Rosette copper

Zinc in Plant and Animal Nutrition. In 1854 A. Braun discovered the presence of zinc in plants and m 1869 J. Raulin proved diat it is essential for the growth of Aspergillus (153, 154). Its important role in die nutrition of many plants and animals has been demonstrated repeatedly (104, 105). When some pecan tines growing on a copper-deficient soil were treated widi a copper solution, die only trees which responded favorably were those treated with a solution which had been stirred up in a galvanized bucket and therefore contained zinc unintentionally (106). Zinc solutions are now used in the treatment of pecan rosette and other zinc-deficiency diseases of fruit trees and nut-bearing trees in the western states (112). 

Lastly, When the block copper is very rich, the process is commenced by subjecting it to a first liquation with workable lead, the products of which are a rich lead for cupelling, and a middling rich black copper the latter is then submitted to a second liquation with poor lead, which yields cupreous residues very poor in silver, to be treated for rosette copper, and moderately... 

The torrefied oorcas are refined for rosette copper they still contain ten per cent, of lead, end yield seventy to seventy-five per cent, of rosetta copper. 

Nitro-2-aminophenylarsinic acid is diazotised and treated in alkaline solution with sodium arsenite in the presence t)f copper ])owdcr. The diarsinie acid thus obtained is purified by means of its zinc salt, a pale yellow, crystalline powder. The acid crystallises in large, prismatic rosettes of needles, containing 1 molectilc of water. It is sparingly soluble in cold water, readily soluble in hot water, moderately soluble in alcohols, fairly soluble in acetone aird acetic acid, insoluble in benzene and chloroform. When heated above 100° C. it pas.ses into the anhydride. 

Flowers with reddish, twisted petals no fruit set. Cause Double blossom. Double blossom, known as rosette, also causes plants to throw out witch s brooms, dense masses of deformed twigs with pale leaves. To control this fungal disease, remove infected canes as soon as you notice them. To help prevent the spread of the fungus, spray the whole planting with copper 2 or 3 times at 10-day intervals. If the disease is rampant, mow down the whole planting and destroy the newly cut canes. Avoid planting sites near wild brambles, which may carry the disease. Resistant cultivars include Hordagrand and Humble . 

Peach aphids, green, 269,419 Peach leaf curl, 344,383 bordeaux mix for, 467 copper for, 471 peach and, 165,167,383 Peach rosette, 168,394,394 Peach scab,165,166 Peachtree borers, 313.313 apricot and, 27 cherry and, 69 peach and, 165, 168 pheromone traps for, 437 Peach twig borers almond and, 17 apricot and, 26 peach and, 165, 166-67 Pear, 168-71... 

According to the investigations of Fattinger (1950), the fungicidal action of copper is enhanced by cadmium, cobalt, nickel and zinc compounds in Alternaria tenuis and Trichothecium roseum cultures. Zinc sulfate (ZnSO 7HjO) was tried in place of copper sulfate its effect however was inferior to that of the copper compound. Nevertheless, it is still used against rosette disease a physiological disease caused by zinc deficiency. 

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