花绒寄甲在同海拔不同时间释放对松褐天牛寄生效果试验研究

The parasitism rate of Dastarcus helophoroides on Monochamus alternantus in the same altitude at different time

在海拔800m处通过松褐天牛危害木段林间罩网接入花绒寄甲寄生试验,结果表明:2014年5月28日释放的花绒寄甲卵对松褐天牛平均寄生率为75%,明显高于2015年5月10日的45.5%;2015年5月20日释放的花绒寄甲成虫平均寄生率为69.3%,高于5月30日的51.1%。为提高当年花绒寄甲释放的寄生效果,在泰安地区生产上规模应用花绒寄甲,在海拔800m左右松褐天牛发生的林分,卵首次释放时间可在5月下旬末,成虫在5月中下旬。

The parasitism test was carried out through Dastarcus helophoroideson Monochamus alternantusfrom infested log of forest in field mesh at an altitude of 800 meters .Results showed that, the average parasitism rate ofD.helophoroides eggs released was 75% on May 28 in 2014, significantly higher than 45.5% on May 10 in 2015; the average parasitism rate of D.helophoroides adults released was 69.3% on May 20 in 2015, higher than 51.1% on May 30 in 2015.In order to improve the parasitic effects,D. helophoroides eggs was released tothe forest infested by M.alternantusfor the first time at the end of the late may,adults in the mid to late may in the forest infested taian area at an altitude of 800 meters or so.