scholarly journals Efektivitas Atraktan terhadap Daya Tetas dan Jumlah Telur Nyamuk Aedes albopictus di Laboratorium

2019 ◽  
Vol 11 (2) ◽  
pp. 99-106
Author(s):  
Muhammad Rasyid Ridha ◽  
Abdullah Fadilly ◽  
Budi Hairani ◽  
Wulan RSG Sembiring ◽  
Gusti Meliyanie
Keyword(s):  
Aedes Albopictus ◽  
Gravid Female ◽  
Hemorrhagic Fever ◽  
Imperata Cylindrica ◽  
Eleusine Indica ◽  
Surrounding Environment ◽  
Randomized Design ◽  
Kolmogorov Smirnov ◽  
Completely Randomized Design ◽  
Smirnov Test

Abstract. Aedes albopictus can act as a primary or secondary vector of dengue hemorrhagic fever andchikungunya. Its population needs to be controlled. One of the environmentally-friendly control methods isthe use of ovitrap. Ovitrap will be more optimal if it added by attractant substances from easily obtainedingredients in the surrounding environment. This study aims to determine the effectiveness of attractants inthe form of water-soaked paddy (Oryza sativa), cogongrass (Imperata cylindrica) and Indian goosegrass(Eleusine indica). An experimental study with a completely randomized design (CRD) was carried out at theEntomology Laboratory of Balai Litbangkes Tanah Bumbu in January - April 2018. The population of thisstudy is the 10th filial of Ae. albopictus laboratory colonization and gravid female mosquito as samples.Material combination in the study was paddy straw soaking water (ARJP), Indian goosegrass immersionwater, cogongrass soaking water, Ae albopictus used eggs laying water (ABT), and distilled water as control(K). Repetition was done five times. Effectiveness of attractants analyzed by ANOVA and LSD tests. Datanormality tested by Kolmogorov-Smirnov test, if it was not fulfilled, the Kruskal Wallis test was used. Theresults showed that the use of attractants of water-soaked paddy, Indian goosegrass and cogongrass provedto have a different effect on the number of Aedes albopictus mosquito eggs compared to aquades and eggslaying water, but there was no influence between the three types of attractants.

scholarly journals Dengue vector surveillance (Aedes albopictus) with ovitrap and attractants from imperata immersion (Imperata cylindrica)

2020 ◽  
Vol 9 (4) ◽  
pp. 286
Author(s):  
M. Rasyid Ridha ◽  
Budi Hairani ◽  
Akhmad Rosanji ◽  
Abdullah Fadilly ◽  
Gusti Meliyanie
Keyword(s):  
Aedes Albopictus ◽  
Imperata Cylindrica ◽  
Laboratory Research ◽  
Dengue Vector ◽  
Vector Surveillance ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Research Type ◽  
True Experiment

Efforts to control the vector in reducing the population of Aedes albopictus can be done by using attractants with ovitrap. This study aims to determine the variation of Imperata cylindrica raeusch's immersion straw immersion dose on the number of eggs and hatchability of Aedes albopictus in the laboratory. Research type is a true experiment with a completely randomized design (CRD). The material used is Imperata cylindrica raeusch soaking with 5%, 10%, 15%, 20% concentration and aquadest as a control with 5 replications. The results showed that Imperata grass soaking was proven to be effective as an attractant in Aedes albopictus mosquitoes and was able to inhibit the number of eggs that hatch. Utilization of Imperata straw soaking can be used as an additive in the ovitrap in dengue vector surveillance.

scholarly journals EFEKTIFITAS CAMPURAN RENDAMAN JERAMI (ORYZA SATIVA L) DAN TEMEFOS SEBAGAI ATRAKTAN TERHADAP LETHAL OVITRAP AEDES AEGYPTI L

2020 ◽  
Vol 19 (2) ◽  
pp. 112-118
Author(s):  
Muhammad Rasyid Ridha ◽  
Budi Hairani ◽  
Gusti Meliyanie ◽  
Wulan Rasna Giri Sembiring ◽  
Abdullah Fadilly ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Dengue Hemorrhagic Fever ◽  
Control Strategy ◽  
Oryza Sativa L ◽  
Larval Mortality ◽  
Hemorrhagic Fever ◽  
Alternative Control ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Global Health Problem

