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United States Department of Agriculture

Agricultural Research Service

Research Project: Insecticide Resistance Management and New Control Strategies for Pests of Corn, Cotton, Sorghum, Soybean, and Sweet Potato

Location: Southern Insect Management Research Unit

Title: Adverse influence on reproduction and potential fitness cost in survivors of orthene-treated tarnished plant bug, Lygus lineolaris

Authors
item He, Yueping -
item Zhu, Yu Cheng
item Luttrell, Randall

Submitted to: Midsouth Entomologist
Publication Type: Abstract Only
Publication Acceptance Date: March 1, 2012
Publication Date: March 1, 2012
Citation: He, Y., Zhu, Y., Luttrell, R.G. 2012. Adverse influence on reproduction and potential fitness cost in survivors of orthene-treated tarnished plant bug, Lygus lineolaris. Midsouth Entomologist. 5:21-21. In Abstracts of the 58th Annual confernce of the Mississippi Entomological Association.

Interpretive Summary: By using dose response to Orthene at 80 mg/L (LC50 of the laboratory susceptible colony), a relative resistant population (71% survival rate) of the tarnished plant bug, Lygus lineolaris, was located near Tillar, Arkansas. This population was used in this study to evaluate potential fitness cost in Orthene-resistant bugs. After the bugs were treated with Orthene at 240 mg/L for 2 days, approximately 38% of the bugs died. The survivors were transferred to a untreated fresh diet for investigating the mortality, fecundity, hatchability, survival rate from nymph to adults, and estimating the population growth index and relative fitness. Results showed that after being treated with Orthene, this insect had a post-treatment response to the pesticide, such as the increasing adult mortality, a lower fecundity and lower hatching rate, and a lower population growth index. Our results suggest a potential fitness cost (the relative fitness value was 0.41) for the Orthene resistance development in the tarnished plant bug.

Technical Abstract: By using dose response to Orthene at 80 mg/L (LC50 of the laboratory susceptible colony), a relative resistant population (71% survival rate) of the tarnished plant bug, Lygus lineolaris, was located near Tillar, Arkansas. This population was used in this study to evaluate potential fitness cost in Orthene-resistant bugs. After the bugs were treated with Orthene at 240 mg/L for 2 days, approximately 38% of the bugs died. The survivors were transferred to a untreated fresh diet for investigating the mortality, fecundity, hatchability, survival rate from nymph to adults, and estimating the population growth index and relative fitness. Results showed that after being treated with Orthene, this insect had a post-treatment response to the pesticide, such as the increasing adult mortality, a lower fecundity and lower hatching rate, and a lower population growth index. Our results suggest a potential fitness cost (the relative fitness value was 0.41) for the Orthene resistance development in the tarnished plant bug.

Last Modified: 8/27/2014
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