【摘要】 <正> 自从Saunder1882年在加拿大首次进行赤眼蜂释放试验以后,相继在欧洲、亚洲和美洲的一些国家开展了赤眼蜂的研究工作,并广泛地应用于防治棉、粮、糖、果、林和蔬菜等作物害虫,取得了不少成功的经验。我国早在三十年代浙江省就对赤眼蜂的生物学特性进行了试验;1936年广东等地利用赤眼蜂防治甘蔗螟做了试验;五十年代赤眼蜂在广东广西等地大面积推广应用于防治甘蔗螟和玉米螟等害虫;六十年代以来,赤眼蜂的利用研究在我国蓬勃地发展起来,防治对象不断扩大,已用赤眼蜂来防治棉铃虫、水稻纵更多还原

【Abstract】 1 Acceding to the physiological requirements and the external characteristics, the distinguishing standards of the embryonic developmental stages can be designed. After the embryo has completed its development, it begins to take food which indicates it enters the larval stage. When the dark spots appear on the dorsal abdomen the larva enters the prepupal stage. In the larval stage, three sub-stages may be divided, i.e., earlier larval stage, mid-larval stage and later larval stage.2. Under the various constant temperature conditions carried out in the laboratory, the biological constants arc computed as follows;Stage Threshold for development Thermal constan t(.C) (C t) (K) (Day degree)Egg 5.34 31.28Larva 5.82 51.85Prcpupa 11.03 29.62Pupa 12.06 44.40Complete 157.1duration更多还原