Influence of grain traits on susceptibility of rice cultivars to stored product insects

Swamy, S. V. S. Gopala and Raja, D. Sandeep and Ramesh, D. and Wesley, B. John and Ramarao, C. V. (2022) Influence of grain traits on susceptibility of rice cultivars to stored product insects. CEREAL RESEARCH COMMUNICATIONS, 50 (4). pp. 1137-1144. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Stored rice suffers major quantitative and qualitative losses due to insect pests. Studies were conducted to assess 10 different cultivars of rice for resistance to grain insects: lesser grain borer, Angoumois grain moth, and red flour beetle as well as the influence of physicochemical traits of the grains that are responsible for susceptibility or resistance to insects at Post Harvest Technology Centre, Bapatla during 2020–2021. There were significant differences in the population buildup of lesser grain borer, Angoumois grain moth in rough rice, and red flour beetle in milled rice of test cultivars. BPT 2411 recorded the least emergence of lesser grain borers under no-choice (16.33 adults/100 g) and free-choice (13.0 adults/100 g) conditions. The emergence of Angoumois grain moth was the least in BPT 2411 compared to the other cultivars under free-choice conditions. On the other hand, BPT 2411 recorded a substantial decline in the population of red flour beetles in milled rice both under free-choice (23.33 adults) and no-choice (13.33 adults) conditions. The results indicated that BPT 2411 was the least preferred grain of the stored product insects. The highest kernel hardness was observed in BPT 2411 (7.28 kgf) while proteins and phenols were found at the lowest levels in BPT 2411 (5.14% and 28.0 mg GAE/100 g, respectively). Ash percent was highest in the husk of BPT 5204 (19.82%) followed by BPT 3111 (19.73%). Though significant correlations could not be drawn with grain characteristics in the case of BPT 2411, the grain hardness and low protein content could be the main factors responsible for its least suitability for progeny emergence of insects.

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