矢尖蚧发生动态及其综合防治研究

ON THE POPULATION DYNAMICS AND INTEGRATED CONTROL OF ARROWHEAD SCALE

矢尖蚧Unaspis yanonensis Kuwana在福建省中北部北纬26度地带生活史观察结果:1年发生3代,少数4代,以雌成虫和部分若虫越冬。4月中旬气温达18℃左右时开始产卵繁殖。各代一龄幼蚧发生高峰期:第一代在4月下旬; 第二代7月上、中旬,并开始世代重叠;第三代9月上旬至10月上旬;12月有部分第四代幼蚧出现。全年以第一代幼蚧发生量最多。冬季剪除受害严重的虫枝;在第一代幼蚧高峰中后期喷药1—2次;第二代剪除遗漏的局部重害虫枝和用药剂挑治幼蚧后,移殖日本方头甲Cybocephalus nipponicus,能很好地控制矢尖蚧的发生为害。

The arrowhead scale Unaspis yanonensis Kuwana is one of the im-portant citrus insect pests.There are three generations,with four gen-erations in minority,a year in norther-central Fujian Province.It over-winters with females and a part of larvae,and begins to lay eggs atabout 18℃ in middle April.The occurrence peak stages of first nymphinstar are late April in lst generation,early to middle July in 2nd ge-neration,early September to early October in 3rd generation,and somenymphs of 4th generation may occur in December,with generationoverlaps since July.The nymph of lst generation is most abundant. A series of control measures such as to remove the severely.dam-aged twigs in winter,to spray one to two times in middlelate period ofpeak nymph stage of lst generation,to spray selectively for controllingthe nymph of 2nd generation,and to inoculate Cybocephalus nipponicus,an important predator of this scale,are all available approaches toIPM.