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The tea mosquito bug, Helopeltis theivora (Waterhouse), is an important  economic pest of tea in India. The development of resistance in H. theivora  populations obtained from a conventional plantation as compared with a strain  from an organic plantation was studied in the laboratory for five  generations, and associated changes in life cycle traits were assessed.  Selection using sublethal concentrations of deltamethrin resulted in a  5.19-fold increase in insecticide resistance ratio from the F1 to the F5  generation in the H. theivora population from the conventional plantation. By  the F5 generation, nymphal duration and total developmental duration and  adult longevity were higher and fecundity was lower in the  deltamethrin-selected strain than in the non-selected strain from a  conventional plantation and the susceptible strain from an organic  plantation. These findings have practical implications for insecticide  resistance management of this important sucking pest of tea

archives of biological sciences

Comparison of life cycle traits of a Helopeltis theivora Waterhouse (Heteroptera: Miridae) population infesting organic and conventional tea plantations, with emphasis on deltamethrin resistance