Agriculture . hey can be seen only by a magnifying glass or a microscope—hence these plants are sometimes called microscopic plants. Prevention of Disease.—If we could destroy these sporeswe would, of course, prevent the growth of the disease addition, therefore, to destroying all plants and parts ofplants known to be diseased, we should use preventives when-ever we think the disease is likely to be started. The leavesand stalks of house plants are washed from time to time inorder to clean them from dust and also to wipe off diseasespores. One of the principal substances used for kil
Agriculture . hey can be seen only by a magnifying glass or a microscope—hence these plants are sometimes called microscopic plants. Prevention of Disease.—If we could destroy these sporeswe would, of course, prevent the growth of the disease addition, therefore, to destroying all plants and parts ofplants known to be diseased, we should use preventives when-ever we think the disease is likely to be started. The leavesand stalks of house plants are washed from time to time inorder to clean them from dust and also to wipe off diseasespores. One of the principal substances used for killing these THE DISEASES OF PLANTS. 91 spores in the case of trees and shrubs is bluestone (also knownas sulphate of copper). When the fruit grower sprays his treesto check disease on the branches or leaves or fruit he uses asolution of bluestone. Sometimes he makes a mixture of Parisgreen and bluestone, the Paris green being to kill all insectsthat eat the leaves, and the bluestone to destroy the spores or.
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Keywords: ., bookcentury1800, bookdecade1890, bookidag, booksubjectagriculture
