辽宁海城梨小食心虫成虫发生规律调查

Occurrence dynamics of Grapholitha molesta in Haicheng City,Liaoning Province

通过监测辽宁海城地区不同梨园和不同立地条件下梨小食心虫成虫的发生数量,调查了该地区梨小食心虫发生消长规律以及发生高峰期,确定了7月中下旬是喷施农药的关键时间点。在梨小食心虫蛀梨果时期,化学药剂处理园梨小食心虫数量(45.5头)比空白园内数量(59头)明显降低,并且发生高峰推迟,高峰持续时间短。对不同品种梨园的调查结果表明,南果梨园中的梨小食心虫数量明显高于尖把梨园中的数量。不同树龄对梨小食心虫发生动态也有影响,老果园第1个和第3个发生高峰均较盛果园提前。不同光照条件对梨小食心虫数量有一定影响,阳坡的梨小食心虫数量大部分时间段明显多于阴坡的数量。诱虫盆对梨小食心虫的诱捕效果好于诱虫屋效果。上述结果可为科学掌握梨园内梨小食心虫的发生规律,提出综合防治策略提供依据。

Through investigation of numbers of （Jrapholitha rnolesta, we got the occurrence dynamics of G. molesta in different pear orchards in Haicheng City, Liaoning Province. The key time point for application of insecticides was in the middle and late July. Throughout the pear growing season, the number of G. rnolesta in the insecticide--trea ted pear orchards （45. 5） was significantly lower than that in the CK orchards（59）, and the occurrence peak was postponed and in short duration. The number of G. rnolesta in the Nanguo pear orchard was significantly more than that in the Jianba pear orchard. Both the pear tree age and the light conditions influenced the occurrence dynamics. The first peak and third peak in the old pear orchards was earlier than the similar peaks in the strong pear orchards. The number of G. rnolesta in sunny slope pear orchard was significantly more than that in shady slope pear orchard during the most period. Compared with the the triangle box sticky method, the trapping effect of the water basin method was much better. These results will supply critical basis for understanding the occurrence regularity of G. rnolesta.