息烽县是贵州省重要水果基地县之一,近年已种植柑桔苗100多万株。由于栽培技术管理工作跟不上,柑桔苗遭受白蚁及黄蚂蚁严重危害,柑桔幼树根颈及土层杂物覆盖的主干皮层被啃食,轻者长势削弱,重者叶片发黄,以至全株枯死。柑桔蚁害的发生期主要在5—9月,以7—8月为害最重,8—9月枯死现象严重。据调查,以定植过深,土面高过嫁接部位的幼树受害最严重;定植深度合理,植株露根亮颈者不遭蚁害。定植后1—3年的幼树受害株率一般达5—10％左右,枯死率达3—5％,严重者受害株率高达15—20％,枯死率达5—10％。定植后5—6年以 Xifeng County is one of the important fruit base counties in Guizhou Province. In recent years, more than 1 million citrus trees have been planted. As the management of cultivation techniques can not keep up, citrus seedlings suffer from termites and yellow ants seriously endanger the roots of citrus young roots and soil debris covered by the main cortex is eating, the weakening of the weak, heavy yellow leaves, And the whole plant died. The occurrence of citrus ants damage occurs mainly in May-September, the most serious damage in July-August, August-September dead serious. According to the survey, young trees with over-depth planting and high soil-over-grafting sites suffered the most serious damage. The planting depth was reasonable and the plants with exposed roots and bright neck were not affected by ant infestations. Planting 1-3 years after sapling plant damage rate is generally about 5-10%, the mortality rate of 3-5%, in severe cases victimized strains as high as 15-20%, the mortality rate of 5-10%. 5-6 years after planting