Farm crops, their cultivation and management, a non-technical manual for the cultivation, management and improvement of farm crops . the above andmany related starts at the edgesof the leaves, causinga blackening of theveins, gradually work-ing downward to themain stalk and thenupward and outwarduntil the entire plant isaffected. The affectedleaves become yellow,wilt and then dry. Inadvanced stages thedisease is accompaniedby other rot organismswhich cause a pro-nounced odor. Treatment.—Whenonce in the soil it isextremely difficult toeradicate. Prevent in-fection by using cleanseed,
Farm crops, their cultivation and management, a non-technical manual for the cultivation, management and improvement of farm crops . the above andmany related starts at the edgesof the leaves, causinga blackening of theveins, gradually work-ing downward to themain stalk and thenupward and outwarduntil the entire plant isaffected. The affectedleaves become yellow,wilt and then dry. Inadvanced stages thedisease is accompaniedby other rot organismswhich cause a pro-nounced odor. Treatment.—Whenonce in the soil it isextremely difficult toeradicate. Prevent in-fection by using cleanseed, which as a pre-cautionary measureshould be soaked forfifteen minutes in for-maldehyde (1 part for-malin to 30 partswater). Club Root or Fin-ger and Toe Disease{Plasmodiophora hrassica?, Wor.).—This very destructive and well-kno-sTOdisease attacks cabliage and related plants, causing unsightly knottedroots. The diseased plants are dwarfed and fail to develop heads. Treatment.—Use nothing but absolutely clean soil in the seed-beds;use lime in the fields; rotate crops. From Farmers Bulletin 488, U. S. Dept. of Enlarged Roots of Cabbage Caused by Nematodes. DISEASES OF CROPS 243 CARROTSoft Rot (Bacillus carotovorus, Jones).—This is a bacterial diseasewhich causes a soft rotting of the roots. It also attacks turnips, radishes,parsnips, onions, celery, beets and many other plants. The only satis-factory treatment lies in the rotation of crops. POTATO Late Blight or Downy Mildew (Phytopthora infestans [Mont.], DeBy.).—This disease usually starts near the tip or margin of the leaf, butcauses the infected area to die and blacken. In cool, wet, cloudy weatherit spreads very rapidly and causes an offensive odor. The diseased tubersmay show slightly depressed, dark-colored areas and a dirty brown colorwithin. The disease is frequently the cause of heavy losses by rotting. Treatment.—Spray with Bordeaux mixture, beginning when the plantsare about six inches in heig
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Keywords: ., bookcentury1900, bookdecade1910, bookidfa, booksubjectagriculture
