上海地区悬铃木方翅网蝽种群动态及防治指标

Population dynamics and control threshold of sycamore lace bug,Corythucha ciliata in Shanghai

定期调查了悬铃木方翅网蝽的虫口密度和悬铃木叶片的受害情况,利用悬铃木效益成本比,计算悬铃木方翅网蝽的经济允许损失水平,结合虫口密度与危害指数回归方程,确定了悬铃木方翅网蝽的防治指标。结果表明:悬铃木方翅网蝽卵、若虫、成虫1年有5个相对明显的高峰期,4月中下旬虫口密度开始上升,7月下旬至9月中旬为种群发生高峰。悬铃木方翅网蝽的经济允许损失水平为36.77%,其百叶虫量与危害指数间呈显著的Logistic回归,其关系式为Y=0.928 4/(1+e0.895 2-0.001 9x),防治指标为250头成若虫/百叶。根据"早防早治"原则,在上海地区,悬铃木方翅网蝽在4月中下旬虫口密度达到防治指标时,需及时开展防治。

The population density of the sycamore lace bug Corythucha ciliata （Say） and damage level were inves tigated to evaluate the economic injury level （EIL） with the benefit/cost ratio of the Platanus. The regression e quation of population density and damage index was fitted. The results indicated that there were five significant peaks in the occurrence of the eggs, nymphs and adults per year. The bugs were first found in the middle and last ten days of April and the peak period of population occurrence was from the last ten days of July to mid-Septem- ber. The EIL was determined as 36.77%. There was significant correlation between population density and dam age indices, fitting the Logistic regression model. Y= 0. 928 4/（1 ＋ e^0. 8952-0.0019x ）. The control threshold was 250 adults and nymphs per hundred leaves. Based on the management strategy of ＂early prevention and early control＂, the optimum control period is from mid-to end of April, when the density reaches the control threshold.