食料条件对稻纵卷叶螟生长发育和繁殖的影响

THE EFFECTS OF FEEDING CONDITION ON THE GROWTH,DEVELOPMENT,AND REPRODUCTION OF RICE LEAF ROLLER

网室盆栽水稻饲养稻纵卷叶螟结果表明:不同品种、不同生育期和不同施氮水平的水稻,对幼虫和蛹的存活率、蛹重、成虫产卵前期、产卵期、寿命和繁殖力有影响;但对幼虫发育历期影响不大。并提出了评价食物质量的综合指标,F(适合度指数)=S(选择性指数)×Ⅰ(种群增长指数)。室内取食试验结果表明:食物利用指数有显著的龄间差异;幼虫对取食有一定的调节能力;水稻含氮量主要影响幼虫消化食物转化率,含硅量则影响幼虫取食行为。

As the rice leaf roller Cnaphalocrocis medinalis Guenée feeding onpotted rice,it is found that the survival of larvae and pupae,pupaweights,durations of pre-oviposition and oviposition,longevity,andfecundity of adults varied with different varieties,and developmentalstages of rice growing on different nitrogen levels,while the durationof immature stage of this insect was stable.A synthetic index forevaluating the food quality were then presented as follows: F(fitness index)=S (preference index)×I(population increaseindex) The results of feeding experiments carried out in laboratory showedthat there were significant differences among the food utilization indi-ces of different insect instars.The larvae were able to regulate theirfeeding behaviour.The nitrogen content in rice plant mainly affectedthe rate of Efficiency of Conversion of Digested Food (ECD).Thesilicon content limited the feeding behaviour of larvae.