Abstract: 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.

Key words: Oxya chinensis, biocontrol, Cascade, Nosema locustae, integrated application