. Horticulture; a text book for high schools and normals, including plant propagation; plant breeding; gardening; orcharding; small fruit growing; forestry; beautifying home grounds; the soils and enemies involved. become hard and dry; the riperfruits shrivel and turn brownish in color. (Minnesota Station.) frequently killed. Resistant varieties must be used for stocks inorder to control the root form of this pest. If European grapes, aregrafted upon American stocks, they are usually not seriouslyaffected by this enemy. The grapevine root-borer feeds on the roots of the grape somedistance unde
. Horticulture; a text book for high schools and normals, including plant propagation; plant breeding; gardening; orcharding; small fruit growing; forestry; beautifying home grounds; the soils and enemies involved. become hard and dry; the riperfruits shrivel and turn brownish in color. (Minnesota Station.) frequently killed. Resistant varieties must be used for stocks inorder to control the root form of this pest. If European grapes, aregrafted upon American stocks, they are usually not seriouslyaffected by this enemy. The grapevine root-borer feeds on the roots of the grape somedistance under the ground. Its work is not usually noticed until 250 GRAPES the vine dies or is nearly killed. It is believed that the muscadinegroup of grapes is not affected by this pest. It has been suggestedthat these vines be used as stocks for the grafting of other grapeswhere this enemy is serious. Diseases of the Grape.—The black rot is doubtless the worstdisease of the grape. Downy mildew (Fig. 177) is also very destruc-tive in some sections. The methods required in preventing blackrot disease will effectively control several other diseases which mayotherwise occur. Spraying with Bordeaux mixture in the early. Fig. 178.—Grapes affected with rot disease. Courtesy Mel. J. Cook. stages of fruit formation is recommended. This spray may becombined with arsenical poisons so as to control the disease andthe leaf-eating insects at the same time. The first spraying shouldtake place about the time the blossoming is over. It should berepeated every ten days or two weeks according to the weatherconditions. With frequent rains and rapid growth, the sprayingmust be more frequent. Figure 178 shows the first effects of rot disease. If the attacks ofrot and mildew occur before Bordeaux mixture has been applied itmay be impossible to control the diseases. However, unaffectedparts of the vine may be saved if the work is done promptly. After QUESTIONS 251 the grapes are nearly full size, spraying
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Keywords: ., bookcentury1900, booksubjectfruitculture, booksubjectgardening
