女贞黑叶蜂的生物学及其防治

女贞黑叶蜂在重庆一年发生一代,幼虫老熟后在土中作土室滞育,越夏越冬。次年3、4月间化蛹、羽化,产卵于芽叶边缘。成虫啮食女贞嫩叶,幼虫常将叶片及在叶上定居的一龄白蜡虫吃光,严重影响生产。在挂放蜡虫前,用残效期短的 DDVP 等农药喷雾,可有效地控制成虫、幼虫的危害。

BIONOMICS AND CONTROL OF THE SAWFLY(Macrophya sp.)

The sawfly(Macrophya sp.)has one generation each year in ChongQing.Mature larvae survive through the summer and winter within thecell in the soil.The eggs are individually laid in slits cut in the marginalof the tender leaves.The adults feed on the tender leaves and the larvaesometimes eat up the leaves and the first stage larvae settled in the leavesof China wax scale insect,causing severe injury to the China wax produc-tion.There are five or six larval instars.When the state of being matu-rity,the larvae descend to the ground and make their cells in the soil,in the meantime become dorment(diapause).Laboratory and field studies have shown that it is very effectiveto spray with 90% Dipterex(1:1500),80% DDVP(1:2000),20% Sumicidin(1:8000),40% Rogor(1:2000)or 80% Malathion(1:2000)in the controlof 2nd-4th instar larvae.