Response of Rice Varieties to Rice Leaffolder Infestation
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Abstract
The objectives of this research were to study the response of rice varieties popularly grown in lower northern Thailand and their morphological characters on the infestation of rice leaffolder (Cnaphalocrocis medinalis (Guenee)) in greenhouse. The rice varieties: PSL 2, RD29, RD31, RD41, RD43, RD49, RD61 and RD71 were planted in cement tanks covered with fabric insect net and placed in the greenhouse. The rice leaffolder adult were released into those insect net when the rice was 30 days old. Then the number of rice leaffolder larva, the number of damaged leaves and also the morphological characters of rice in each variety were determined and recorded every week for up to 5 weeks. The result revealed that the lowest average numbers of rice leaffolder was found on RD43, RD61 and RD41 at 0.09, 0.10 and 0.11 insects / plant as well as the lowest average numbers of damaged leaves at 13.2, 14.7 and 14.0 leaves / plant, respectively. The infesting insect numbers on those rice varieties were positively correlated to tillering ability at 66 % and negatively correlated to panicle type at 61 %. Meanwhile the numbers of damaged leaves of those were highly positively correlated to leaf angle, sterile lemma color and amylose content of the grain at 96, 96 and 92 %, respectively, and highly negatively correlated to scent at 96 %.
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References
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