Year: 2022 | Month: June | Volume 15 | Issue 2
Evaluation of Certain New Insecticides for the Management of Tea Mosquito Bug, Helopeltis theivora Waterhouse (Hemiptera: Miridae) in Tea
N. Santhana Bharathi
T.P. Rabeesh
P. Mahendran
B. Suresh Kumar
DOI:10.30954/0974-1712.02.2022.12
Abstract:
The tea mosquito bug is one of a major pest in tea. The promising and effective insecticides are limited for the control of TMB and repeated use of similar pesticides for a prolonged period leads to the development of resistance in TMB. In this view, a study was done on finding new and effective pesticides for the control of TMB. Overall fifteen synthetic insecticides were evaluated with 50 treatments against TMB under laboratory conditions. Based on the laboratory evaluation, the effective insecticides were selected for further field evaluation from 2020 to 2021 in Valparai, Coimbatore. TMB reduction percentage, yield analysis and phytotoxicity studies were undertaken during the study period. In the laboratory, seven treatments achieved 100% adult mortality on TMB after 24 hours of application. From the field evaluations, four treatments Viz., Beta-cyfluthrin + Imidacloprid @ 625 mL/ha, Sulfoxaflor @ 250 g/ha, Tolfenpyrad @ 1000 ml/ha and Flupyradifurone 1000 ml/ha were showed 87, 84, 83 and 83% of TMB reduction respectively over the control. Similarly, the above-mentioned treatments also achieved 140, 201, 220 and 208% of increased yield, respectively over the control. From the study, new pesticides produced superior results in the reduction of TMB percentage as well as increase the crop yield.
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Highlights
- Fifteen treatments were found to be effective on TMB under laboratory conditions.
- New insecticides Viz., Beta-cyfluthrin + Imidacloprid @ 625 mL/ha, Sulfoxaflor @ 250 g/ha, Tolfenpyrad @ 1000 ml/ha and Flupyradifurone 1000 ml/ha produced excellent TMB reduction percentage as well as increase yield also.
- These new molecules might have a new hope of breaking the resistance chain in TMB.
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