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作 者 ：伍佩珩

期 刊 ：林业科学 1982年 18卷 1期 页码：44-52

关键词：榆；

摘 要 ：榆兰叶甲(Galerucella aenescens F.)各个时期种群的组成、生理状况、温湿度变化与药剂药效有着密切的关系。(1)榆兰叶甲的抗药性与生理状况的关系如下:幼虫阶段1龄<2龄<3龄<老熟;成虫阶段新羽化成虫<越冬成虫飞出盛期<成虫补充营养期<成虫准备越夏期。(2)季节温湿度变化对药效的影响:气温低时DDT的药效比敌百虫高,死亡速度亦快;但气温高时,敌百虫又比DDT的药效高,致死速度亦快;鱼藤酮的情况与敌百虫相似,但不象敌百虫表现得那么显著。(3)昼夜温湿度变化对药效的影响:早晨和中午喷药,喷药时和喷药后的温湿度变化不同,直接影响各种药剂对叶甲的药效速率,但在一定温度范围内(20—25℃)对最后死亡率影响不大。

Abstract:The effect of insecticides are closely related to the composition of population and different physiological states of elm leaf beetle(Galerucella aeneseens F.)and to temperature and humidity changes in the field. (1) The insecticidal resistance in different physiological states is as follows:(a).larval stage—lst instar<2nd instar<3rd instar<ripe larval;(b),adult stage—newly emerging adult<over wintering adult in flight period<adult in stage of supplement of nutrjtion<adult in the preparatoryperiods for passing summer. (2) Influence of seasonal changes on temperature on insecticidal efficiency:at lower temperature,DDT have quicker killing effect and stronger in efficiency than Dipterex and vice versa;at higher temperature,effect of Rotenone a little weaker than that of Dipterex,although they are similar in nature. (3) Influence of diurnal changes in temperature and humidity on insecticidal effifiency:spray was made in the morning and at noon when temperatures and humidities were reversed respectively.During and after spraying the temperature and the humidity have a direct effect on killing speed of various insecticides,however,within certain range of temperature(20—30℃),it has little influence on final mortality.

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