摘要
圆斑弯叶毛瓢虫是湿地松粉蚧的本地捕食性天敌 ,本论文通过林间散放圆斑弯叶毛瓢虫评价其对湿地松粉蚧的控制作用。结果表明 ,通过散放瓢虫的成虫和幼虫 ,增加林间瓢虫的数量 ,能较好地抑制湿地松粉蚧的增长。散放瓢虫 5 0多天后 ,在散放成虫区 ,湿地松粉蚧的对照存活率达 0 .2 8,即控制效果为 72 % ;在散放瓢虫幼虫区 ,粉蚧的对照存活率为 0 .10 ,即控制效果达 90 %。从持续作用和控制效果比较 ,散放幼虫较好 ,且以瓢虫幼虫与粉蚧雌成虫益害比为 2 :5时对湿地松粉蚧的控制效果最好。
Nephus ryuguus (Kamiya), a common ladybird beetle in China, was found becoming a dominant predator of pine mealybug Oracella acuta (Lobdell) in forest in recent years. In this paper, the effect of the ladybird beetle on the pine mealybug was evaluated by means of releasing the beetles in forest. The results showed that, the density of the pest was significantly declined after releasing the ladybird beetles. Compared with the control the survival rate of the mealybug was reduced to 0.28 and 0.1 in the areas where adult and larva were released respectively. The best control effect was gained when the predator was released with the ratio of predator: prey as 2:5.
出处
《武夷科学》
2002年第1期120-124,共5页
Wuyi Science Journal
基金
广东省自然科学基金项目 (990 7180)
