红黄半皮丝叶蜂生物学特性及防治研究

STUDIES ON THE BIONOMICS AND CONTROL METHODS OF THE SAWFLY HEMICHROA CROCEA(GEOFFROY)

红黄半皮丝叶蜂是我国新发现的一种森林害虫,严重危害桤木。该虫在四川省武胜县一年发生两代,以老熟幼虫在土中结茧变成预蛹越夏越冬。第二代成虫于翌春3月上旬当气温高于12℃时开始羽化,3月下旬幼虫出现。10月下旬当气温在15℃左右时第一代成虫羽化,11月初幼虫出现,11月下旬幼虫老熟。应用80%敌敌畏2000倍液、25%杀虫双800倍液、40%氧化乐果1500倍液、40%ZML氰戊菊酯12000倍液喷杀3龄以下幼虫,收效甚好。在越夏及越冬期中将土地翻挖,可杀死土中预蛹及蛹。

The sawfly, Hemichroa crocea (Geoffrey) is a new forest insect pest in China. It severely defoliates the alder Alnus cremastogyne Burk in Sichuan Province. There are two generations per year in Wusheng County. Full-grown larvae drop to the ground. Here they spin cocoons in the top 3~5 cm of soil and aestivate or overwinter as prepupae. The adults of the second generation emerge in the following mid-March when the temperature is above 12℃ and the larvae appear during late March. The adults of the first generation emerge in late October when the temperature is at about 15℃. The larvae of the second generation appear during early November and mature in late November. The use of 80 % Dichlorvos at a dilution of 1:2000, or 25% Sha-Chong-Shuang of 1 = 800, or 40% Omethoate of 1:1500, or 40% ZML Fenvalerate of 1:12000 in controlling the first to third instar larvae reached very high mortality. Besides, digging up the soil in which the pest aestivate or overwinter could destroy the prepupae and the pupae.