POTENTIALITY OF SOME BOTANICALS AGAINST RICE WEEVIL, GRANARY WEEVIL AND PULSE BEETLE

The experiment was carried out to investigate the potentiality of botanicals on pulse beetle, rice weevil and granary weevil at the laboratory of Entomology of Patuakhali Science and Technology University (PSTU) during the period from April 2017 to March 2018. The experiment was laid out in CRD with three replications for each treatment. Four treatments ie. T0 (control), T1 (Polygonum hydropiper L. leaves), T2 (Powder of Nerium indicum) and T3 (Powder of Azadirachta indica leaves) were used on pulse beetle, rice weevil and granary weevil to determine the potentialities of botanicals. The highest mortality rate of pulse beetle was observed in T1 (100%), followed by T3 (33.33%) and lowest mortality rate was observed in T0 (0.00%) followed by T2 (26.67%) on pulse. The highest mortality rate of rice weevil was observed in T1 (83.3%), followed by T3 (70.0%) and lowest mortality rate in T0 (0.00%) followed by T2 (63.3%) on rice. The highest mortality rate of granary weevil was observed in T1 (73.3%), followed by T3 (56.7%) and lowest mortality rate was observed in T0 (0.00%) followed by T2 (36.7%). The highest oviposition rate was observed in T0 (47.33), followed by T2 (39.66) and lowest oviposition rate was observed in T1 (0.00) followed by T3 (26.66) in case of pulse beetle. The highest weight loss occurred in T0 (5.93 gm) followed by T3 (4.92 gm). The lowest loss observed in T1 (0.00 gm) followed by T2 (4.55 gm) in pulse. The highest weight loss observed in T0 (5.33 gm) followed by T2 (2.78 gm). The lowest loss observed in T1 (1.70 gm) followed by T3 (1.88 gm) in rice. The highest loss occurred in T0 (6.33 gm) followed by T2 (2.32 gm). The lowest loss observed in T1 (1.62 gm) followed by T3 (1.44 gm) in case of granary weevil. The highest germination occurred in T1 (43.33%) followed by T3 (11.66%). The lowest germination observed in T0 (0.00%) followed by T2 (1.42%) in pulse. Therefore among all treated botanicals in this experiment biskathali leaf powder (Polygonum hydropiper L. leaves) can be the right choice considering all aspects of life for controlling pulse beetle, rice weevil and granary weevil in the storage of mills, factories and in case of house storage as well. Besides bishkathali neem leaf powder (Azadirachta indica leaves) can also be used in the storage.

Overall bishkathali gave best results among the three botanicals. So, I would like to suggest bishkathali for controlling stored grain pest.