03 Ara 2024 Salı
Field evaluation of bifenazate (acramite 50wp) for control of tea mites
Abstract :Insects and mites are the most damaging of arthropod pests to tea (Camellia sinensis (L.) O. Kuntze) causing yield losses of 5–55%. Various mite species are associated with tea monocultures. In the Kangra valley, Himachal Pradesh, India red spider mites (Oligonychus coffeae) and scarlet mites (Brevipalpus phoenicis) are prevalent during June-July. For mite control, various conventional acaricides are used but resistance has developed to most of them. In India, few acaricides are recommended for controlling mites in tea. However, there are many new risk reduced selective acaricides which are reported to control mites effectively on crops other than tea. Two seasons field bioefficacy trials of bifenazate (Acramite 50WP) were conducted against red spider mites at different application rates (@ 100, 125, 175, 200, 250 g/ha) and results were compared with the propargite 57 EC (@1 l/ha). In season 1, a single spray of bifenazate @250 g/ha provided 63% control up to 35 days post treatment. Acramite @250, 200, 175, and 125 g/ha provided mite control which was not significantly different from each other. In season 2, a repeat spray was made on day 14 and treatments @250 and 200 g/ha provided 91–93% control up to 35 days. Treatments @ 175 and 125 g/ha provided 84–86% control similar to propargite @1 l/ha. In view of the per cent control of the population over a period of 35 days and depending on the situations, Acramite @200 or 125 g/ha with a follow up spray after 14 days is recommended for the control of tea mites
Tea, Camellia sinensis, Insect pest, Mites, Bioefficacy, Field trials