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10 September 2015 Resistance of Rice Varieties to the Stored-Product Insect, Sitophilus zeamais (Coleoptera: Curculionidae)
Catarina Antunes, Raquel Mendes, Arlindo Lima, Graça Barros, Paul Fields, Luísa Beirão Da Costa, José Carlos Rodrigues, Maria José Silva, Augusto Manuel Correia, Maria Otilia Carvalho
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Abstract

Four common Portuguese rice varieties—Thaibonnet, Gladio, Albatros, and Eurosis—were tested for their relative susceptibility to Sitophilus zeamais Motschulsky, a common pest of stored rice in Portugal and in tropical countries. Physical (moisture content, hardness, length, and width) and chemical (by attenuated total reflection-Fourier transform infrared spectroscopy) properties of rice kernels were measured. Insect bioassays measured median developmental time, Dobie's index of susceptibility, percentage of damaged grains and weight loss, and progeny developed. This was done for paddy, brown rice, and polished rice for each variety. There were small, but significant, differences in insect resistance among the varieties. However, it was different for paddy and polished rice. In paddy, these differences were correlated with hull damage, and Eurosis was the most susceptible variety. In polished rice, resistance was correlated with hardness, and Thaibonnet was the most susceptible variety. In general, paddy rice was more resistant to insect attack, followed by polished rice and then brown rice. Paddy kernels selected with undamaged hull were completely resistant to attack. Implications for IPM and breeding for resistant varieties are discussed.

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Catarina Antunes, Raquel Mendes, Arlindo Lima, Graça Barros, Paul Fields, Luísa Beirão Da Costa, José Carlos Rodrigues, Maria José Silva, Augusto Manuel Correia, and Maria Otilia Carvalho "Resistance of Rice Varieties to the Stored-Product Insect, Sitophilus zeamais (Coleoptera: Curculionidae)," Journal of Economic Entomology 109(1), 445-453, (10 September 2015). https://doi.org/10.1093/jee/tov260
Received: 18 May 2015; Accepted: 10 August 2015; Published: 10 September 2015
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KEYWORDS
ATR-FTIR
Sitophilus zeamais
storage
susceptibility
variety
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