. California country journal. Agriculture -- California. 28 PACIFIC TREE AND VINE Potato Scab and its Prevention A bulletin from the Vermont Experiment Station treats of potato scab, and after a brief history of it, declares that it is dne to a fungus disease which also is the same as sometimes found on beets, and that any insects found in the scab are secondary results, rather than a cause. The l\ni^us is probably not a naiive of our soils Its germs oc- cur in great numbers on scabby potatoes, and may cling to the sur- face of smooth tubers. Much of the loss from scab is directly due to the u
. California country journal. Agriculture -- California. 28 PACIFIC TREE AND VINE Potato Scab and its Prevention A bulletin from the Vermont Experiment Station treats of potato scab, and after a brief history of it, declares that it is dne to a fungus disease which also is the same as sometimes found on beets, and that any insects found in the scab are secondary results, rather than a cause. The l\ni^us is probably not a naiive of our soils Its germs oc- cur in great numbers on scabby potatoes, and may cling to the sur- face of smooth tubers. Much of the loss from scab is directly due to the use of infected seed. When the fungus is not present in the soil a crop is assured if clean seed is used. Certain soils are entirely free from it when it is not introduced by the use of seed that has the germ. The putting of scabby potatoes in the soil or in the manure may spread the disease, but one trial of feeding scabby potatoes to young cattle and then using the manure did not result in scab on the pota- toes grown on it. It is not known how long the in fecting fungus may remain in the soil. Disinfected seed uj^on land where neither potatoes nor beels had been grown for seven years or longer produced fifty per cent, scabby potatoes'on some paitsof the field. Heavy soils, whether of clay, muck or vegetable matter, have been found favorable to growth of scab, perhaps because more moist than other soils, and the use of stable manure, soda ash, carbonate potash and magnesia seem to cause more scab, while common salt, land plaster, commercial fertilizers, s\il- phate of ammonia, nitrate of soda, kainit, mnirate or sul]>hate of pot- ash do not increase it and some- times seem to check it. An acid soil, such as results from plowing under a green crop, seems to check the scab, while lime or wood ashes may increase it. Some varieties of potatoes with rough skins are less subject to it than the smooth skins. Of seven varieties tested the Early R'lse had most scabby potatoes, and o
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