紫薇长斑蚜发生特点与防治

A Study of Characteristics and Control of Tinocallis kahawaluokalani(Hemiptera:Drepanosiphidae)

紫薇Lagerstroemia indica是广泛栽培的重要园林景观植物,紫薇长斑蚜Tinocallis kahawaluokalani危害较为严重。通过室内饲养、田间监测和综合防治,明确了紫薇长斑蚜的发生特点,比较了几种措施的防治效果。结果显示:(1)紫薇长斑蚜每头成虫平均产若蚜(23.7±2.4)头,世代平均历期(7.3±0.5)d,成虫平均寿命(6.7±0.5)d;(2)紫薇长斑蚜全年均可发生,春末夏初是盛发期,种群数量在4月中下旬和5月上中旬达到高峰,危害部位是叶片;(3)六斑月瓢虫Menochilus sexmaculata、农用植物油和吡虫啉能够较好控制紫薇长斑蚜,但六斑月瓢虫起效时间滞后,至第3周达最好的防效88.22%。农用植物油和吡虫啉见效快,第1周的防效分别为80.69%和91.60%,之后逐渐下降,有效防控时间短。

Lagerstroemia indica is an important landscape plant widely cultivated in Guangzhou.Tinocallis kahawaluokalani is a very serious pest on L.indica.The occurrence characteristics were defined,and the control effects of several measures were evaluated by breeding,wild survey,and control research.(1)Each adult produced 23.7±2.4 nymphs on average.The generation period was 7.3±0.5 days,and the lifetime of adults was 6.7±0.5 days.(2)The T.kahawaluokalani occurs throughout the year,especially in late spring and early summer,and reaches its peak of population in mid-late April and early May.The leaf of L.indica was the main target of the pests.(3)Menochilus sexmaculata,agricultural plant oil,and imidacloprid could effectively control the T.kahawaluokalani.However,the onset time of ladybird was delayed,and the highest control rate of 3rd week was 88.22%.The effective control time of the other was fast but short.The control rate of agricultural plant oil and imidacloprid in the first week was 80.69%and 91.60%,respectively.