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香蕉象鼻虫是钻蛀为害香蕉的主要害虫,常年为害率10％左右,严重影响香蕉产量。五十年代到七十年代初期,应用6％666可湿性粉剂防治,效果显著,但七十年代后期起,可能是抗性虫体的产生,该药剂的杀虫效果不显著了。为了探求更为适合的药剂防治香蕉象鼻虫,我们选用美国陶氐化学公司出品的乐思本(Lorsban)进行防治香蕉象鼻虫的试验。试验在我场赤岗作业区进行。试验地分别为新植香蕉和多年生香蕉。使用乐思本的浓度为0.125、0.25和0.375％有效成分,各分别作土面及叶茎喷施。新植蕉由1980年5月至1981年6月每隔3个月施药1次,共施药5次;多年生蕉由1980年7月至1981年4月共施药4次。试验结果: (一)0.125、0.25和0.375％有效成分乐思本茎叶处理的,其防效分别为94—100％、100％和70—100％。在此需要加以说明的是,
Banana weevil is the main pest infestation of bananas, perennial damage rate of about 10%, seriously affecting the yield of bananas. From the 1950s to the early 1970s, 6% 666 wettable powder was used to prevent and control pests. The effect was remarkable. However, since the late 1970s, the generation of resistant pests may be caused. The insecticidal effect of the pesticide is not significant. In order to find a more suitable agent for banana weevil control, we chose Lorsban produced by Tao Tao Chemical Co., Ltd. to control banana weevil. Test in my field Chigang operation area. Tests were newly planted bananas and perennial bananas. The use of music concentration of 0.125,0.25 and 0.375%, the active ingredient, respectively, for soil and leaf stem spray. The newly planted banana was applied once every three months from May 1980 to June 1981 for 5 times. Perennial banana was co-administered 4 times between July 1980 and April 1981. Test results: (A) 0.125,0.25 and 0.375% active ingredients Leicester stems and leaves treatment, the control effect was 94-100%, 100% and 70-100%. What needs to be explained here is that,