Effect of Bacillus thuringiensis CAB109 on the growth, development, and generation mortality of Spodoptera exigua (Hübner) (Lepidoptera: Noctuidea)

Effect of Bacillus thuringiensis CAB109 on the growth, development, and generation mortality of... The efficiency of Bacillus thuringiensis (Bt) CAB109 on Spodoptera exigua (Hübner) (Lepidoptera: Noctuidea) larvae was investigated. This study introduces a novel concept of generation mortality (GM) was introduced. Bt CAB109 suspensions at sub-lethal concentrations of 0, 102, 103, 104, 105, and 106 cfu/ml were prepared and used to treat the second instar larvae of S. exigua. The results showed that the mortality rates of the larvae were 5.0, 8.3, 15.0, 23.3, 36.7, and 55.0% respectively after 7 days of treatment. The mean weights of treated larvae with different concentrations were 2.63, 2.19, 2.03, 1.87, 1.34, and 0.96 mg respectively after 6 days, while the developmental durations of such larvae were 16.3, 16.8, 17.5, 18.2, 19.5, and 21.2 days, respectively. Treatment with Bt affected the growth of the larvae at all instars (from the first to the fifth one). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Egyptian Journal of Biological Pest Control Springer Journals

Effect of Bacillus thuringiensis CAB109 on the growth, development, and generation mortality of Spodoptera exigua (Hübner) (Lepidoptera: Noctuidea)

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2018 by The Author(s)
Subject
Life Sciences; Zoology
eISSN
2536-9342
D.O.I.
10.1186/s41938-017-0023-y
Publisher site
See Article on Publisher Site

Abstract

The efficiency of Bacillus thuringiensis (Bt) CAB109 on Spodoptera exigua (Hübner) (Lepidoptera: Noctuidea) larvae was investigated. This study introduces a novel concept of generation mortality (GM) was introduced. Bt CAB109 suspensions at sub-lethal concentrations of 0, 102, 103, 104, 105, and 106 cfu/ml were prepared and used to treat the second instar larvae of S. exigua. The results showed that the mortality rates of the larvae were 5.0, 8.3, 15.0, 23.3, 36.7, and 55.0% respectively after 7 days of treatment. The mean weights of treated larvae with different concentrations were 2.63, 2.19, 2.03, 1.87, 1.34, and 0.96 mg respectively after 6 days, while the developmental durations of such larvae were 16.3, 16.8, 17.5, 18.2, 19.5, and 21.2 days, respectively. Treatment with Bt affected the growth of the larvae at all instars (from the first to the fifth one).

Journal

Egyptian Journal of Biological Pest ControlSpringer Journals

Published: Feb 22, 2018

References

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