan Sulawesi<br />Selatan untuk menilai potensi produksi, mutu serat, dan tingkat ketahanan<br />terhadap beberapa hama di lahan tadah hujan dengan atau tanpa diproteksi<br />dengan insektisida. Perlakuan disusun dalam rancangan acak kelompok<br />(RAK) yang diulang tiga kali dalam kondisi diproteksi ataupun tanpa<br />diproteksi dengan insektisida pada petak-petak percobaan berukuran 40-50<br />m2 dengan jarak tanam (100 x 25) cm. Pengendalian hama pada ulanganulangan<br />yang diproteksi dengan insektisida adalah penambahan insektisida<br />benih Imidachloprit 10 ml/kg benih dan pengendalian hama H. armigera<br />sebanyak 5-6 kali menggunakan pestisida nabati Organeem (Azadirachtin<br />1%). Hasil pengujian menunjukkan bahwa Kanesia 10 – Kanesia 13<br />mampu berproduksi lebih tinggi apabila diproteksi dengan insektisida<br />dengan potensi produksi berturut-turut 19,32, 21,75, 17,05, dan 21,7%<br />lebih tinggi dari Kanesia 8, dan rata-rata produktivitas berturut-turut<br />adalah 2.457,2, 2.507,3, 2.410,5, dan 2.506,8 kg kapas berbiji per hektar.<br />Kanesia 10 dan Kanesia 11 memiliki kandungan serat berturut-turut 27,2%<br />dan 8,11% lebih tinggi dibandingkan Kanesia 8. Pada rekayasa Kanesia<br />10 - Kanesia 13 ini tidak diperoleh kemajuan genetik yang nyata pada<br />parameter mutu serat, akan tetapi mutu serat dari empat galur tersebut di<br />atas memenuhi kriteria industri tekstil yaitu dengan rata-rata karakteristik<br />mutu serat yaitu panjang serat 26,92 – 29,34 mm, kekuatan 27,13 – 29,50<br />g/tex, kehalusan 4,38-5,08 micronaire, dan keseragaman serat 83,3 –<br />84,6%.<br />Kata kunci : Gossypium hirsutum, kemajuan genetik, produktivitas, mutu<br />serat</p><p><br />ABSTRACT<br />Kanesia 10- Kanesia 13: Four New High Yielding Cotton Varieties<br />The cotton breeding program is focusing on the increase of<br />productivity and fiber properties. The 1997 and 1998 crossing program<br />involving two parents introduced from the United States of America<br />(Deltapine Acala 90 and Deltapine 5690), three parents introduced from<br />India (LRA 5166, Pusa 1, and SRT 1), and one variety originated from<br />Central Asia (Tashkent 2), have resulted in nine crosses which had been<br />tested in seven locations at East Java, West Nusa Tenggara, and South<br />Sulawesi to evaluate their yield potentials, fiber properties, and resistance<br />level to insect pests on rainfed areas with or without protection.<br />Experiments were arranged in randomized block design (RBD) with three<br />replications either with or without insecticide spray on 40-50 m2 plots with<br />(100 x 25) cm planting space. Insect controls were done by treating cotton<br />seed with 10 ml Imidachloprit per kg seed and 5-6 applications of<br />botanical pesticide Organeem (Azadirachtin 1%). Experimental results<br />showed that Kanesia 10-Kanesia 13 yield better when insects are<br />controlled. Their yield potentials are 19.32, 21.75, 17.05, and 21.7%<br />higher than Kanesia 8, respectively, and means of yield are 2,457.2,<br />2,507.3, 2,410.5, and 2,506.8 kg seed cotton, respectively. Kanesia 10 and<br />Kanesia 11 have 27.2 and 8.11% higher gin turnout, respectively than<br />Kanesia 8. On the engineering of Kanesia 10-Kanesia 13, there is no<br />improvement on the fiber properties, although they meet the textile<br />industries’ criteria i.e. staple length 26.92 – 29.34 mm, fiber strength 27.13<br />– 29.50 g/tex, fiber fineness 4.38-5.08 micronaire, and uniformity ratio<br />83.3 – 84.6%.<br />Key words : Gossypium hirsutum, genetic improvement, productivity,<br />fiber properties</p>

scholarly journals PERBAIKAN VARIETAS UNTUK PENINGKATAN PRODUKTIVITAS DAN MUTU SERAT KAPAS

