Sublethal Effects of Bacillus thuringiensis subsp. kurstaki Berliner on Cotton Bollworm, Helicoverpa armigera Hü bner

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VAEZ N.; IRANIPOUR SH.; HEJAZI M.J.

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Journal: Journal of Applied Research in Plant Protection Year:2018 | Volume:6 | Issue:4 Page(s): 147-163

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Title

Sublethal Effects of Bacillus thuringiensis subsp. kurstaki Berliner on Cotton Bollworm, Helicoverpa armigera Hü bner

Author(s)

VAEZ N. | IRANIPOUR SH. | HEJAZI M.J. | Issue Writer Certificate

Keywords

Bacillus thuringiensisQ2

BioassayQ1

Cotton bollwormQ1

Population parametersQ2

Abstract

Cotton bollworm, Helicoverpa armigera Hü bner (Lepidoptera: Noctuidae) is one of the important pests of agricultural products in the world, including Iran. In this study, the sublethal effects of Bacillus thuringiensis Berliner subsp. kurstaki (Bacillales: Bacillaceae) were evaluated on third instar larva of H. armigera under laboratory conditions 26± 1 ° C, 65± 10% RH and 16: 8 (L: D) photoperiod. The LC20 value of B. thuringiensis on 3rd instar larva of H. armigera was 9. 8 × 105 IU/L. The mean female longevity and fecundity in control and Bt-treatment were 16. 63 ± 1. 05 and 13. 88 ± 1. 05 days and 1336. 83 ± 147. 68 and 1029 ± 147. 68 eggs respectively that in both cases, there was a significant difference. In control and Bt-treatment, the net reproductive rate (R0) were 582. 22 ± 51. 89 and 126. 38 ± 27. 78 f/f/g, the intrinsic rate of natural increase (rm) were 0. 1442 ± 0. 002 and 0. 1082 ± 0. 004 f/f/d, the finite rate of increase (λ ) were 1. 155 ± 0. 003 and 1. 114 ± 0. 004 f/f/d, the mean generation time (T) were 44. 16 ± 0. 62 and 44. 73 ± 0. 62 d and the doubling time (DT) were 4. 80 ± 0. 08 and 6. 41 ± 021 d respectively. Except the mean generation time (T), other Population parameters of H. armigera showed a significant difference between control and Bt-treatment. The results indicated that the B. thuringiensis have high potential to reduce the Cotton bollworm population and can be recommended for reducing the use of pesticides in the areas where the pest is present.

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APA: Copy

VAEZ, N., IRANIPOUR, SH., & HEJAZI, M.J.. (2018). Sublethal Effects of Bacillus thuringiensis subsp. kurstaki Berliner on Cotton Bollworm, Helicoverpa armigera Hü bner. JOURNAL OF APPLIED RESEARCHES IN PLANT PROTECTION, 6(4 ), 147-163. SID. https://sid.ir/paper/237659/en

Vancouver: Copy

VAEZ N., IRANIPOUR SH., HEJAZI M.J.. Sublethal Effects of Bacillus thuringiensis subsp. kurstaki Berliner on Cotton Bollworm, Helicoverpa armigera Hü bner. JOURNAL OF APPLIED RESEARCHES IN PLANT PROTECTION[Internet]. 2018;6(4 ):147-163. Available from: https://sid.ir/paper/237659/en

IEEE: Copy

N. VAEZ, SH. IRANIPOUR, and M.J. HEJAZI, “Sublethal Effects of Bacillus thuringiensis subsp. kurstaki Berliner on Cotton Bollworm, Helicoverpa armigera Hü bner,” JOURNAL OF APPLIED RESEARCHES IN PLANT PROTECTION, vol. 6, no. 4 , pp. 147–163, 2018, [Online]. Available: https://sid.ir/paper/237659/en

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