Huang J, Hua H-Q, Wang L-Y, Zhang F, Li Y-X
Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
Bull Entomol Res. 2017 Dec;107(6):812-819. doi: 10.1017/S0007485317000335. Epub 2017 Apr 11.
In laboratories, the parasitism rate of Ostrinia furnacalis (Güenée) (Lepidoptera: Crambidae) eggs by Trichogramma dendrolimi Matsumura (Hymenoptera: Trichogrammatidae) is low; however, efforts to control O. furnacalis with T. dendrolimi in the field have been successful. In this study, the effects of the number of attacks by T. dendrolimi against O. furnacalis eggs and diet of O. furnacalis larva on wasp development were investigated. The results indicated that more attacks increased significantly not only the successful parasitism rate of O. furnacalis eggs by T. dendrolimi, but also the percentage of host eggs that failed to develop into either O. furnacalis larvae or T. dendrolimi. Both the size and female proportion of T. dendrolimi offspring decreased as the number of attacks increased. The number of T. dendrolimi eggs laid in per host egg increased significantly as the ratio of wasps to host eggs increased from 1:5 to 3:5. Host diet also significantly affected the developmental time of immaturity and the emergence rate of adults of T. dendrolimi. These results illustrate how inundative releases of T. dendrolimi can successfully control O. furnacalis despite the fact that pest parasitism by the subsequent wasp generation decreases sharply in the field. The suitability of O. furnacalis eggs to T. dendrolimi and the superparasitism effects on offspring of T. dendrolimi are discussed.
在实验室中，松毛虫赤眼蜂（Trichogramma dendrolimi Matsumura，膜翅目：赤眼蜂科）对亚洲玉米螟（Ostrinia furnacalis (Güenée)，鳞翅目：草螟科）卵的寄生率较低；然而，在田间利用松毛虫赤眼蜂防治亚洲玉米螟已取得成功。本研究调查了松毛虫赤眼蜂对亚洲玉米螟卵的攻击次数以及亚洲玉米螟幼虫的食物对该蜂发育的影响。结果表明，更多的攻击不仅显著提高了松毛虫赤眼蜂对亚洲玉米螟卵的成功寄生率，也增加了未发育成亚洲玉米螟幼虫或松毛虫赤眼蜂的寄主卵的比例。随着攻击次数增加，松毛虫赤眼蜂子代的大小和雌性比例均下降。当蜂与寄主卵的比例从1:5增加到3:5时，每个寄主卵上的松毛虫赤眼蜂产卵数显著增加。寄主食物也显著影响松毛虫赤眼蜂未成熟期的发育时间和成虫羽化率。这些结果表明，尽管后续蜂代对害虫的寄生率在田间急剧下降，但大量释放松毛虫赤眼蜂仍能成功防治亚洲玉米螟。本文还讨论了亚洲玉米螟卵对松毛虫赤眼蜂的适合性以及过寄生对松毛虫赤眼蜂子代的影响。