2020 ◽  
Vol 15 (2) ◽  
pp. 66
Author(s):  
EMY SULISTYOWATI ◽  
SIWI SUMARTINI ◽  
ABDURRAKHMAN ABDURRAKHMAN ◽  
SRI RUSTINI
Keyword(s):  
Gossypium Hirsutum ◽  
Fiber Strength ◽  
Yield Potential ◽  
Productivity Level ◽  
Fiber Properties ◽  
Fiber Fineness ◽  
Pedigree Selection ◽  
Line Selection ◽  
The Stability ◽  
Potential Test

<p>ABSTRAK</p><p>Persilangan kapas yang dilakukan pada tahun 1999 denganmelibatkan 11 varietas kapas sebagai tetua betina dan lima varietas kapassebagai tetua jantan telah menghasilkan 22 set persilangan kapas. Adapuntujuan persilangan tersebut adalah untuk meningkatkan produktivitas danmutu serat varietas kapas nasional Indonesia. Program perbaikan varietasini menggunakan pendekatan seleksi pedigree pada F3, dan dilanjutkandengan seleksi galur pada generasi F5 dan selanjutnya. Pada kegiatanseleksi galur tahun 2004-2005 di Kebun Percobaan Asembagus, dari 22genotipe generasi F4 yang diseleksi dengan kriteria seleksi produktivitas &gt;3 ton kapas berbiji/ha telah dihasilkan 23 galur harapan. Pada generasi F6dilakukan uji daya hasil dari 23 galur tersebut. Dari pengujian daya hasilgalur-galur tersebut pada tahun 2006, telah dihasilkan enam galur harapanyang memiliki tingkat produktivitas secara statistika tidak berbeda denganatau lebih tinggi dari Kanesia 8 dengan panjang serat &gt; 1,16 inch, kekuatanserat &gt; 30,77 g/tex, dan kehalusan serat antara 3,5 – 4,5 mic, yaitu99004/5, 99005/9, 99013/5, 99023/5, 99023/7, dan 99023/8. Galur-galurtersebut selanjutnya akan diuji secara multilokasi untuk menilai stabilitasekspresi genetiknya di beberapa wilayah pengembangan kapas.</p><p>Kata kunci : Gossypium hirsutum, kapas, produktivitas, mutu serat</p><p>ABSTRACT</p><p>Varietal Improvement for Increase of Productivity andQuality of Cotton Fiber Cotton breeding conducted since 1999 involving 11 varieties asfemale parent, and five varieties as male parents has resulted in 22crossing sets. The aim was to improve productivity level as well as fiberquality of national cotton varieties of Indonesia. The breeding approachwas accomplished by pedigree selection on F3 generation, which was thencontinued with line selection from F5 generation. From the line selectionactivity carried out at Asembagus Experimental Station during 2004-2005,out of 22 genotypes selected at the F4 generation based on productivitylevel of &gt; 3 ton seed cotton/ha as selection criteria, 23 promising lines hadbeen selected which were then tested in a yield potential test. From theyield potential test conducted in 2006, six promising lines had beenselected whose productivity levels were statistically not different from orhigher than Kanesia 8 with fiber length of &gt;1.16 inch, fiber strength&gt;30.77 g/tex, and fiber fineness 3.5-4.5 mic. Those promising lines wouldthen be tested in multilocation trials to evaluate the stability of theirgenetic expression in several cotton development areas.</p><p>Key words : Gossypium hirsutum, cotton, productivity, fiber properties</p>

scholarly journals Comparison of The Fiber Characteristics of the Some Cotton Varieties Ginned by Using Sawgin and Rollergin

