Abstract:
Objective The field control of Bactrocera dorsalis by artificial propagation with Diachasmimorpha longicaudata was studied.
Method In the experiment, a release zone and a control zone were set up, and three releasing points were set in the release zone. The artificially propagated D. longicaudata was released according to the ratio of 1:10 of the 2nd and 3rd instar larvae of the female bee and B. dorsalis. Through biological observation experiment, the field parasitic rate and colonization of the artificially propagated D. longicaudata to B. dorsalis were studied.
Result Artificial releasing of D. longicaudata could rapidly increase its parasitism rate in the field, reaching 5.97% on average, with the ratio of male to female close to 1. However, with the passage of time after releasing, the parasitic rate and the ratio of male to female decreased gradually, and the emergence rate of B. dorsalis increased gradually.
Conclusion The D. longicaudata (Ashmead) is an important parasitic wasp for B. dorsalis larvae, and increasing its population in the field by artificial means is one of the important means in biological control at present. However, artificially propagated parasitic wasps are usually a large number of indoor population. Due to the complex field environment, their adaptability, parasitism rate and sex ratio in the field need further research.
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