天津市混栽梨园中不同品种梨树上中国梨喀木虱的发生规律

为明确梨木虱在不同品种梨树上的发生规律，于2015-2016年对天津市混栽梨园中3个品种梨树上中国梨喀木虱Cacopsylla chinensis的周年发生情况进行调查。结果表明，中国梨喀木虱冬型成虫在早酥梨树上的出现日期为2月底，在黄冠和晚秋黄梨树上的出现日期为3月上旬至中旬。3月中下旬始见第1代卵，4月上旬达高峰期，4月下旬孵化为若虫并达到高峰期，4月底至5月初始见第1代夏型成虫，5月上旬至下旬达高峰期；5月下旬第2代若虫孵化，6月初达高峰期，中旬成虫羽化，下旬成虫达高峰期；6月底至7月初第3代若虫陆续出现，7月上旬至下旬达高峰期，下旬成虫羽化；8月上旬第4代若虫出现，中下旬达高峰期；9月中旬第5代若虫出现，月底达高峰期。早酥梨树上中国梨喀木虱发生高峰期的数量显著高于黄冠和晚秋黄梨树上的数量，晚秋黄梨树上1、2代的发生量显著高于黄冠梨树上的发生量。

Investigation of the occurrence regularity of Cacopsylla chinensis on different pear cultivars in multi-cultivar pear orchards in Tianjin

In order to master occurrence the regularity of Cacopsylla chinensis in multi-cultivar pear orchards of Tianjin, the population dynamics of C. chinensis on three pear cultivars were investigated in Tianjin during 2015-2016. The results showed that winter-type adults emerged in late February on Zaosu cultivar and in early to mid-March on Huangguan and Wanqiuhuangli cultivars. The eggs of 1st generation appeared in mid- to late March and peaked in early April; the nymphs appeared in late April and peaked subsequently, and the adults of the 1st generation emerged in late April to early May and peaked in the whole May. The nymphs of 2nd generation appeared in late May and peaked in early June, and the adults appeared in middle June and subsequently peaked in late June. The nymphs of 3rd generation appeared in late June and early July and peaked in early and mid-July, and the adults subsequently emerged in late July. The nymphs of 4th generation appeared in early August and peaked in mid- and late August, and the nymphs of 5th generation appeared in mid-September and peaked in late September. The number of C. chinensis on Zaosu cultivar was higher than on other cultivars during peak periods. The number of 1st and 2nd generations on Wanqiuhuangli cultivar was higher than on Huangguan cultivar.