2021 ◽  
Vol 9 (6) ◽  
pp. 946-952
Author(s):  
Sevtap Kartal ◽  
Lale Efe
Keyword(s):  
Fiber Length ◽  
Fiber Strength ◽  
Fiber Quality ◽  
Block Design ◽  
Short Fiber ◽  
Consistency Index ◽  
Fiber Analysis ◽  
Randomized Block Design ◽  
Fiber Fineness ◽  
Positive Effect

In this study carried out in 2015 under conditions of Kahramanmaraş province of Turkey, it was aimed at determining the effects of sawgin and rollergin methods on fiber quality in some cotton (Gossypium hirsutum L.) cultivars. In the study varieties of Lydia, Carisma, PG 2018, Flash, BA 440, BA 119 Maraş-92 and Erşan-92 were used as experimental materials. The trial was established according to factorial randomized block design with four replications. Seed cottons obtained from the trial were ginned in the rollergin and sawgin machines. In the obtained lint cotton samples, a number of fiber characteristics were determined by using HVI and AFIS fiber analysis devices. Ginnig outturn (38.6%), fiber length (30.21 mm), uniformity index (86.02%), fiber strength (31.76 g tex-1), spinning consistency index (SCI) (104.68) determined by using rollergin system were found higher than ones determined by using sawgin system (respectivelly 37.2%, 29.78 mm, 84.61%, 30.97 g tex-1, 94.50). Short fiber index (3.47%) and nep count (59.40 number g-1) obtained from rollergin system were found lower than ones obtained from sawgin system (respectivelly 4.38% and 119.34 number g-1). As a result it can be said that the rollergin method has positive effect on ginnig outturn, fiber length, uniformity index, fiber strength, spinning consistency index, short fiber index and nep count. When fiber length, fiber strength, spinning consistency index, nep size are considered together the best variety was Lydia cv. (respectivelly 30.87 mm, 32.56 g tex-1, 104.25, 675.63 μm). Ginning outturn, uniformity index, short fiber index, total particule number, dust particule number and trash count are considered together the best variety was Erşan-92 cv. (respectivelly 39.4%, 86.02%, 3.48%, 231.4 number g-1, 206.3 number g-1, 25.13 number g-1). For fiber fineness the best varieties were BA 119 and Maraş-92 cv. (respectivelly 4.78 mic. and 4.80 mic.).

scholarly journals Quantification of Avoidable Yield Losses in Oilseed Brassica Caused by Insect Pests

2011 ◽  
Vol 51 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Jagdev Kular ◽  
Sarwan Kumar
Keyword(s):  
Seed Yield ◽  
Yield Loss ◽  
Insect Pests ◽  
Block Design ◽  
Maximum Yield ◽  
The Other ◽  
Yield Losses ◽  
Eruca Sativa ◽  
Mustard Aphid ◽  
Randomized Block Design

Quantification of Avoidable Yield Losses in OilseedBrassicaCaused by Insect PestsA six year field study was conducted from 2001-2002 to 2006-2007 at Punjab Agricultural University, Ludhiana, India to study the losses in seed yield of differentBrassicaspecies (B. juncea, B. napus, B. carinata, B. rapaandEruca sativa) by the infestation of insect pests. The experiment was conducted in two different sets viz. protected/sprayed and unprotected, in a randomized block design, with three replications. Data on the infestation of insect pests, and seed yield were recorded at weekly intervals and at harvest, respectively. The loss in seed yield, due to mustard aphid and cabbage caterpillar, varied from 6.5 to 26.4 per cent.E. sativasuffered the least loss in seed yield and harboured the minimum population of mustard aphid (2.1 aphids/plant) and cabbage caterpillar (2.4 larvae/plant). On the other hand,B. carinatawas highly susceptible to the cabbage caterpillar (26.2 larvae/plant) and suffered the maximum yield loss (26.4%).

