Outbreaking Regularity of Atrijuglans hetauhei and Its Comprehensive Control Techniques

Based on outdoor and indoor observation,the outbreaking regularities of Atrijuglans hetauhei and its comprehensive control techniques were investigated.It was found that A.hetauhei had one generation only at mountain area with the altitude of over 1 000 meters,in Danfeng County,Shaanxi Province,China.However,one to three generations were observed at the gully region with a altitude below 600 meters.The control techniques were suggested: to plow the soil layer of 10～15 cm around the tree roots,the rate of fruit infected by pest would reduced to 2.04%～8.40%,based on the observation that the overwinter larvae were found in the soil layer with a depth of 1～9 cm.In the periods of the pest emergence,oviposition,and worm fruit-boring,to spray Fungus-Bacillus thuringiensis 32 000 IU·mg-1 diluted by 1 000 times,or Fungus-Beauveria bassiana with a concentration of 50 billion·mg-1 twice on the infected tree,the rate of fruit infected by pest would reduced to 10.31% and 17.63% respectively.