ABSTRACT Dengue hemorrhagic fever is a global health problem and can be transmitted through vectors, namely Aedes aegypti. One of the controls can be through lethal ovitrap combined with attractant. This study aims to compare the percentage of trapped eggs, the number of eggs hatched, and larval mortality in the lethal ovitrap that were given two additional types of attractants. The insecticides used were temephos, while the attractants used were 20% straw soaking water, and water that Ae. aegypti have used to lay eggs. The type of research is an experiment with a completely randomized design. The sample used was female mosquito of Ae. aegypti that is full of blood from laboratory colonization. The results showed that straw soaking water was more influential attractant than the former Ae. aegypti colonization water in attracting Ae. aegypti mosquitoes to lay eggs. The highest larval mortality was found in a combination of lethal ovitrap with straw soaking water. Statistically there is an influence of the type of attractant on hatchability and the development of Ae. aegypti into adult mosquitoes. The combination of lethal ovitrap and attractant of straw soaking water can be an alternative control strategy for DHF program managers to reduce the density of Ae. aegypti mosquitoes and minimize transmission of dengue hemorrhagic fever in an area. Keywords: Aedes aegypti, attractant, lethal ovitrap, straw soaking water   ABSTRAK Demam berdarah dengue merupakan masalah kesehatan global dan dapat ditularkan melalui vektor yaitu Aedes aegypti. Salah satu pengendaliannya dapat melalui lethal ovitrap yang dipadukan dengan atraktan. Penelitian ini bertujuan untuk membandingkan persentase jumlah telur terperangkap, jumlah telur menetas, dan mortalitas larva pada lethal ovitrap yang diberi tambahan dua jenis atraktan. Insektisida yang digunakan adalah temefos, sedangkan atraktan yang digunakan adalah air rendaman jerami dengan konsentrasi 20%, dan air bekas kolonisasi/telur larva Ae. aegypti. Jenis penelitian ini adalah eksperimen dengan rancangan acak lengkap. Sampel yang digunakan adalah nyamuk Ae. aegypti betina yang kenyang darah hasil kolonisasi di laboratorium. Hasil penelitian menunjukkan bahwa air rendaman jerami merupakan atraktan yang lebih berpengaruh dibandingkan air bekas kolonisasi Ae. aegypti dalam menarik nyamuk Ae. aegypti untuk bertelur. Mortalitas larva tertinggi terdapat pada kombinasi lethal ovitrap dengan air rendaman jerami. Secara statistik ada pengaruh jenis atraktan terhadap daya tetas dan perkembangan Ae. aegypti menjadi nyamuk dewasa. Kombinasi lethal ovitrap dengan atraktan air rendaman jerami dapat menjadi strategi pengendalian alternatif bagi pengelola program DBD untuk mengurangi kepadatan nyamuk Ae. aegypti dan meminimalisasi transmisi penyakit demam berdarah dengue di suatu wilayah. Kata kunci: Aedes aegypti, atraktan, lethal ovitrap, rendaman jerami

scholarly journals Influence of the sowing depth and amount of sugarcane straw on the emergence of Chloris polydactyla and Eleusine indica and their control by herbicides applied pre-emergence

2017 ◽  
Vol 38 (3) ◽  
pp. 1187
Author(s):  
Marcelo Rafael Malardo ◽  
Patrícia Andrea Monquero ◽  
Paulo Henrique Vieira dos Santos ◽  
Nagilla Moraes Ribeiro ◽  
Paulo Vinicius da Silva ◽  
...  
Keyword(s):  
Rainfall Regime ◽  
Herbicide Application ◽  
Dry Period ◽  
Sowing Depth ◽  
Eleusine Indica ◽  
Sugarcane Straw ◽  
Randomized Design ◽  
Emergence Percentage ◽  
Completely Randomized Design ◽  
Rainfall Regimes

