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Common name copper oxychloride (E-ISO, accepted in lieu of common name); oxychlorure de cuivre (F-ISO)
IUPAC name dicopper chloride trihydroxide (approximate composition); copper oxychloride
Chemical Abstracts name copper chloride oxide hydrate
CAS RN [1332-40-7]; ([1332-65-6], defined as copper chloride hydroxide)
PHYSICAL CHEMISTRY
Composition Contains 57% Cu++. Mol. wt. 427.1 M.f. Cl2Cu4H6O6 Form Green to bluish-green powder. M.p. decomp. 300 °C V.p. Negligible at 20 ºC Solubility In water <10-5 mg/l (pH 7, 20 ºC). Insoluble in organic solvents. Soluble in dilute acids, forming Cu(II) salts; soluble in ammonium hydroxide, forming a complex ion. Stability Very stable in neutral media. Decomposes on heating in alkaline media with the formation of copper oxides. Decomposes on heating, with the formation of copper oxides, and loss of hydrogen chloride.
APPLICATIONS
Biochemistry Copper-II ion (Cu++) is taken up by the spores during germination and accumulates until a sufficiently high concentration is achieved to kill the spore cell; the activity is limited to the prevention of spore germination.
Mode of action Foliar fungicide with protective action. Deposits must be on the crop before fungal spores begin to germinate.
Uses Control of late blight of potatoes, tomatoes and other vegetables; leaf spot diseases of beet, celery, celeriac, parsley, olives, currants, and gooseberries; downy mildews of vines, hops, spinach, and ornamentals; canker and scab of pome fruit and stone fruit; scab, canker, and melanose of citrus fruit; asparagus rust; peach leaf curl; shot-hole of stone fruit; cane diseases of raspberries and blackberries; leaf spot and leaf scorch of strawberries; anthracnose and blister blight of tea; leaf spot and downy mildew of cucumbers and melons; bacterial diseases of lettuce; etc.
Phytotoxicity Non-phytotoxic at the recommended rates, except to carrots and potatoes under certain conditions. Russetting may occur with some varieties of apple.