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近几年来，新干县大部分桔园为了防治柑桔锈壁虱的危害，年打药的次数５次以上，而且效果不理想，究其原因，本人谈几点看法：１ 铜制剂使用次数偏多自从１９９１年大冻以后，疮痂病发生严重，幼果染病，造成６月份大量落果。为防治此病，很多果园连续多次使用波尔多液等铜制
In recent years, most of the orange orchard in Xingan County in order to prevent citrus rust ticks, the number of drug hit a year more than 5 times, and the effect is not satisfactory, the reason, I talk about a few views: 1 copper preparations used number of times Many since the frozen in 1991, the scab disease serious, young fruit disease, resulting in a large number of fruit drop in June. To control the disease, many orchards repeatedly used Bordeaux mixture and other copper