Biology of Sitophilus oryzae (L.) (Coleoptera: Curculionidae) on Four Different Germplasms of Stored Wheat Grains

Abstract

Laboratory experiments were carried out to study the biology of Sitophilus oryzae on four different wheat germplasms such as (DPW-62150, DBW-39, GW-322, and K-0307). It was found that the different developmental stages of rice weevil were longer during the winter season as compared to the summer season. As lowest incubation period of 3±0.47 days was recorded from DPW-62150 while the longest one from DBW-39 with 5.44±0.42 days. The lowest total larval and pupal period was registered in germplasm DPW-62150 (23 days) while it was highest (34.44±0.42days) in DBW-39. Total life cycle of male with food was lowest in GW-322 with 84.10±0.83 days while it was highest with 95.43±0.80 days in DBW-39; similarly for female with food the lowest and longest of life cycle was noted on the same germplasm with 110±0.82 days and 123.10±0.83 days respectively. When the male and female adults were devoid of food, the life cycle of male and female was lowest on DPW-62150 and highest on DBW-39 with 40.00±0.82 days and 44.33±0.94 days and 53.43±0.61 days and 60.43±0.8 days respectively during summer and that of winter with incubation period of 7.67±0.47 days in DPW-62150 to 11.00±0.82 days in DBW-39. Total larval and pupal period varied from 34.67±0.47 days to 42.33±0.47 days in DPW-62150 and K-0307 respectively. Total life cycle of male with food ranged from 104±0.94 days (DPW-62150) to 110.33±0.94 days (DBW-39) while for the female the range was form 128.00±0.82 days (GW-322) to 137.33±1.25 days (K-0307). On the other hand total life cycle of the male devoid of food to adult, ranged from 56±0.82 days to 66.67±0.94 days while the same for female was from 60.33±0.47 days to 73.67±0.94 days.

Chemical Compounds and Effectivity of Eucalyptus grandis Oil Against Sitophilus oryzae (Coleoptera: Curculionidae)

“…To ensure food availability at all times, proper storage of collected products is essential. Sitophilus oryzae (Coleoptera: Curculionidae) is one of the important pest of grains in the storage in warm climates and is capable of generating losses the grains of more than 18.30% [1]. This pest is classified as a polyphagous insect that destroys rice, sorghum, wheat, and corn in storage [2].…”