以生物防治为主持续治理中华稻蝗的初步研究

1～3龄蝗蝻主要聚集于田埂、地头取食杂草，随后逐渐扩散到稻田内，4～6龄蝗蝻在稻田内趋于均匀分布。卡死克对中华稻蝗的致死中浓度(LC₅₀)为54.27 μg/mL，田间用５%卡死克^®水剂喷雾防治，以105 mL/hm²为最佳用量。卡死克与蝗虫微孢子虫协调应用于防治高密度稻蝗时，两者以２∶１的比例进行地毯式喷施效果最佳，当年感染微孢子虫的蝗虫达35.6%。这种防治措施费用低，持效期长，在持续性综合治理稻田蝗害中有很好的应用前景。

A preliminary investigation on sustainable management of Oxya chinensis (Thunb.) mainly with biological agents

Distribution of Oxya chinensis was investigated in rice field and the result indicated that 1～3 instar nymphs mainly gathered on weeds around the field. When they grew up to 4～6 instars, the nymphs gradually dispersed into the field. The laboratory experiments showed that the LC₅₀ of 5% Cascade^® (IGR) against the grasshoppers was about 54.27 μg/mL. The optimum dosage for field spraying was estimated at 105 mL/hm². When high density of the insect pest occurred, the integrated application of Nosema locustae and IGR was effective and more than 35.6% of the surviving grasshoppers were infected by N. locustae. This is a low cost and sustainable measure with good prospects in practical application.