The objective of this study was to evaluate the effect of the sowing depth and amount of sugarcane straw on the soil on the emergence of Chloris polydactyla (‘capim-branco’) and Eleusine indica (Indian goosegrass) and to determine the efficacy of herbicides applied pre-emergence in the control of these species under different straw amount and rainfall regime conditions. The experiments were conducted in a completely randomized design with four replications. In the first experiment, the effects of six sowing depths (0.5, 1, 2, 4, 8, and 10 cm) and six sugarcane straw amounts (0, 1, 2, 4, 8 and 10 t ha -1) were assessed on the emergence of Indian goosegrass and ‘capim-branco’ in a 6 x 6 factorial arrangement. In the second experiment, the efficacy in the control of these species was evaluated for one control without herbicide and five treatments (indaziflam, metribuzin, tebuthiuron, indaziflam + metribuzin, and indaziflam + tebuthiuron) applied pre-emergence over four straw amounts (0, 1, 2, and 4 t ha-1) in a 6 x 4 factorial arrangement. This experiment was evaluated under two rainfall regimes in separate experiments (simulation of 20 mm of rainfall 1 or 10 days after herbicide application). The ‘capim-branco’ showed a marked reduction in emergence beginning at 2 t ha-1 of straw and a 2 cm sowing depth. For the Indian goosegrass, the decline in emergence mainly occurred beginning at 4 t ha-1 of straw and a 4 cm sowing depth. Only some of the Indian goosegrass plants emerged at the greater sowing depths (8 and 10 cm) and straw amounts (8 and 10 t ha-1), whereas no emergence of the ‘capim-branco’ was observed under these conditions. The treatments with sowing at a 1 cm depth and with 0, 1, 2, and 4 t ha-1 of straw provided the highest emergence percentage for the species. Application of the herbicide indaziflam alone was the only ineffective treatment for the control of the weeds regardless of the amount of straw and the water regime used. We concluded that the increase in the sowing depth and the amount of straw significantly reduced the emergence of the species and that the presence of straw and the dry period interfered with the herbicide efficacy.

scholarly journals Isolasi dan Aplikasi Fungi Entomopatogen dari Larva Nyamuk Aedes aegypti L.

2019 ◽  
Vol 11 (2) ◽  
pp. 87-93
Author(s):  
Wuri Artikasari ◽  
Emantis Rosa ◽  
Bambang Irawan
Keyword(s):  
Aedes Aegypti ◽  
Entomopathogenic Fungi ◽  
Negative Impact ◽  
Hemorrhagic Fever ◽  
Mosquito Larvae ◽  
Chemical Insecticide ◽  
Randomized Design ◽  
Significant Difference ◽  
Completely Randomized Design ◽  
Difference Test

DHF (Dengue Hemorrhagic Fever) is a serious problem in Indonesia. DHF disease control has been applied so far, one of which is the use of larvacide temephos (abate). However larvacide is a chemical insecticide that has a negative impact on human health and causes resistance. Therefore in this research, biological control is carried out by utilizing entomopathogenic fungi as a larvacide. The purpose of this study was to determine the effectiveness of entomopathogenic fungi isolated from Ae aegypti larvae. Against the death of Ae. Aegypti mosquito larvae with the moist chamber method. This study used a completely randomized design (CRD) with a factorial pattern and performed two repetitions. Factor A is a type of fungi with 3 levels, namely A1: Aspergillus sp1, A2: Aspergillus sp2, and A3: Syncephalastrum sp. Factor B is a dilution with 7 levels, namely B0: Control, B1: 100 (without dilution), B2: 10-1, B3: 10-2, B4: 10-3, B5: 10-4, B6: 10-5 with every treatment was applied in 2 repetitions. Observations were made 24 hours after treatment for 3 days. Data were analyzed using analysis of variances (anova) and continued with the Least Significant Difference Test (LSD) at 5%. The results indicate that fungi isolates are the most effective in killing Ae. Aegypti mosquito larvae is Aspergillus sp1 and Aspergillus sp2 on the treatment of spores without dilution. Key words: DHF; larvacide; Aedes aegypti; Entomopathogenic Fungi.

scholarly journals Comparing Effectiveness of Hay Infusion and Sugar Fermentation Solution as Ovitrap's Attractans to Aedes aegypti

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Nastiti Widoretno
Keyword(s):  
Aedes Aegypti ◽  
Gravid Female ◽  
Hemorrhagic Fever ◽  
Mosquito Vector ◽  
Sugar Fermentation ◽  
Randomized Design ◽  
Experimental Laboratory ◽  
The Difference ◽  
Gravid Mosquitoes ◽  
Fermentation Solution