Discriminant analysis-based modeling of cotton fiber and yarn properties

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Baneswar Sarker ◽  
Shankar Chakraborty
Keyword(s):  
Discriminant Analysis ◽  
Physical Properties ◽  
Cotton Fiber ◽  
Fiber Strength ◽  
Natural Fibers ◽  
Content Type ◽  
Fiber Properties ◽  
Yarn Properties ◽  
Fiber Fineness ◽  
Genetic And Environmental Factors

Purpose Like all other natural fibers, the physical properties of cotton also vary owing to changes in the related genetic and environmental factors, which ultimately affect both the mechanics involved in yarn spinning and the quality of the yarn produced. However, information is lacking about the degree of influence that those properties impart on the spinnability of cotton fiber and the strength of the final yarn. This paper aims to discuss this issue. Design/methodology/approach This paper proposes the application of discriminant analysis as a multivariate regression tool to develop the causal relationships between six cotton fiber properties, i.e. fiber strength (FS), fiber fineness (FF), upper half mean length (UHML), uniformity index (UI), reflectance degree and yellowness and spinning consistency index (SCI) and yarn strength (YS) along with the determination of the respective contributive roles of those fiber properties on the considered dependent variables. Findings Based on the developed discriminant function, it can be revealed that FS, UI, FF and reflectance degree are responsible for higher YS. On the other hand, with increasing values of UHML and fiber yellowness, YS would tend to decrease. Similarly, SCI would increase with higher values of FS, UHML, UI and reflectance degree, and its value would decrease with increasing FF and yellowness. Originality/value The discriminant functions can effectively envisage the contributive role of each of the considered cotton fiber properties on SCI and YS. The discriminant analysis can also be adopted as an efficient tool for investigating the effects of various physical properties of other natural fibers on the corresponding yarn characteristics.

scholarly journals Effectiveness of Biopesticide Derived fromCassia spectabilis and Nicotiana tabacum Leaves Against the Main Insect Pests of Coffee and Its Effect On Other Arthropods

2006 ◽  
Vol 22 (1) ◽  
Author(s):  
Soekadar Wiryadiputra
Keyword(s):  
Nicotiana Tabacum ◽  
Insect Pests ◽  
Block Design ◽  
Monthly Interval ◽  
Planococcus Citri ◽  
Hypothenemus Hampei ◽  
Botanical Pesticide ◽  
Cassia Spectabilis ◽  
Negative Effect ◽  
Mealy Bug

An experiment on the effectiveness of biopesticide made of ramayana (Cassia spectabilis) and tobacco leaves (Nicotiana tabacum) it called as Casnic, on Hypothenemus hampeiand Planococcus citriand its effect on the arthropods population fauna in coffee plantation had been conducted in Pest Laboratory of Indonesian Coffee and Cocoa Researh Institute and Bangelan Plantation in Malang. The treatment consisted of three level concentrations of botanical pesticide(15 ml, 30 ml, and 60 ml/lof water), Beauveria bassiana(at a dose 100 g spore per ha), metidation spraying (2 ml formulation per litre of water) and two control treatments (with and without soap). The field experiment was arranged in randomized complete block design (RCBD) with four replications. The results showed that botanical pesticide at the concentration of 30.0 ml stock solution per litre of water and applied four times with monthly interval was effective in controlling coffee berry borer (Hypothenemus hampei) and coffee mealy bug (Planococcus citri). The effectiveness was not significantly different compared to metidation and Beauveria bassianaat the dose of 0.8 l and 100 g formulation per ha per application. Application of the botanical pesticide did not show negative effect on the usefull predatory insects and other arthropods population in coffee ecosystem. Key words : Botanical pesticide, Cassia spectabilis, Nicotiana tabacum, Coffee, Hypothenemus hampei, Planococcus citri, Arthropods.

scholarly journals Phenotypic adaptability of cotton genotypes to the brazilian cerrado for yield and fiber quality

