Bacillus thuringiensis Sublethal Concentration: Effects on Population Reproduction of Callosobruchus chinensis (Linnaeus)

doi:10.11924/j.issn.1000-6850.casb20200100001

Abstract

Abstract:

In order to determine the effect of Bacillus thuringiensis on the population reproduction of Callosobruchus chinensis, a laboratory bioassay was conducted on the adults of Callosobruchus chinensis by macerating method. The results showed that the fatality rates of adults were 95.56%, 70.00%, 36.67%, 21.11%, 7.78%, respectively, when the doses of Bacillus thuringiensis were 80.0 IU/mg, 53.3 IU/mg, 32.0 IU/mg, 26.7 IU/mg, 20.0 IU/mg, respectively. Its virulence regression equation was y=0.38x+2.91. LC₁₀, LC₃₀and LC₅₀ significantly shortened the lifespan of the adults of Callosobruchus chinensis and inhibited the oviposition of female adults. After being treated by LC₁₀, LC₃₀or LC₅₀, the net reproduction rate, intrinsic growth rate and finite rate of increase were lower than that of the control, while the population doubling time was prolonged obviously. It indicates that Bacillus thuringiensis has a good insecticidal effect, and the sublethal dose has a significant inhibiting effect on the population development of Callosobruchus chinensis.

Key words: Callosobruchus chinensis (Linnaeus), Bacillus thuringiensis, sublethal concentration, reproduction

CLC Number:

Yang Jiale, Ma Xin, Cao Min, Yu Huiping, Yang Qian, Zhang Lixiang. Bacillus thuringiensis Sublethal Concentration: Effects on Population Reproduction of Callosobruchus chinensis (Linnaeus)[J]. Chinese Agricultural Science Bulletin, 2020, 36(24): 132-135.

Figures/Tables 4

References 24

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参数	处理
参数	对照	LC₁₀处理组	LC₃₀处理组	LC₅₀处理组
净增值率 R₀	31.1610	1.0508	0.5750	1.1082
平均时代周期 T	30.0118	28.0449	27.9700	28.0976
内稟增长率 r_m	0.1146	0.0018	-0.0198	0.0037
周期增长率 λ	1.1214	1.0020	0.8200	1.0037
种群加倍时间 t	6.0480	385.0600	-3.5005	189.8900

参数	处理
参数	对照	LC₁₀处理组	LC₃₀处理组	LC₅₀处理组
净增值率 R₀	31.1610	1.0508	0.5750	1.1082
平均时代周期 T	30.0118	28.0449	27.9700	28.0976
内稟增长率 r_m	0.1146	0.0018	-0.0198	0.0037
周期增长率 λ	1.1214	1.0020	0.8200	1.0037
种群加倍时间 t	6.0480	385.0600	-3.5005	189.8900