. Agriculture for beginners. Fig. 99. Spraying Machine Spraying is the remedy for this disease. Fig. 98shows the effect of spraying upon the yield. In this casethe sprayed field yielded three hundred and twenty-fourbushels an acre, while the unsprayed yielded only onehundred bushels to each acre. Fig. 97 shows the resultof three applications of the spraying mixture upon the THE DISEASES OF PLANTS 113 diseased done. Figs. 99 and 100 show how the spraying EXERCISE Watch the potatoes at the next harvest and estimate the numberthat is damaged by scab. You will remember that formalin is th
. Agriculture for beginners. Fig. 99. Spraying Machine Spraying is the remedy for this disease. Fig. 98shows the effect of spraying upon the yield. In this casethe sprayed field yielded three hundred and twenty-fourbushels an acre, while the unsprayed yielded only onehundred bushels to each acre. Fig. 97 shows the resultof three applications of the spraying mixture upon the THE DISEASES OF PLANTS 113 diseased done. Figs. 99 and 100 show how the spraying EXERCISE Watch the potatoes at the next harvest and estimate the numberthat is damaged by scab. You will remember that formalin is thesubstance used to prevent grain smuts. Write to your State Experi-ment Station for a bulletin telling how to use formalin, as v/eW as for. Fig. 100. Spraying Machine information regarding other potato diseases. Give the treatment afair trial in a portion of your field this year, and watch carefully forresults. Make an estimate of the cost of treatment and of the does the scab injure the value of the potato ? The late blightcan often be recognized by its odor. Did you ever smell it as youpassed an affected field ? 114 AGRICULTURE FOR BEGINNERS The Club Root. The club root is a disease of the cab-bage, turnip, cauliflower, etc. Its general effect is shownin the illustration (Fig. loi). Sometimes this disease doesgreat damage. It can be prevented by the use of lime atthe rate of from eighty to ninety bushels per acre. The Black Knot. The black knot is a serious disease ofthe plum and cherry tree. It attacks the branches of thetree and is well illustrated in Fig. 102. Since it is a con-tagious disease, great care should be exercised to destroyall diseased branches of the wild or cultivated plums or
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