绿化柿树柿绵蚧的发生规律及药剂防效研究

目的]评价几种药剂对绿化柿树柿绵蚧的防治效果。方法]介绍了绿化柿树柿绵蚧的形态特征及生活习性,并研究了4种药剂对绿化柿树柿绵蚧的防治效果。结果]柿绵蚧在云南玉溪绿化柿树上1年发生5代,以低龄若虫在树裂缝、粗皮缝隙、叶痕、枝条轮痕等处越冬,翌年立春后,柿子新梢长出小叶时开始出蛰,爬到新梢、嫩芽、叶柄、叶背处为害。田间药效试验表明,药后3 d,480 g/L毒死蜱EC、2.5%高效氯氰菊酯EC和对照药剂90%敌百虫原药的防效分别为85.57%、70.45%和71.59%,均达到显著和极显著差异;药后15 d,480 g/L毒死蜱EC、240 g/L亩旺特SL、2.5%高效氯氰菊酯EC的防效分别为90.24%、85.66%和84.37%,和对照药剂90%敌百虫原药的防效相比均达显著差异;药后35 d,480 g/L毒死蜱EC、240 g/L亩旺特SL与对照药剂90%敌百虫原药的防效相比达到显著和极显著差异。结论]选择480 g/L毒死蜱EC 5 000倍液或240 g/L亩旺特SL 2 500倍液进行喷雾来防治绿化柿树柿绵蚧,可达到较理想效果。

Occurrence Law and Control Effect of Acanthococcus kaki on Landscaping Persimmon

Abstract Objective ] The aim was to evaluate control effects of several reagents against Acanthococcus kaki on landscaping persimmon. Method] The morphological characteristics and life habit of A. kaki on landscaping persimmon were introduced, and the control effects of four reagents against A. kaki in field were studied. Result] A. kaki occurred in landscaping persimmon five generations per year in Yuxi, Yun- nan. Young pest lived through the winter in tree cracks, in the coarse skin cracks, in the leaf scar, in the stick round marks, etc. After the spring came in the following year, A. kaki started to damage new shoots, tender shoot, leaf stalk and blade back when new shoots started to grow lobule. The control effects of 480 g/L Chlorpyrifos EC, 2.5% Beta-cypermethrin EC and 90% Trichlorfont were 85.57%, 70.45% and 71.59% in three days after treatment. The control effects of 480 g/L Chlorpyrifos EC, 240 g/L Movento SL and 2.5% Beta-cypermethrin EC were 90.24%, 85.66% and 84.37% in 15 days after treatment, which were significantly different with that of 90% Trichlorfont. After 35 days, The control effects of 480 g/L Chlorpyrifos EC, 240 g/L Movento SL and 90% Trichlorfont achieved significant and extremely significant difference. Conclusion] It is suggested that 480 g/L Chlorpyrifos EC 5 000 times liquid and 240 g/L Movento SL 2 500 times liquid are suit- able to control A. kaki on landscaping persimmon.