Studies on the Occurrence and Biological Control of Diplocarya Batsch in the Desert Steppe of Hexi Corridor
In addition to the investigation on the number,activity and damage of different stages and instars of the beetle,the control effects of 5 biological agents including 1.8％Avermectin,1.2％nicotine-matrine EC,3％hypertonic fenoxycarb,25％methylurea No.3 SC and 50000 IU MG-1 Bacillus thuringiensis were com-pared,the results showed that there were three generations in one year in Minqin,and the control should be carried out in the peak oviposition period of overwintering adults in mid-to-late may or in the second larva period in mid-to-late July.Considering the economic cost and control effect,the above 5 traditional Chinese medicines can be used alternately in practice.The use of 1.2％matrine 2000-fold solution and 3％Fenoxycarb 3000-fold solution is recommended when the hazard degree is high,at lower risk,use 1.8％Avermectin 1,000-fold solution,50 000 IU mg-1 bacillus thuringiensis 1,000-fold solution,or 25％Miyurea 31,000-fold solution.
desert grasslanddiorhabda rybakowibiological control
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