Dengue Hemorrhagic Fever (DHF) is still one of the major public health problems in the world and Indonesia. There are several methods of mosquito vector control, one of them is the use of ovitrap and the addition of attractants which is a compound that may attract gravid mosquitoes to lay eggs. Some examples of attractants are hay infusion and sugar fermentation solution. This research aimed to compare effectiveness of hay infusion  and sugar fermentation solution as Aedes aegypti attractants. This research type was true experimental laboratory with complete randomized design which is divided into 3 groups of ovitrap containing aquades as control, 20% hay infusion and 20% sugar fermentation solution. Ovitraps with those attractants were put into a mosquito coop containing 25 gravid female mosquitoes. Mosquito’s eggs counting was done after 2 days with 9 times repetition. The data were then analyzed using Kruskal-Wallis and Mann-Whitney test. It was found that the difference of mosquito’s eggs number in the ovitrap containing the fermentation solution of sugar and hay infusion had a significance value of 0.000 (p> 0,05). It means that hay infusion is more effective compared with sugar fermentation. Keywords                   : DHF, ovitrap, attractant, hay infusion, sugar fermentation solution

scholarly journals EFEKTIVITAS ABATE DAN EKSTRAK DAUN SIRIH (Piper betle) DALAM MEMATIKAN LARVA Aedes Aegypti L INSTAR III

Masker Medika ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 226-232
Author(s):  
Triana Oktaviani ◽  
Zairinayati Zairinayati
Keyword(s):  
Aedes Aegypti ◽  
Leaf Extract ◽  
Hemorrhagic Fever ◽  
Piper Betle ◽  
Mosquito Larvae ◽  
Betel Leaf ◽  
Preventive Effort ◽  
Randomized Design ◽  
Natural Insecticides ◽  
Completely Randomized Design

Latar Belakang: Aedes aegypti merupakan nyamuk yang dapat berperan sebagai vektor Demam Berdarah Dengue (DBD). Upaya promotif dan preventif menjadi mutlak dilakukan untuk memutus mata rantai penularan dengan membunuh larva nyamuk dengan larvasida alami menggunakan ekstrak daun sirih (Piper betle) sebagai insektisida alami. Tujuan dari penelitian: ini adalah untuk mengetahui perbedaan abate dan ekstrak daun sirih (Piper betle) dalam mematikan larva Aedes aegypti L instar III. Desain penelitian: ini bersifat eksperimen dengan menggunakan rancangan acak lengkap (RAL) yang terdiri dari 3 perlakuan 1 kontrol dan 8 kali pengulangan percobaan. Hasil Penelitian: dapat diketahui bahwa untuk penggunaan ekstrak daun sirih (Piper betle) dengan konsentrasi 5% dapat mematikan larva sebanyak 8 ekor, sedangkan konsentrasi 10% tidak dapat mematikan larva (0 larva) dan konsentrasi 15% dapat mematikan larva sebanyak 17 (85%) sedangkan untuk penggunaan abate dengan konsentrasi 5%, 10% dan 15% dapat mematikan larva sebanyak 160 larva (100%). Kesimpulan: bahwa abate mempunyai efektifitas lebih tinggi di banding dengan ekstrak daun sirh (Piper betle).     Background: Aedes aegypti is a mosquito that can act as a vector of dengue Hemorrhagic Fever (DHF). Promotove and preventive effort are absolutely necessary to break the chain to transmission by killing mosquito larvae with natural larvacides using betel leaf extract (Piper betle) as a natural insecticides. The purposes of this study: this was to determine the differences in abate and betel leaf extract (Piper batle) in kliing Aedes aegypti instar III larvae. Research methods this is an experimental study using a completely randomized design (CRD) consisting of 3 treatments 1 control and 8 repetitions of the experiment. The results: it can be seen that for the use of betel leaf extract(Piper betle) with a concentration cannot kill larvae in 17 (85%) whilke for the use of abate with a concentration of 5%, 10% and 15% can kill larvae of 160 (100%). Conclusion: that the abate has a higher effectiveness compared to sirih leaf extract.

scholarly journals Uji Efektivitas Campuran Herbisida Berbahan Aktif Atrazin dan Topramezon terhadap Beberapa Jenis Gulma

2021 ◽  
Vol 20 (2) ◽  
pp. 93
Author(s):  
Dad Resiworo Jekti Sembodo ◽  
Nana Ratna Wati
Keyword(s):  
Survival Model ◽  
Active Ingredients ◽  
Ageratum Conyzoides ◽  
Eleusine Indica ◽  
Randomized Design ◽  
Herbicide Mixture ◽  
Herbicide Atrazine ◽  
Completely Randomized Design ◽  
Ld50 Value ◽  
Synedrella Nodiflora

The purpose of this study was to determine the effectiveness of mixing herbicides with the active ingredients atrazine and topramezone in controlling weeds and to determine the nature of the mixture of the two active ingredients. This research was conducted in a plastic house in Natar District, South Lampung Regency from October 2020 - January 2021. The study was arranged in a Completely Randomized Design (CRD). The treatments consisted of three types of herbicides with six dosage levels of the active ingredients, namely the single herbicide Atrazine 300 g/l (0, 37.5, 75, 150, 300, and 600 g ai ha-1), Topramezon 10 g/l (0. 1.25 , 2.5, 5, 10, and 20 g ai ha-1), and the herbicide mixture of Atrazine 300 g/l + Topramezone 10 g/l (0. 38.75, 77.50, 155, 310, and 620 g ai ha-1) , and repeated 6 times. The target weeds included broadleaf weeds (Ageratum conyzoides and Synedrella nodiflora), grass groups (Digitaria ciliaris, Echinochloa colonum, and Eleusine indica), and the puzzle group (Cyperus iria). The herbicides atrazine and topramezone have different ways of working so that the analytical method used is the Multiplicative Survival Model (MSM) method. The results showed that mixing the herbicide Atrazine 300 g/l + Topramezon 10 g/l had an expected LD50 value of 46.28 g ai ha-1 and a treatment LD50 of 27.22 g ai ha-1 with a co-toxicity value of 1.7 (Co-toxicity > 1) so that it is synergistic.Key words: Atrazin, Topramezon, mixing herbicide, Multiplicative Survival Model, weed, LD50

scholarly journals Competitive ability of corn in coexistence with goosegrass

2013 ◽  
Vol 31 (2) ◽  
pp. 281-289 ◽  
Author(s):  
A.C.D. Wandscheer ◽  
M.A. Rizzardi ◽  
M. Reichert
Keyword(s):  
Plant Height ◽  
Competitive Ability ◽  
Dry Mass ◽  
Agricultural Systems ◽  
Weed Species ◽  
Replacement Series ◽  
Eleusine Indica ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Corn Plants

Competition between plants is one of the main interferences that occurs in agricultural systems and accounts for significant crop yield reductions. The aim of this study was to assess the competitive ability of corn in coexistence with the weed species Eleusine indica. The experiments were conducted in a greenhouse, in the growing season 2010/2011, and were arranged in a completely randomized design with four replications. The experimental units consisted of plastic pots with a volumetric capacity of 8 L. Treatments were arranged in a replacement series with five proportions of corn plants and weed: 100:0, 75:25, 50:50, 25:75, and 0:100, respectively, with a constant population of eight plants per pot, at the end of each treatment. The competitiveness analysis was conducted through diagrams applied to the replacement series experiment and competitiveness index, and the variables evaluated were root, shoot, and total dry mass, and plant height. When in equal proportions, corn showed competitive ability equivalent to goosegrass in relation to the variables shoot, root, and total dry mass. Goosegrass was more competitive than the crop in relation to plant height.

scholarly journals PENGARUH KONSENTRASI ETANOL TERHADAP AKTIVITAS ANTIOKSIDAN EKSTRAK RIMPANG ILALANG (Imperata cylindrica (L) Beauv.) PADA EKSTRAKSI MENGGUNAKAN GELOMBANG ULTRASONIK

2019 ◽  
Vol 8 (1) ◽  
pp. 27
Author(s):  
Corry Permatasari Suhendra ◽  
I Wayan Rai Widarta ◽  
Anak Agung Istri Sri Wiadnyani
Keyword(s):  
Antioxidant Activity ◽  
Gallic Acid ◽  
Ultrasonic Wave ◽  
Design Method ◽  
Imperata Cylindrica ◽  
Total Phenolic ◽  
Randomized Design ◽  
Ic50 Value ◽  
Completely Randomized Design ◽  
Gallic Acid Equivalent

