Rice weevil (Sitophilus oryzae L.)

Laboratory experiments were carried out to study the effect of milling methods on the infestation of Sitophilus oryzae on stored rice grains during 2016-17. The results of the present investigation reveals that rubber milled rice were more preferred by the weevils than the iron milled rice with significant differences in weight loss existing among the various rice categories and the highest weight loss per cent was registered from SBA rice category (31.26±0.60 and 33.07±0.62) and the lowest from SMNA rice category (24.47±0.55 and 25.98±0.56) in 2016 and 2017 respectively.

7p caygaocaolon7 18-09-2020 9 2   Download

Laboratory studies were conducted at Department of Crop Protection, Agricultural College and Research Institute, Valavachanur – 606 753, Thiruvannamalai District to study the effect of plant powders tested against rice weevil, Sitophilus oryzae infesting sorghum. The experiment on ten plant powders 2 per cent, among them Acorus calamus 2 per cent rhizome powder was found to be significantly the best compared to other treatments.

10p caygaocaolon6 30-07-2020 12 2   Download

The present investigation was carried out to analyse for the presence of α-amylase inhibitor gene which is responsible for resistance to rice weevil. A total of 30 simple sequence repeat (SSR) markers were used to study the genetic diversity among 30 wheat genotypes resistant to rice weevil. Among them, seventeen primers were found polymorphic on agarose gel and depicted the significant diversity among susceptible and resistant genotypes while rest thirteen primers were found monomorphic.

12p nguaconbaynhay5 16-05-2020 23 1   Download

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.

6p chauchaungayxua5 08-05-2020 10 1   Download