桂花叶蜂的生物学和防治

桂花叶蜂是桂花树的主要害虫之一。幼虫取食嫩叶,对桂花树造成严重损害。在广西桂林一年发生一次。以老熟幼虫于土内作茧越冬。孤雌或两性生殖。幼虫期五龄,预蛹期长达270多天。试验结果表明,80%敌敌畏乳剂1000—1500倍液或40％乐果乳剂1000—5000倍液对幼虫均有良好的防治效果。

BIONOMICS AND CONTROL OF THE SWEET OSMANTHUS SAWFLY (TOMOSTETHUS SP.)

The Sweet Osmanthus Sawfly (Tomostethus sp.), is one of the most important pests of the Sweet Osmanthus (Osmanthus fragrans Lour.). The larvae feed on the tender leaves and cause injury to Sweet Osmanthus trees. It has one generation each year in Guilin, Guangxi. Winter is passed as mature larvae (prepupae) within cocoons in the soil. Reproduction is parthe-nogenetical or bisexual. There are five instors. The prepupae stage is as long as 270 days. Studies of control have shown that it is very effective to spray with Dichlorvos or Dimethoate in the control of 2nd-4th instar larvae.