冷藏对松毛虫内茧蜂影响的研究

Studies on the Effects of Cold Storage on Aleiodes dendrolimi (Matsumura)

根据1987～1989年研究,松毛虫内茧蜂可在5±1℃条件下冷藏4～5个月,对成虫羽化率、成虫寿命、成虫交配产卵均无不良影响,并可杀死重寄生蜂。冷藏时间长,成虫羽化日期提前,羽化期缩短。人工引迁时应用冷藏方法,可根据松毛虫发生期调节冷藏时间,做到适期出蜂,及时释放。也可防止将重寄生蜂带入另一地区。

Aleiodes dendrolini (Matsumura) is an important braconid parasite of pine caterpillars (Dendrolimus spp.) in China. This paper reports the results of cold storage study in 1987~1989. The experimental materials were collected from Fengning, Xinglong Counties, Hebei Province, and Ningcheng County, Nei Mongol Autonomous Region from early March to 20th April. Some of the hosts parasitized by Aleiodes were placed in a refrigerator at 5 ±1℃: and the others in the laboratory under room temperature. The resultes are as follows: (1) There was no difference in the emergence rate and life-span of adult between Aleiodes dendrolimi which have been cold stored for 4~5 months and those of the checks (untreated). (2) The emergence periods of adults were influenced by the duration of cold storage. The longer the duration of cold storage, the earlier the beginning date of emergence and the shorter the duration of emergence. (3) Adults of Aleiodes would mate and oviposit normally after cold storage.(4) All of the hyperparasites were killed after cold storage for 4~5 months. When Aleiodes were immigrated from one location to other, cold storage method can be used for safety and effectiveness purposes.