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Mayara Fávero Cotrim ◽  
Francisco José Correa Farias ◽  
Luiz Paulo de Carvalho ◽  
Larissa Pereira Ribeiro Teodoro ◽  
Carlos Antonio da Silva Junior ◽  
...  
Keyword(s):  
Fiber Length ◽  
Fiber Strength ◽  
Fiber Quality ◽  
Block Design ◽  
Brazilian Cerrado ◽  
Gxe Interaction ◽  
Randomized Block Design ◽  
Cotton Genotypes ◽  
High Predictability ◽  
Fiber Traits

Studies on the adaptability and stability are fundamental for plant breeding as they are an alternative to reduce the effects of genotypes x environments interaction (GxE). Moreover, they help identify cultivars with predictable behavior, which are responsive to environmental improvements, subsidizing cultivar recommendation. This study aimed to investigate the genotypes x environments interaction in cotton genotypes grown in the Brazilian Cerrado and identify genotypes for favorable and unfavorable environments. During the 2013/2014 and 2014/2015 seasons, 19 competition trials were carried out with cotton in a randomized block design, with 12 treatments, and four replications. The traits cotton seed yield, fiber percentage, fiber length, and fiber strength were evaluated. Results revealed significant GxE interaction for all the fiber traits evaluated. Genotype BRS 369 RF revealed general adaptability and high predictability for the fiber traits evaluated.

scholarly journals Estimation of Genetic Effects Controlling Different Plant Traits in Cotton (Gossypium Hirsutum L.) Under Clcuv Epidemic Condition

2017 ◽  
Vol 50 (1) ◽  
pp. 47-56 ◽  
Author(s):  
A.M. Khan ◽  
S. Fiaz ◽  
I. Bashir ◽  
S. Ali ◽  
M. Afzal ◽  
...  
Keyword(s):  
Plant Traits ◽  
Fiber Strength ◽  
Block Design ◽  
Cotton Leaf ◽  
Cotton Leaf Curl Virus ◽  
Fiber Fineness ◽  
Cotton Genotypes ◽  
Seed Index ◽  
Leaf Curl Virus ◽  
Additive Genes

Abstract Nine cotton genotypes, comprised of four non Bt males (CIM-1100, CIM-506, FH-942 and FH-900), five Bt female genotypes (FH-113, FH-114, MNH- 886, AA-703 and IR-3701) and their 20 crosses were screened in order to evaluate their response to Cotton leaf curl virus symptoms through epidemiology in the field and greenhouse. The 20 crosses among their nine parents were sown in two replications under randomized complete block design, during 2013 and 2014. The mean squares were significant for all traits indicating that both additive and non-additive genes control the characters, but non-additive genes were more important because, variance of dominant genes were higher than additive genes. In our test, FH-900 showed the best performance against CLCuV, number of lobes per boll and seed yield. The CIM- 1100 genotype performed well in boll weight, fiber strength and fiber fineness, whereas CIM-506 was good for plant height, number of sympodial branches and ginning. Maximum boll number, seed index and fiber length were shown by FH-942. Among lines, MNH886, FH-113, IR-3701 and FH-114 exhibited the best general combination for many traits. Hence, parents were preferred for hybridization program to improve the majority of characters. Hybrids FH-113 × FH-942, MNH-886 × CIM-1100, MNH-886 × FH-942, IR-3701 × CIM-506, AA-703 × CIM-1100, FH-114 × FH-942, FH-114 × CIM-1100 and MNH-886 × FH- 900 was best in specific combinations for different traits, especially against CLCuV. The results indicated that to increase resistance against CLCuV, hybrids should be exploited to develop CLCuV resistance.

scholarly journals APLIKASI PUPUK DAN MULSA JERAMI PADA TANAMAN KEDELAI TERHADAP SERANGAN HAMA DAN PRODUKSI

EUGENIA ◽  
2015 ◽  
Vol 21 (1) ◽  
Author(s):  
J. Rimbing ◽  
J. Pelealu ◽  
D. Sualang
Keyword(s):  
Insect Pests ◽  
Block Design ◽  
Insect Pest ◽  
Inorganic Fertilizer ◽  
Flying Insects ◽  
Randomized Block Design ◽  
Soybean Pest ◽  
Crop Damages ◽  
Virus Attack ◽  
Soybean Plants

