茶园害虫捕食性天敌——厉蝽的生物学特性初步研究

Biological characteristics of Cantheconidea concinna Walker, a natural enemy to pests in tea garden

初步研究茶园害虫天敌——厉蝽(Cantheconidea concinna Walker)的生物学特性、捕食行为和控制效能,并对其应用前景进行探讨。该虫在闽东一年发生多代,7-8月为发生高峰期;若虫有刺吸茶树汁液的习性;3龄若虫才开始对害虫有捕食能力,日均捕食量随龄期的增大而增多,而随猎物幼虫龄期的增大而减少;捕食茶尺蠖时捕食量随猎物密度的增大而增多,以3龄厉蝽最明显,而捕食时相互间的干扰作用,以5龄若虫时最为明显;在益害比4:40时,控制效能达34.17％。

The biological characteristics, the predatory behavior and the controlling efficacy of Cantheconidea concinna Walker were studied, and its applied prospects were discussed. There are many generations a year in eastern Fujian, the climax of population dynamics occurs on July to August. The results showed that the nymph of Cantheconidea concinna Walker had a tendency to suck juice from tea shoot, the 3rd instar of Cantheconidea concinna Walker start to prey, the average daily catching number increased with the increase of the instar of predator, and reduced with the increase of the instar of prey. As the density of larvae of Ectropis obliqua Warren increased, the daily preying capacity of Cantheconidea concinna Walker increased, especially in 3rd instar. The mutual interference effect of the population density of the predator especially in 5th instar to its preying activity was significant. The controlling effect of the nymph of Cantheconidea concinna Walker on larvae of Ectropis obliqua Warren was 34. 17% under the ratio of the natural enemy to prey by 4:40.