果实套袋对梨小食心虫危害程度的影响

Effect of fruit bagging on damage of Grapholitha molesta

梨小食心虫(Grapholitha molesta Busck)是梨、桃、李等经济果树的重要害虫之一。为切实明确果实套袋方法在防控梨小食心虫上的应用,研究比较了不同时间、不同程度的和不同部位梨果套袋处理对梨小食心虫危害程度的影响。结果表明,套袋程度和套袋时间可显著影响梨小食心虫蛀果率及虫口数量,套袋时间越早、套袋程度越高,效果较好,梨树落花后20—40天后进行100%套袋,蛀果减退率96.96%,虫口减退率达90.51%;10%、30%套袋效果与不进行套袋无显著性差异;仅套取上部果实较仅套取中部果实和仅套取下部梨果,对梨小食心虫防控效果较好。

Grapholitha molesta is one of the most important fruit pest.To know the effectiveness of using fruit bagging to manage the pest,an investigation that collecting the boring rate and population quantity of the pest was conduct in pear-gardens with bagging different extent,bagging different periods,and bagging fruits of different parts.Results showed that bagging for different extent or different periods could significantly influence the boring rate and population quantity of Grapholitha molesta.The best effect for bagging was the period from 20d to 40d after flowering and 100%bagging.In this way,the boring decline rate could reach to 96.96%and the population density of the moth reduced by 90.51%.There were no significant impact on 10%bagging,30%bagging and no bagging.Bagging for the fruits upside of the branches,the effect that controlling population quantity of Grapholitha molesta,was better than only bagging the fruits middle part and bottom of the branches.