ABSTRACT   The research was arranged in a randomized block design (RBD), with 10 treatments and 3 replications. To get the active insects pests, net sweepings were done for the flying insects, while other pests were observed directly on the plants. Collecting data of plant damages were made by systematic diagonal lines, except for viruses, census was conducted on each experimental plot.  The results of this experiment documented 12 species of insect pests attacking soybean plants. Soybean pest populations were relatively low, except for Aphis glycine that was quite high. In all treatments, plant damage caused by sucking pest Piezodorus sp and Riptortus linearis were relatively low of 1.53 % to 1.94 %; it indicated an insignificant effect to decline the production. Crop damages by virus showed a significant effect. The lowest virus attacks found on compost of 5 tons per ha with 43 plants infected per treatment, the highest virus attack showed on combination of 5 tons compost per ha + inorganic fertilizer + mulch, in which there were 274 infected plants per treatment. Apparently virus attacks gave impact on soybean production. The highest production were documented on treatment of 5 tons compost per ha with production of 0.55 tons per ha, while the lowest production was found on combination of 5 tons compost per ha + inorganic fertilizer + mulch, in which the production was 0.22 tons per ha. Keywords:  fertilizer, mulch, insect pest, production

Influence of Cotton Fiber Strength and Fineness on Fiber Damage during Lint Cleaning

1988 ◽  
Vol 58 (8) ◽  
pp. 433-438 ◽  
Author(s):  
J. K. Dever ◽  
J. R. Gannaway ◽  
R. V. Baker
Keyword(s):  
Significant Relationship ◽  
Cotton Fiber ◽  
Fiber Length ◽  
Fiber Strength ◽  
Fiber Breakage ◽  
Fiber Damage ◽  
Fiber Properties ◽  
Fiber Fineness ◽  
Wide Range ◽  
Induced Changes

Seven sources of cotton representing a wide range of fiber properties were roller ginned, saw ginned, or saw ginned plus processed through tandem saw lint cleaners or through an aggressive carding-type cleaner (Cottonmaster1). Lint cleaner induced changes in fiber length and nep count were compared to fiber property measurements from roller ginned samples. Fiber length deterioration from saw ginning was negatively correlated with fiber strength. Fiber breakage in lint cleaning was positively correlated with fiber fineness. Resistance to fiber length damage in ginning was explained best by fiber strength and fineness, or an estimate of individual fiber strength. Initial and final nep level were related to fineness, nonlint content, and upper quartile length, but an increase in neps due to lint cleaning had no significant relationship to fiber properties.

scholarly journals KETAHANAN BEBERAPA AKSESI KAPAS TERHADAP HAMA PENGISAP DAUN Amrasca biguttula (ISHIDA)

2020 ◽  
Vol 13 (3) ◽  
pp. 81
Author(s):  
I G.A.A. INDRAYANI ◽  
SIWI SUMARTINI ◽  
B. HELIYANTO B. HELIYANTO
Keyword(s):  
Gossypium Hirsutum ◽  
Chemical Control ◽  
Block Design ◽  
Insect Pest ◽  
Resistant Variety ◽  
Plant Spacing ◽  
Experimental Station ◽  
Randomized Block Design ◽  
Mental Problems ◽  
Moderately Resistant

