. Vegetable gardening. A manual on the growing of vegetables for home use and marketing . y crop, but the amountof the disease will generally be much more on the old land thanon the new. Perfectly clean seed potatoes planted on land which is freefrom the scab fungus will always and in any season produce acrop of smooth, clean potatoes, no matter what may be the char-acter of the soil; but apparently clean seed potatoes may hav(^the germs of the scab fungus on their surface. This is often thecase where they have been sorted out from a lot that is some-what infected with scab. In this latter cas
. Vegetable gardening. A manual on the growing of vegetables for home use and marketing . y crop, but the amountof the disease will generally be much more on the old land thanon the new. Perfectly clean seed potatoes planted on land which is freefrom the scab fungus will always and in any season produce acrop of smooth, clean potatoes, no matter what may be the char-acter of the soil; but apparently clean seed potatoes may hav(^the germs of the scab fungus on their surface. This is often thecase where they have been sorted out from a lot that is some-what infected with scab. In this latter case the tubers should,at least, be thoroughly washed in running water to remove anygerms that may be present or, what is better yet, be treated withcorrosive sublimate (mercuric bichloride) as recommended be-low. Land infected by the germs of potato scab will produce amore or less scabby crop, no matter how clean and smooth theseed used. Scabby potatoes should be dug as soon as mature, since the POTAfO. 20i scab fungus continues to grow on the potatoes as long as the^^ arein the I Treated. Figure 101—Potato Scab. Not Treated. Both plates grown from the same lot of scabby seed. Scabby potatoes may be safely used for seed provided theyare first treated in such a way as to destroy the germs of thescab that adhere to them. There are many methods of doingthis but the most practical now used are as follows: Corrosive Sublimate Treatment.—Procure from a druggisttwo ounces of powdered corrosive sublimate (mercuric bichlor-ide) ; put this into two gallons of hot water in a wooden orearthenware vessel and allow it to stand until dissolved. Placethirteen gallons of water in a clean barrel, pour in the solutionof corrosive sublimate and allow it to stand two or three hours,with frequent stirrings in order to have the solution potatoes as nearly free from scab as can be obtained;put the seed potatoes into bags, either before or after cuttingthem, and then dip them
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