油柰桑白盾蚧生物学及其防治

Biology and control of Pseudaulacaspis pentagona on oil nane.

桑白盾蚧Pseudaulacaspispentagona(Targioni Tozzetti)是油柰树主要害虫之一 ,在福建省古田县 1年发生 4代 ,以受精雌成虫固着在枝条上越冬。翌年 4月上旬 ,当日平均气温达 1 7℃左右时开始产卵繁殖。各代幼蚧发生高峰期 ,第 1代在 4月中下旬 ;第 2代 7月上中旬 ,并开始世代重叠 ;第 3代 9月上中旬 ;第 4代 1 0月下旬 ,全年以第 1代幼蚧发生量最多。冬季剪除受害严重的虫枝 ,并于第 1代幼蚧高峰中后期喷药 1～ 2次 ,结合移殖天敌进行生物防治 ,能很好地控制该蚧发生为害。

White peach scale, Pseudaulacaspis pentagona (Targioni\|Tozzetti),is one of the key insect pests on oil nane tree.It has four generations a year and overwinters as impregnated adult female on the brunches of oil nane under conditions in Gutian County,Fujian Province.The female begins to lay eggs when mean temperature is up to 17℃.The period of larva population peak of each generation occurs separately in the early and middle of April, July, September and the last of October.Generations begin to overlap from the second generation.The population of the first generation is higher than that of others.In this paper the control methods,including winter\|clipping,spraying pesticides and plantation of natural enemies are suggested.