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石硫合剂防治作物病虫害,已有悠久的历史,直到现在还不失为一个较好的杀虫杀菌兼用剂。用波美3～5度石硫合剂防治落叶果树上的越冬病虫害,效果甚佳,是必须准备的良药。但是,近十多年来,笔者曾多次看到一些柑桔生产场圃,因长期使用而引起不同程度的药害,导致幼树产量迟迟不能上升,成树产量不稳,甚至大幅度下降。究其原因,是未能根据当时的天气条件、柑桔的生育状况来用药,仅仅单凭螨、蚧类发生情况确定喷布次数。笔者曾和有关专业人员讨论过该药剂的使用问题,现就此事谈点意见。
It has a long history of controlling crop pests and diseases and until now it has become a better insecticide and bactericide. With Baume 3 to 5 degrees stone sulfur mixture in the prevention and treatment of winter pests and diseases on deciduous fruit trees, the effect is very good, it is necessary to prepare good medicine. However, in the recent ten years or so, I have seen on many occasions some citrus production farms that cause different levels of phytotoxicity due to long-term use, leading to delays in the growth of saplings, instability in yield of mature trees, and even substantial decline. The reason is that according to the prevailing weather conditions, citrus fertility status to medication, just by mites, Kuwana class to determine the occurrence of spray number. I have discussed with the relevant professionals the use of the drug, we are talking about the matter.