Effect of certain indigenous extracts against tea mosquito bug, Helopeltis theivora (Waterhouse) (Hemiptera: Miridae) in tea

Abstract

An investigation entitled “Effect of certain indigenous extracts against tea mosquito bug, Helopeltis theivora (Waterhouse) (Hemiptera: Miridae) in Tea” was carried out at Deha Tea Estate, Jorhat, Assam, India during 2015-2016 by using different indigenous extracts. Fish extract at (0.25, 0.5 and 1) %, Polygonum hydropiper at (2.5, 5 and 7.5) % and Azadirachtin-5% (Neemazal-F) were evaluated in field condition against tea mosquito bug. The result showed that fish extract in combination with cow dung, cow urine and water when sprayed at 1% concentration and Polygonum hydropiper in combination with cow urine and water when sprayed at 7.5% concentration significantly reduced the percentage of shoots infested by tea mosquito bug. Both Fish extract and Polygonum hydropiper extract combinations were found to increase plucking point density and yield of tea. Among all the ITKs, fish extract at 1% caused higher reduction of infestation of tea mosquito bug followed by Polygonum hydropiper extract at 7.5%. Influence of both the treatments on the management of tea mosquito bug was at par with that of commercial Azadirachtin (5%).