ABSTRAK<br />Amrasca biguttula (Ishida) adalah serangga hama pengisap daun<br />yang sangat potensial menurunkan produktivitas kapas. Pengendaliannya<br />secara kimiawi menimbulkan banyak masalah lingkungan, seperti<br />pencemaran dan peningkatan resistensi hama terhadap insektisida kimia<br />sintetis. Salah satu solusi dalam masalah tersebut adalah penggunaan<br />varietas tahan (resisten) yang juga merupakan bagian dari pengendalian<br />hama terpadu (PHT) pada kapas. Penelitian ketahanan beberapa aksesi<br />kapas terhadap A. biguttula (Ishida) dilakukan di Kebun Percobaan Balai<br />Penelitian Tanaman Tembakau dan Serat di Asembagus, Situbondo, mulai<br />Januari hingga Desember 2006. Tujuannya adalah untuk mengetahui<br />ketahanan beberapa aksesi kapas terhadap serangan hama pengisap daun,<br />A. biguttula. Sebagai perlakuan adalah 30 aksesi kapas yang ditanam<br />dalam plot berukuran 10 m x 3 m, dengan jarak tanam 100 cm x 25 cm,<br />satu tanaman per lobang. Setiap aksesi disusun dalam rancangan acak<br />kelompok dengan tiga kali ulangan. Parameter yang diamati adalah jumlah<br />nimfa A. biguttula per daun, jumlah bulu daun per cm 2 luas daun, dan<br />posisi bulu terhadap lamina (tegak/rebah), serta skor kerusakan tanaman.<br />Hasil penelitian menunjukkan bahwa setiap aksesi kapas berpotensi<br />terserang A. biguttula, meskipun tingkat populasi hama ini tidak<br />menunjukkan perbedaan nyata antar aksesi. Terjadi korelasi negatif (R 2 =<br />0,2425) antara jumlah bulu daun dan populasi nimfa A. biguttula dan<br />antara jumlah bulu daun dan skor kerusakan tanaman (R 2 = 0,2027).<br />Berdasarkan jumlah bulu daun, aksesi kapas yang termasuk kategori<br />sedikit berbulu dengan kriteria ketahanan sedikit tahan adalah: AC 134,<br />Stoneville 7, Fai Nai, SHR, CRDI-1, Kanesia 5, Kanesia 8, dan Kanesia 9.<br />Sedangkan aksesi lainnya termasuk kategori tidak berbulu dan peka<br />terhadap serangan A. biguttula.<br />Kata kunci : Kapas, Gossypium hirsutum, aksesi, hama, Amrasca<br />biguttula (Ishida), toleran, peka, kerusakan, Jawa Timur<br />ABSTRACT<br />Resistance of several cotton accessions to sucking insect<br />pest, Amrasca biguttula (Ishida)<br />Amrasca biguttula (Ishida) is a sucking insect pest which potentially<br />reduces cotton productivity. Its chemical control often cause environ-<br />mental problems mainly air pollution and increase of pest resistance to<br />certain chemical insecticides. One solution can be used to solve these<br />problems is by using resistant variety that is also an integral part of the<br />integrated pest management (IPM). Study on the resistance of several<br />cotton accessions to sucking insect pest, Amrasca biguttula (Ishida) was<br />conducted at the Experimental Station of the Indonesian Tobacco and<br />Fiber Crops Research Institute (IToFCRI) in Asembagus, Situbondo, East<br />Java, from January to December 2006. The objective of the study was to<br />find out the resistance of cotton accessions to sucking insect pest. Thirty<br />accessions of cotton were used as treatment and were planted in plots 10 m<br />x 3 m with plant spacing 100 cm x 25 cm, one plant per hole. Each<br />accession was arranged in a randomized block design with three<br />replications. Parameters observed were number of nymph of A. biguttula,<br />number of leaf hair, leaf hairs position (erect or lie down), and score of<br />damage. The result showed that every accession of cotton can be attacked<br />by A. biguttula although the insect population was not significantly<br />different among accessions. There is negative correlation (R 2 = 0.2425)<br />between number of leaf hair and population of A. biguttula and between<br />number of leaf hair and score of plant damage (R 2 = 0.2027). Accessions<br />that categorized as lightly hairy and moderately resistant to A. biguttula<br />were AC 134, Stoneville 7, Fai Nai, SHR, CRDI-1, Kanesia 5, Kanesia 8,<br />and Kanesia 9, while the others were categorized as glabrous and<br />susceptible to the sucking pest.<br />Key words: Cotton, Gossypium hirsutum, accession, insect pest, Amrasca<br />biguttula (Ishida), tolerant, sensitive, damage, East Jav

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