Caution with Copper Fungicides and Spray Surfactants in ... | 農藥合法資訊網
2013年6月28日—Lowsolubility“fixed”copperfungicides,whensprayedonplantleaveswilldryandthenwillreleasecopperionsinsmallamountseverytimethe ...
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu[1]
There has been considerable use of copper fungicides this year, particularly because of the wet weather. Fixed coppers (low solubility) are an important component for bacterial disease control and also are effective on a number of fungal and oomycete diseases.
In the past, phytotoxicity to crops has been an issue with copper applications. Newer copper products have proven to be safer on vegetables and fruits. However, toxicity can still be a problem in some situations.
Copper fungicides work to kill pathogen cells by denaturing enzymes and other critical proteins. However, copper can also kill plant cells if absorbed in sufficient quantities. Low solubility “fixed” copper fungicides, when sprayed on plant leaves will dry and then will release copper ions in small amounts every time the leaf is wetted...
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