【作者】 谭炳林； 黄明度； 梁嘉伦；

【Author】 Tan Binglin Huang Mingdu (Guangdong Entomological Insitute) Liang Jialun (Guangzhou Agricultural Bureau)

【机构】 广东省昆虫研究所； 广州市农业局植保总站；

【摘要】 1986～1988年在广州市郊试验甜橙受桔全爪螨为害后对生长发育的影响,植株的补偿功能以及产量损失。结果表明,甜橙对桔全爪螨春梢种群具有较强的补偿能力,对秋梢种群补偿能力则较弱。根据广州地区的生产水平,求得桔全爪螨的经济损害水平:春梢种群为每叶21头成、若螨(高峰期);秋季种群为每叶11头成、若螨(高峰期)。并求出静态的和在不同捕食螨数量下桔全爪螨的动态经济阈值。更多还原

【Abstract】 Three basic experiment which include the growth and development of citrus,the ability of citrus to compensate for damage by the red mite,the loss of citrus yield caused by the red mite were undertaken from 1986 to 1988 in Guangzhou suburb.The conclusion were as follow: 1.With the increase of damage level,the loss of chlorophyll becomes bigger. However,the content of thlorophyll should be recoverd in 2-4 months after leaves damaged by citrus red mite,when the damage was withen a definite level.This case was more obvious in spring leaves then that in autumn leaves. 2.When the damage level of spring leaves reached 30%and the damage level of autumn leaves reached 20%.the weight loss in fruit and redution in fruit-bearing rate were statistically significant rcspectively.The definite function relation between the rate of loss and the damage level were as follow: Sping leaves: (?) Autnmn leaves: (?) Based on the result mentioned above,the conclusion could be given:the compensation ablity of sweet orange to the damage caused by population of citrus red mite is stonger then that to the autumn population. 3.According to the productive level in Guangzhou suburb,the average economic injury level(EIT) is set at 21.0(on spring tender shoot) and n.0(on autumn tender shoot) larvae or adult mites per tender leaf.By similating the population growth of the pest day by day,the average economic threshold(ET) was obtained:8-10(spring) and 6-7(autumn) larvae or adult mites per tender leaf.Under the same period and various dentisities of predators(Amblyseius newsami Evans and A.nicholsi E.et L.),the dynamic ET increases with the increasing number of predators(table 9)更多还原