USE OF NEEM PRODUCTS FOR THE CONTROL OF JUTE YELLOW MITE, Polyphagotarsonemus latus (Banks) AND RED MITE, Tetranychus bioculatus (Wood—Mason)

Abstract

In order to study the efficacy of different neem products for the control ofjute mites (yellow mite, Poivplzago:orsonernus lot its Banks and red mite. Tetronvclzus hioculatus Wood- Mason). and its effect on predators, several experiments were conducted at Iaboratoiy, greenhouse and in the field of Bangladesh Jute Research Institute during the period from March to December 2007. In the greenhouse condition, the highest % mortality (67.37) was observed in the plot treated with 3% neem oil but it had some phytotoxie effect on jute leaves, therefore from the green house experiment. 2% neem oil was selected as most appropriate dose for field experiment as higher dose cause phytotoxicity on plant. In field experiment, highest % reduction of infestation over control (79.23'h lowest number of nodes per plant (53.25). highest plant height (3.28 iii), and highest % of yield increased (39.33%) over control were observed in the plot treated with 2% neem oil. Benefit cost ratio was also found highest (16.55) from 2% nccm oil treated plot. In late jute seed crop, the highest % reduction of infestation by red mite (75.17%) and yellow mite (75.28). maximum 1000 seed weight (2.53 g). % germination (86%) and seed vigour (56) was recorded from 2% necm oil treated plots. It was observed that Acarieide such as Sulphur. Chlorinated hydrocarbon, Organophosphate and Abamectin killed all the predators of' jute mites tested while; there is no harmful effect of neem products on predators.