Successful farming : a ready reference on all phases of agriculture for farmers of the United States and Canada . Apple Tree with Typical Collar .Showing proper method of cutting back into healthybark before treating with paint. 942 SUCCESSFUL FARMING trees and more or less injurious to apple trees, dependent somewhat on thevarieties. They also occur on pears, quinces, cherries, plums, grapes,roses and many other plants. The diseased tissues extend throughout a considerable partof the plant whichmakes cutting offof these malforma-tions a very uncer-tain treatment. The hairy rootappear
Successful farming : a ready reference on all phases of agriculture for farmers of the United States and Canada . Apple Tree with Typical Collar .Showing proper method of cutting back into healthybark before treating with paint. 942 SUCCESSFUL FARMING trees and more or less injurious to apple trees, dependent somewhat on thevarieties. They also occur on pears, quinces, cherries, plums, grapes,roses and many other plants. The diseased tissues extend throughout a considerable partof the plant whichmakes cutting offof these malforma-tions a very uncer-tain treatment. The hairy rootappears under-ground as a massof fibrous roots andabove ground aswarty knots ontrunk and branch,and is sometimesmistaken for cank-ers, due to othercauses. —The organism whichcauses this diseaselives in the soil forseveral years, andcannot be eradi-cated except by along rotation ofcrops. It is unwiseto set orchards,especially peachorchards, in oldberry fields or otherfields known to beinfected or to useberries as inter-rowNursery stock known to be infected should be de-. Yotjng Apple Tree from the disease known as Root Gall. crops in orchards,stroyed. PEAR Blight (Bacillus amylovorus [Burr], De Toni).—This very familiardisease causes the leaves and young twigs to die and blacken very much asthough injured by fire. These dead leaves hang on the trees during thewinter instead of falling in the autumn, as is the case with healthy disease also attacks the branches, causing black, sunken cankers from 1 Courtesy of The Field, New York. DISEASES OF CROPS 943 which a sticky, milky fluid oozes in the early spring, and from which thedisease is spread, by means of insects, to the opening blossoms. If theweather conditions are favorable the blossoms and fruit spurs die andblacken and very frequently considerable quantities of the young fruit aredestined. The disease also occurs on the apple, crab, hawthorn andother related trees. Treatment.—Prune and b
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