This research porpose to determine the appropiate concentration of ethanol to obtain the highest antioxidant activity of cogon grass rhizome (Imperata cylindrica (Linn.) Beuv.) extract using ultrasonic wave. This research used a completely randomized design method with the treatment of concentration ethanol which consisted of six levels : 40, 50, 60,70, 80 and 90%. The whole treatment was repeated three times to obtain 18 units of the experiment. The data were analyzed by ANOVA, if the treatment showed the influenced then it continued by Duncan test. The result showed that the best treatment is using ethanol 70% with characteristic extract : yield was 14.13%, total phenolic was 129.57 mgGAE (Gallic Acid Equivalent)/g extract, total flavonoid was 90.91 mgQE (Quercetin Equivalent)/g extract and antioxidant activity was 56.03% with the IC50 value 0.098 mg/ml

scholarly journals EMERGÊNCIA DE PLANTAS DANINHAS EM FUNÇÃO DA POSIÇÃO DA SEMENTE E QUANTIDADE DE PALHA DE CANA-DE-AÇÚCAR

2011 ◽  
Vol 12 (2) ◽  
Author(s):  
Micheli Satomi YAMAUTI ◽  
Arthur Arrobas Martins BARROSO ◽  
Paulo Roberto Fidelis GIANCOTTI ◽  
Vanessa Luzia SQUASSONI ◽  
Lucas Tadeu Mazza REVOLTI ◽  
...  
Keyword(s):  
Dry Mass ◽  
Variance Analysis ◽  
Initial Development ◽  
Eleusine Indica ◽  
Sugarcane Straw ◽  
Randomized Design ◽  
Additional Control ◽  
Seed Position ◽  
Emergence Percentage ◽  
Completely Randomized Design

O objetivo do trabalho foi avaliar os efeitos de diferentes densidades de palha de cana-de-açúcar e do posicionamento das sementes de Euphorbia heterophylla, Mucuna cinereum, Digitaria nuda e Eleusine indica sobre a emergência e o desenvolvimento inicial das plantas. O delineamento experimental utilizado foi o delineamento inteiramente casualizado, com 15 tratamentos e quatro repetições distribuídos em esquema fatorial 3 x 5 com testemunha adicional; o primeiro fator foi constituído pelas posições das sementes em relação a palha (abaixo, entre e sobre) e o segundo pelas quantidades de palha (1, 2, 4, 8 e 16 t ha -1) e a testemunha sem palha. Aos 15 dias após a semeadura (DAS) foram realizadas avaliações de altura, massa seca da parte aérea e porcentagem de emergência para E. heterophylla e M. cinereum e, aos 28 DAS, avaliações de massa seca da parte aérea e porcentagem de emergência para D. nuda e E. indica. Os dados obtidos foram submetidos ao teste F na análise de variância e as médias foram comparadas com o auxílio do teste de Tukey a 5% de probabilidade. Constatou-se que a emergência e o desenvolvimento inicial de E. heterophylla e M. cinereum foram reduzidos com o aumento da quantidade de palha e foram afetados com o posicionamento das sementes, mas não foram inibidos em nenhuma das condições, indicando uma maior agressividade destas daninhas em condições de colheita mecanizada. Já a emergência de espécies D. nuda e E. indica não sofreu interferência do posicionamento da semente e a cobertura do solo com 8 e 16 t ha -1 de palha de cana inibiu a emergência de suas plântulas.germinação. ABSTRACT This work was carried out to evaluate the effects of sugarcane straw density and positions of seeds of Euphorbia heterophylla, Mucuna cinereum, Digitaria nuda and Eleusine indica on emergence and initial development of plants. The experiment were arranged in a completely randomized design, with 15 treatments and four replications, in a factorial arrangement 3 x 5 with a additional control; the first factor was constituted by position of seeds related to the straw (under, between and on) and the second by five quantities of straw (1, 2, 4, 8 e 16 t ha -1) with a control without straw. At 15 days after sowing (DAS) it was realized evaluations of height, dry mass and emergence percentage for E. heterophylla and M. cinereum, and at 28 DAS it was analyzed dry mass and emergence percentage for D nuda e E. indica. Data obtained were submitted to F in variance analysis test and means were compared with Tukey at 5% probability. Emergence and initial development of E. heterophylla e M. cinereum were reduced with increasing of straw and were affected by seed position, but it was not inhibited in none of conditions, indicating aggressiveness of these weeds in sugarcane mechanized harvest conditions. D. nuda and E. indica emergence was not affected by seed position and coverage soil with 8 e 16 t ha -1 of sugarcane straw inhibited its emergence.

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