商南县板栗林淡娇异蝽发生危害与防治技术

Harm of Urostylis yangi to Chestnut Forest in Shangnan and Control Technology Concerned

淡娇异蝽主要危害板栗、茅栗等经济树种,严重时可使板栗、茅栗减产,野生茅栗林成片死亡。为保护商南县板栗产业健康发展,对该县板栗林淡娇异蝽发生及防治技术进行了试验研究,结果为商南县全县10个镇(街道办)中8个镇有淡娇异蝽发生危害;不同防治措施的防治率为初冬清除销毁或深埋杂草杂灌及落叶、耕翻土壤80.0%,喷施4.5%高效氯氟氢菊酯2500~3000倍液为94.2%,喷施10%吡虫啉5000~6000倍液为95.5%,喷施4.5%高效氯氟氢菊酯4000~4500倍+10%吡虫啉6000~8000倍混合液为99.1%,防治效果都较好;建议采取初冬清除销毁或深埋杂草杂灌及落叶、耕翻土壤,春季幼虫期或若虫期雾状喷施4.5%高效氯氟氢菊酯或10%吡虫啉混合液喷雾,也可与杀菌剂、叶面肥混合使用。

Urostylis yangi mainly attacks Castanea mollissima and C.seguinii to serious degree which the whole castanea forest growth would decline or die.To control Urostylis yangi and promote castanea forest development on a healthy way,experiments were conducted in Shangnan castanea forest of Shaanxi province with a comparative design.The result showed that eight out of ten townships in Shangnan has epidemics of Urostylis yangi and different control measures generated different effects:winter cleaning plus deep bury of foliage could have control effect of 80.0%,spray of 4.5%beta-chlorofluthrin at 2500 to 3000 times could have control effect of 94.2%,spray of 10%imidacloprid at 5000 to 6000 times could have control effect of 95.5%,spray of mixed solution of 4.5%Beta-chlorofluthrin at 4000 to 4500 times plus 10%of imidacloprid at 6000 to 8000 times could have control effect of 99.1%.It is highly recommended that winter cleaning,bury of foliage,deep plowing and spray of mixed solution of 4.5%beta-chlorofluthrin and 10%of imidacloprid could have best control effect.