. Fig. 121.—^ Potato common-scab. After Melhus. Estimates show that from 5 to 75 per cent of the potato crop is unsalable on account of scab. The loss in California in one county alone is placed at $300,000 yearly. Common-scab is most prevalent in alkaline soils and is favored by moisture. Wood ashes, potash, soda, stable manure, lime, etc., increasing alkalinity, favor the growth of the fungus, and cause increase in the amount of scab in soil already infested. Materials which tend to decrease scab are commercial fertilizers, potash salts (except carbonate), land plaster, and ammonium sulfate.
. Fig. 121.—^ Potato common-scab. After Melhus. Estimates show that from 5 to 75 per cent of the potato crop is unsalable on account of scab. The loss in California in one county alone is placed at $300,000 yearly. Common-scab is most prevalent in alkaline soils and is favored by moisture. Wood ashes, potash, soda, stable manure, lime, etc., increasing alkalinity, favor the growth of the fungus, and cause increase in the amount of scab in soil already infested. Materials which tend to decrease scab are commercial fertilizers, potash salts (except carbonate), land plaster, and ammonium sulfate. Rotation of crops tends
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921
