柿绒粉蚧的发生规律及防治

柿绒粉蚧(柿绵蚧)Eriococcus kaki Kuwana在广西灌阳县1年发生6代,以若虫和成虫在树干裂皮缝、缝隙,1、2年生枝条轮痕、芽基、芽鳞片及干柿蒂上越冬,次年柿树萌芽期开始活动。第1代～第6代低龄若虫高峰期分别为3月下旬～4月上旬初、5月下旬末～6月上旬初、6月下旬末～7月上旬初、8月上旬～中旬初、9月上旬初～中旬初及10月中旬初～11月上旬初。卵期7～18d,若虫期22～136d,成虫期6～140d。柿芽萌动前用99.1%机油乳剂180倍液(敌死虫)或20%松脂酸钠(融杀蚧螨)150倍液清园喷杀,防治效果分别达88%、79.8%。第1代低龄若虫高峰期用40%毒死蜱乳油1000倍液加25%噻嗪酮(扑虱灵)可湿性粉剂1500倍液喷雾,防治效果99.6%,80%敌敌畏乳油800倍液加10%吡虫啉可湿性粉剂2000倍液防治效果达99.1%,3%啶虫脒可湿性粉剂(3%金世纪)2500倍液防治效果99.5%。

Occurrence of Eriococcus kaki and its control

Gum scale, Eriococcus kaki Kuwana, is a serious pest damaging persimmon in Guanyang County, Guangxi Province. There are six generations per year. The peak periods of young nymphs ineach genaration from the first to sixth were the last of March to early of April, the last of May to early of June, the last of June to early of July, the early and middle of August, the early and middle of September, the middle of October to the early of November, respectively. The egg stage was 7 - 18 days, nymph stage was 22 - 136 days and adult stage was 6 - 140 days. The machine oil emulsion or sodium abietate had been recommended spraying before persimmon bud stage the experimental results showed that the effectivencess of spraying 40% chlorpyrifos EC with 25% buprofezin or 80% dichlorvos EC with 10% imidacloprid WP or 3% acetamiprid WP. was more than 99% to control young nymphs of first generation.