Liao Chung-Ta, Chen Chung-Li
Taichung District Agricultural Research and Extension Station, COA, 370 Song Hwai Rd., Dacun Twp., Changhua County 51544, Taiwan (R.O.C.) (
Corresponding author, e-mail:
J Econ Entomol. 2017 Jun 1;110(3):1291-1297. doi: 10.1093/jee/tox071.
Cnaphalocrocis medinalis Guenée is a noxious rice pest during cultivated periods. Cnaphalocrocis medinalis moths lay eggs on leaf surfaces, and larvae longitudinally roll the leaves to hide inside the leaf buds and feed on the upper epidermis and mesophyll tissues. In this study, we evaluated the female oviposition preference and larval performance of C. medinalis on six insect-resistant and six insect-susceptible rice genotypes. Female moth choice and no-choice oviposition preferences were studied. The number of eggs laid on the leaf varies among selected rice genotypes; however, female adults prefer to lay more eggs on both some resistant and susceptible rice genotypes. Furthermore, newly hatched larvae showed no observed differences in preference for both specific resistant and susceptible rice genotypes. The time taken by larvae for leaf selection varied significantly after inoculation on different genotypes at the maximum tillering and heading stages of rice plants. Compared with susceptible genotypes, leaf selection time was prolonged in resistant genotypes. In addition, the time taken for folding primary vegetative and flag leaves by larvae varied among the selected rice genotypes; larvae required more time to fold leaves of resistant than susceptible genotypes. In host antibiosis tests, larval and pupal survival and pupal weight were higher in susceptible than resistant genotypes. The results showed that the time required by larvae for leaf rolling and host antibiosis should be considered as the most crucial factors for rice genotypes resistant to C. medinalis.
稻纵卷叶螟是水稻种植期间的一种有害害虫。稻纵卷叶螟成虫在叶片表面产卵，幼虫将叶片纵向卷起，藏于叶苞内，取食上表皮和叶肉组织。在本研究中，我们评估了稻纵卷叶螟在6种抗虫水稻基因型和6种感虫水稻基因型上的雌虫产卵偏好及幼虫生长表现。研究了雌蛾的选择和非选择产卵偏好。在所选择的水稻基因型中，叶片上的产卵数量存在差异；然而，雌成虫在一些抗虫和感虫水稻基因型上都倾向于产更多的卵。此外，新孵化的幼虫在对特定抗虫和感虫水稻基因型的偏好上没有观察到差异。在水稻植株的最高分蘖期和抽穗期接种到不同基因型上后，幼虫选择叶片所需的时间有显著差异。与感虫基因型相比，抗虫基因型的叶片选择时间延长。此外，幼虫折叠初生营养叶和旗叶所需的时间在所选择的水稻基因型中也有所不同；幼虫折叠抗虫基因型叶片比感虫基因型叶片需要更多时间。在寄主抗生性试验中，感虫基因型中的幼虫和蛹的存活率以及蛹重均高于抗虫基因型。结果表明，幼虫卷叶所需时间和寄主抗生性应被视为水稻对稻纵卷叶螟抗性基因型的最关键因素。
