Influences of Saccharides Supplementation on Parasitic Efficiency of Dominant Parasitic Natural Enemy of Stored Grain Pest,Habrobracon hebetor Say(Hymenoptera:Braconidae)
Biological control of stored grain pests by using dominant parasitic natural enemies is one of the impor-tant strategies to address the challenge of chemical control.Saccharides supplementation is an effective way to expand parasitic wasp populations and enhance their parasitic efficiency.Glucose,sucrose,and honey were investigated as supplementary nutrients for the newly emerged Habrobracon hebetor Say(Hymenoptera:Braconidae)with different mass fractions(10％,20％,30％,40％and 50％).The parasitism rate of the hosts,the number of eggs laid by H.hebetor,and emergence rate of H.hebetor were calculated within 5 days,and the type and mass fraction of sugar sources that were most conducive to the parasitism of H.hebetor were identified.The results indicated that glucose,sucrose,and honey could significantly improve the parasitism rate of H.hebetor in short term at 30％,10％,and 20％,respectively.The total number of eggs laid by H.hebetor was the highest within 5 days when the glucose,su-crose,and honey supplied at 30％,10％and 50％,respectively,and there was no significant difference among the three sugars.When glucose,sucrose,and honey were supplied at 20％,30％,and 40％,the highest emergence rates were observed in the offspring of H.hebetor,being 92.26％,83.90％,and 78.80％,respectively.Glucose solution can effectively increase the parasitism rate of H.hebetor in the early stage after release when supplied at 30％,and the effectiveness was stable.Therefore,using glucose solution at 30％as a supplementary nutrient before the release of H.hebetor could effectively improve their parasitic efficiency.
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