Department of Entomology, CSK Himachal Pradesh Agricultural University, Palampur, 176062, Himachal Pradesh, India.
J Insect Sci. 2021 May 1;21(3). doi: 10.1093/jisesa/ieab034.
The present investigation was carried out to study the biological parameters and orientation of Sitophilus oryzae (L.) toward wheat cultivar HPW-236 and mixed grains of different cultivars (HPW-155, HPW-236, HPW-249, HPW-349, HPW-360, HS-490, and VL-892). The incubation period, larval period, pupal period, and total life cycle period of S. oryzae was longer when fed on mixed grains as compared to HPW-236. Also, the weevils were more oriented toward HPW-236 and lower germination rates were observed from HPW-236 than mixed cultivars when exposed to S. oryzae. We also evaluated quantitative losses caused by S. oryzae in different cultivars of wheat recommended in the northwestern Himalayas under free-choice conditions. The weevil inflicted greater damage and weight loss in grains of HPW-236 while it was negligible in the case of HPW-360 and HPW-249. HPW-236 which is the most cultivated variety of wheat in northwestern Himalayas proved to be highly susceptible to the weevil and provided a more suitable environment for weevil's development. Therefore, this particular cultivar can be avoided for prolong storage and the farmers should prefer cultivars such as HPW-360 and HPW-249, which proved to be least affected the weevil.
本研究旨在研究米象（Sitophilus oryzae（L.））对小麦品种 HPW-236 和不同品种（HPW-155、HPW-236、HPW-249、HPW-349、HPW-360、HS-490 和 VL-892）混合谷物的生物学参数和取向。与 HPW-236 相比，米象在食用混合谷物时，其孵化期、幼虫期、蛹期和总生命周期都较长。此外，与混合品种相比，米象更倾向于 HPW-236，并且暴露于 S. oryzae 时，从 HPW-236 观察到的发芽率较低。我们还评估了在喜马拉雅山西北部推荐的不同小麦品种下，米象在自由选择条件下造成的定量损失。在 HPW-236 中，象鼻虫造成的损害和重量损失更大，而在 HPW-360 和 HPW-249 的情况下则可以忽略不计。在喜马拉雅山西北部种植最广泛的小麦品种 HPW-236 被证明对象鼻虫高度敏感，并为象鼻虫的发育提供了更适宜的环境。因此，为了延长储存期，可以避免使用这种特定的品种，而农民应该选择 HPW-360 和 HPW-249 等品种，这些品种被证明受象鼻虫的影响最小。
