桂中、桂南蔗区甘蔗条螟卵寄生蜂调查

Investigation on egg parasitoids of Chilo sacchariphagus Bjojer in sugarcane planting areas of central and south Guangxi

【目的】明确广西不同生态蔗区甘蔗条螟卵优势寄生蜂种类及寄生情况,为保护本地优势自然天敌及人工释放控制蔗螟提供理论依据。【方法】通过田间采样调查及室内饲养观察,对广西3个代表性蔗区南宁市吴圩镇、崇左市濑湍镇和来宾市武宣县甘蔗条螟卵寄生蜂种类及优势种进行调查。【结果】3个蔗区条螟卵寄生蜂主要有螟黄赤眼蜂和黑卵蜂两种,其中,崇左市濑湍镇蔗区黑卵蜂对条螟卵块和卵粒寄生率分别为52.11%和45.32%,螟黄赤眼蜂分别为19.72%和17.04%;南宁市吴圩镇蔗区黑卵蜂对条螟卵块和卵粒寄生率分别为1.79%和2.40%,螟黄赤眼蜂分别为8.93%和6.29%;来宾市武宣县蔗区黑卵蜂对条螟卵块和卵粒寄生率分别为5.13%和6.36%,螟黄赤眼蜂分别为43.59%和41.75%。【结论】黑卵蜂是崇左市濑湍镇甘蔗条螟卵寄生性优势天敌,螟黄赤眼蜂是来宾市武宣县和南宁市吴圩镇甘蔗条螟卵寄生性优势天敌。

[Objective]Dominant egg parasitoid types and their growth situations of Chilo saeehariphagus Bjojer in sugarcane growing areas of Guangxi were determined to provide references for safeguarding superior natural enemies and artificially controlling Chilo saeehariphagus Bjojer. [Method ]Egg parasitoid types and its dominant species of Chilo sacchariphagus Bjojer were investigated using field sampling and indoor breeding in typical sugareane planting areas including Wuxu Town of Nanning City, Laituan Town of Chongzuo City and Wuxuan County of Laibin City. [Result ]The results showed that there were mainly two kinds of egg parasitoids, Triehogramma chilonis Ishii and Telenomus sp., in three sugarcane planting areas. The parasitic rate of Telenomus sp. in egg-masses and eggs of Chilo sacehariphagus Bjojer in Laituan Town of Chongzuo City was 52.11 and 45.32%, respectively, and that of Triehogramma ehilonis was 19.72 and 17.04%, respectively. In Wuxuan County of Laibin City, the parasitic rate of Telenomus sp. in egg-masses and egg was 1.79 and 2.40%, and that of Triehogramma ehilonis was 8.93 and 6.29%, respectively. And in Wuxuan Town of Laibin City, the parasitic rate of of Telenomus sp. in egg-masses and eggs was 5.13 and 6.36%, and that of Triehogramma ehilonis was 43.59 and 41.75%, respectively. [Conclusion]Telenomus sp. was the dominant natural parasitical enemy of Chilo saechariphagus Bjojer in Laituan Town of Chongzuo City, while Trichogramma ehilonis was the dominant natural parasitical enemv in Wuxuan Town of Laibin City and Wuxu Town of Nanning City.