Abstract:

Trissolcus halyomorphae Yang and Anastatus sp.are the important natural enemy to parasitize eggs of Halyomorpha halys(St?l). Interspecific competition between two parasitoids were investigated at 26℃ in the laboratory.Both parasitoids could lay eggs into host eggs previously parasitized by the other species,leading to occurrence of multiparasitized eggs.When host parasitized by T. halyomorphae ≤4 days were exposed to Anastatus sp.,nearly all ensuing parasitoid adults from the multiparasitized host eggs were Anastatus sp.,and host parasitized by T. halyomorphae ≥6 days,T. halyomorphae emerging almost. When host parasitized by Anastatus sp.≤one day were exposed to T. halyomorphae,most of the ensuing parasitoid adults from the hosts were T. halyomorphae. When eggs parasitized by Anastatus sp≥2 days were exposed to T. halyomorphae,nearly all Anastatus sp adults from the multiparasitized host eggs.The two egg parasites prefers ovipositing in fresh eggs to old ones,and percentage of adult emergence highly. When egg age ≥4 days,a few adult could emerge.The last ten-days of June and the first ten-days of August were the peak periods of T. halyomorphae.There were Anastatus sp adults from the first ten-days of June to the middle ten-days of August.They decreased on the first ten-days of Sept..