猕猴桃桑白蚧防治时期和生殖力的研究

Study on Timing of Controlling White Peach Scale and Fecundity

桑白蚧是危害猕猴桃的一种重要虫害,在四川一年发生3代,以受精雌成虫越冬,每个雌虫平均产100个卵。第一代4月中旬至6月下旬,第二代7月上旬至8月下旬,第三代9月上旬至翌年4月上旬。在自然条件下桑白蚧的卵发育起点为11.4℃,有效积温为89.8日度。经过一年3个世代其种群可增长20.78倍。一龄若虫盛期分别为4月下旬、7月上旬、9月上旬,此时若虫无蚧壳保护,是防治的最佳时期。

The White Peach Scale （WPS）, pseudaulacaspis pentagona （trag. - Tozz）, was considered one of the most damaging pest of kiwifruit in China. It had three generations a year and overwintered as fertilized females. Oviposition began about mid- April, the females laying an average of 100 eggs each, the threshold temperature of eggs under the field conditions was C = 11.4 ℃, and the effective accumulated temperature was 89.8 degree - days. The population could increase 20.78 times per year, The peak of first instar was post - April, pre - July, and pre - September. Based on this research, the first instar crawler stage of WPS was predicted.