. Fungous diseases of plants, with chapters on physiology, culture methods and technique . e area. This areamay constitute a more or lessirregular scab-like crust overthe surface, or more fre-quently may become deeplycracked and furrowed, thedepth and extent of the injurydepending in a great meas-ure upon the stage at whichthe tuber first became dis-eased ; those which are at-tacked while very youngshowing, as might be ex-pected, by far the most deepseated injury (Fig. 127). If scabby potatoes arecarefully harvested and im-mediately examined, therewill be found associated withthe disease an ev
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . e area. This areamay constitute a more or lessirregular scab-like crust overthe surface, or more fre-quently may become deeplycracked and furrowed, thedepth and extent of the injurydepending in a great meas-ure upon the stage at whichthe tuber first became dis-eased ; those which are at-tacked while very youngshowing, as might be ex-pected, by far the most deepseated injury (Fig. 127). If scabby potatoes arecarefully harvested and im-mediately examined, therewill be found associated withthe disease an evanescentgrayish film. This film is made up of extremely delicate, minute,refractive, branched filaments, which break up into bacterioidalcells. Some branches are curved, and spore-like structures arealso produced within certain cells. Experiments demonstrate that the fungus may persist in the soilseveral years. A few scabby potatoes are sufficient to spread theorganism to a bin of clean tubers. To secure potatoes free of scab,clean tubers should be planted in soil free from the Fig. 12^ A Sugar Beet affected withScab FUNGI IMPERFECTI 293 Control. Abundant experimental work has shown that of thetwo possible lines of control, soil treatment or seed treatment, thelatter is most effective ; and this, together with a judicious rota-tion of crops, is sufficient permanently to control this method of treating the seed tubers consists in immersingthem for two or more hours in a solution of i ounce of formalinto every 2 gallons of water, or in a solution of bichloride of mer-cury, consisting of i ounce to 8 gallons of water. V. BUD ROT OF CARNATIONSSporotrichum Poce Pk. Heald, F. D. The Bud Rot of Carnations. Neb. Agl. Exp. Sta. Built. 103 : pis. i-S. , F. C, and Hodgkiss, H. E. The Bud Rot of Carnations and the Silver Top of June Grass. N. Y. (Geneva) Agl. Exp. Sta., Tech. Built. 7: 83-119. pis. 1-6. 1908. Habitat relations. The bud rot of carnations has
Size: 1236px × 2021px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherbostonnewyorketcgi
