【摘要】 咖啡黑小蠢是近年在兴隆华侨农场严重危害中粒种咖啡的重要害虫。据1989年对4—5年生咖啡树调查,植株受害率100％,枝条受害率29.7—82.5％,虫害枯枝率7.65—17.8％。该虫以雌成虫钻蛀咖啡枝条为害,幼虫和成虫取食蛀道壁上的真菌菌丝。田间种群数量通常在3月上旬开始剧增,3月中下旬为高峰期,7月至10月田间虫口极少,11月以后逐渐有虫口及虫枯枝出现。温度是影响虫口波动的主要因素。2.5％溴氰菊酶、25％杀虫双、40％乐菊酯各兑水1000倍对成虫直接触杀效果显著,死亡率均为100％。48％乐斯本、40％氧化乐果400—800倍液等12种杀虫剂田间喷雾对咖啡枝条蛀洞内的成虫、蛹、幼虫防效均不明显。更多还原

【Abstract】 A study was carried out at Xinglong Hua Qiao Farm, Hainan Province during 1989-1992 on the population dynamics and chemical control of xyle-borus morstatti Hagedorn on coffea robusta. The insect is an important borer in Central and East Hainan. The female adults bore into shoots, twigs and small branches, causing serious damages, and its larvae and adults feed on ambrosia fungus growing on the wall of the brood chamber, A 1989 field investigation on 4 - 5 years old coffea trees revealed a damage rate of 29.7 -82.5% and die-back rate of 7.65-17.8%.The field population, emerging in early January, increased sharply in early March, reached its peak in mid/late March and then fall drastically from late April, From July to December, the population could hardly be found in the field.Direct exposure of the adults to the sprays of 0.0025% decamethrin, 0.025% Shachongshuang or 0.04%Lejuzhi showed a 100% mortality.However, all the insecticides for trial, when field sprayed on affected branches, did not display any significant efficiency in killing the adults, pupae, larvae and eggs present in the boring holes. Effective insecticidal spray is recommended at the time when the insects move about out of the holes.更多还原