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９９０Ａ植物抗病剂防治苹果树腐烂病试验供试药剂为＂桑兰牌＂９９０Ａ植物抗病剂，以４０％福美砷可湿性粉剂为对照。供试品种为２０～２３年生金冠和国光。共进行了以下３方面试验。（１）不同浓度试验：于４月１１日进行处理，２０天后调查结果，每处理调查４０块以上...
990A plant disease control apple tree rot disease test test agent for the “Sunland card” 990A plant disease-resistant agent to 40% Fu Mei Arsenic WP as a control. Test varieties for the 20 to 23-year-old gold crown and Guoguang. A total of the following three aspects of the test. (1) different concentrations of test: on April 11 for processing, 20 days after the survey results, each processing survey of 40 or more ...