Bordeaux mixture is the broadest-spectrum protective fungicide with the longest application time, the widest application range, the most stable drug effect, and no drug resistance. Its active ingredient is basic copper sulfate. In the production practice, some fruit farmers often cause phytotoxicity due to improper preparation or use, and should pay attention and prevent.
First, the cause of the phytotoxicity of Bordeaux mixture
1. When preparing Bordeaux mixture, the copper sulfate is not completely dissolved. When the medicine is sprayed on the fruit together with the dregs, the fruit will appear reddish brown stains and reduce the commercial value of the fruit.
2. The use of Bordeaux mixture in the young fruit stage and fruit ripening of apples will cause rust spots on the fruit surface, rough skin and reduced smoothness, resulting in a decrease in the appearance quality of the fruit.
3, peach, apricot, plum tree growing season is sensitive to copper, the use of Bordeaux liquid is prone to copper ion poisoning, leading to defoliation, fruit drop. When the amount of lime in the Bordeaux mixture is lower than the multiple amount, the apple, especially the golden crown variety, the hawthorn, the persimmon tree, etc. are susceptible to phytotoxicity. When the amount of lime is higher than the equivalent amount, grape longan, non-nuclear purple, enamel and other varieties are prone to phytotoxicity.
4, Bordeaux mixture with stone sulphur mixture, antibacterial special, etc., or alternate use, the interval is too short, are easy to produce phytotoxicity.
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