. Agriculture for beginners. Fig. 98. Yield from Two Fields of Same SizeThe one at top was sprayed; the one at bottom was unsprayed One pint of formalin, or enough for thirty gallons of water,will cost but seventy-five cents. Since this solution can beused repeatedly, it will do for many bushels of seed potatoes. Late Potato Blight. The blight is another serious dis-ease of the potato. This is quite a different disease fromthe scab and so requires different treatment. The blight 112 AGRICULTURE FOR BEGINNERS is caused by another fungus, which attacks the foliage ofthe potato plant. When the bl
. Agriculture for beginners. Fig. 98. Yield from Two Fields of Same SizeThe one at top was sprayed; the one at bottom was unsprayed One pint of formalin, or enough for thirty gallons of water,will cost but seventy-five cents. Since this solution can beused repeatedly, it will do for many bushels of seed potatoes. Late Potato Blight. The blight is another serious dis-ease of the potato. This is quite a different disease fromthe scab and so requires different treatment. The blight 112 AGRICULTURE FOR BEGINNERS is caused by another fungus, which attacks the foliage ofthe potato plant. When the blight seriously attacks acrop, it generally destroys the crop completely. In theyear 1845 a potato famine extending over all the UnitedStates and Europe was caused by this 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
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