ABSTRACT
The crop suffers from the attack of a number of pests and pathogens, causing significant yield losses. The feeding activity of this mite on the leaves of tea induce drastic reduction in the level of the major photosynthetic pigment chlorophyll. Chlorophyll is an essential element of photosynthesis, and its content in plant leaves indicates their photosynthetic capacity. The modern usages of various synthetic chemicals for the control of pests have led to various environmental concerns. The mature fruits of custard apple were collected from Bankura district under Red and Lateritic Zone of West Bengal. The seed materials were separated from fruits, dried in shade, and made into powder by using an electric grinder or blender. The leaves were placed with the bottom side up on the wet cotton sponge in which the petiole was also cushioned. Tea bushes were sprayed separately using a high volume Knapsack sprayer, taking care to avoid drip.
