Atividade inseticida do extrato de nim sobre lagartas da Diatraea saccharalis (Fabricius, 1794) de primeiro instar da broca da cana-de-açúcar
The objective of this study was to evaluate the mortality of first instar larvae of the sugarcane borer Diatraea saccharalis (Lepidoptera: Crambidae). To effect finding newly hatched larvae were subjected to sheet feed sprayed with neem oil at four different concentrations (5%, 2.5%, 1% and 0.5% v /...
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Published in | Revista verde de agroecologia e desenvolvimento sustentável Vol. 7; no. 4 |
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Main Authors | , , |
Format | Journal Article |
Language | Portuguese English |
Published |
Grupo Verde de Agroecologia e Abelhas (GVAA)
01.12.2012
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Subjects | |
Online Access | Get full text |
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Summary: | The objective of this study was to evaluate the mortality of first instar larvae of the sugarcane borer Diatraea
saccharalis (Lepidoptera: Crambidae). To effect finding newly hatched larvae were subjected to sheet feed sprayed
with neem oil at four different concentrations (5%, 2.5%, 1% and 0.5% v / v. And control) were evaluated immediately
1, 2, 3, 5, 8, 13, 21 and 34 hours after infestation, recording mortality of the larvae. The statistical design was
completely randomized in a factorial 5 x 15 repetitions. The data collected were subjected to analysis of variance and
when significant by F test at 5% probability, it was efficiency analysis using the Abbott formula. Satisfactory control
percentages were achieved at 34 hours after infestation for the treatments with 5.0, 2.5 and 1.0% of the natural
insecticide, accounting controls, 97.94, 98.97 and 95.88% respectively. Thus the neem oil from 1.0% v / v. was
effective in controlling D. saccharalis, the configuration that the fog was produced and studied in laboratory conditions.
O objetivo deste trabalho foi avaliar a mortalidade de lagarta de primeiro instar da broca da cana Diatraea
saccharalis (Lepidoptera: Crambidae). Para constatação do efeito as larvas recém-eclodidas foram submetidas a
alimentação de folhas pulverizadas com óleo de nim em quatro concentrações diferentes (5%, 2,5%, 1% e 0,5% v/v. e
testemunha), sendo avaliadas imediatamente a 1, 2, 3, 5, 8, 13, 21 e 34 horas após a infestação, anotando-se o
mortalidade das larvas. O delineamento estatístico foi inteiramente casualizado em um fatorial 5 x 15 repetições. Os
dados coletados foram submetidos à análise de variância e quando significativo pelo teste F a 5% de probabilidade, fez-
se análise da eficiência utilizando-se a formula de Abbott. Porcentagens de controle satisfatórias foram alcançadas às 34
horas após a infestação para os tratamentos com 5,0, 2,5 e 1,0% do inseticida natural, perfazendo controles de 97,94,
98,97 e 95,88%, respectivamente. Sendo assim o óleo de nim a partir de 1,0% do v/v. foi eficiente no controle de D.
saccharalis, na configuração que a neblina foi produzida e nas condições de laboratório estudadas. |
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ISSN: | 1981-8203 1981-8203 |