Sahil AL- Jamil; Ibrahim Hassan
Volume 19, Issue 2 , June 2019, , Pages 100-105
Abstract
The study was carried out to evaluate the pathogenicity of the bacteria, Bacillus thuringensis of the cotton leafworm, Spodoptera littoralis (Boisd) at the rate of 1x106 spores/ml Laboratory results revealed that egg hatching percentage, at the age of 1-2 days were 0.0, 0.0 and 8.2 % 2 and 4 days after ...
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The study was carried out to evaluate the pathogenicity of the bacteria, Bacillus thuringensis of the cotton leafworm, Spodoptera littoralis (Boisd) at the rate of 1x106 spores/ml Laboratory results revealed that egg hatching percentage, at the age of 1-2 days were 0.0, 0.0 and 8.2 % 2 and 4 days after application respectively. While the hatching percentage of the 3-4 days old eggs was 6.8% at the age of 2-4 days after 2 days' treatment. The mortality rate of larval stages (2, 4, 6 instars) was 100% 14 days after application. When pupae were treated with the bacteria adult emergence percentage was 51.3 % 15 days after treatment compared to 100% emergence for the control treatment. The results in greenhouse show that the entomopathogenic bacteria also achieved mortality rate for 2, 4, 6 larval instars of the pest were 94.4, 91.8, 100, 88.4, 85.6 and 81.3 % for the soil and plant treatments respectively, 14 days after application.