Agriculture for beginners . its odor. Did you ever smell it as j-ou passed an affected field ?. Fjg. 131. Club Root Club Root. Club root is a disease of the cabbage, turnip,cauliflower, etc. Its general effect is shown in the illustra-tion (Fig. 131). Sometimes this disease does great damage.It can be prevented by using from eight}- to ninet} bushelsof lime to an acre. Black Knot. Black knot is a serious disease of the plumand of the cherr%- tree. It attacks the branches of the THE DISEASES OF PLANTS 141 tree; it is well illustrated in Fig. 132. Since it is a con-tagious disease, great care

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Agriculture for beginners . its odor. Did you ever smell it as j-ou passed an affected field ?. Fjg. 131. Club Root Club Root. Club root is a disease of the cabbage, turnip, cauliflower, etc. Its general effect is shown in the illustra-tion (Fig. 131). Sometimes this disease does great damage.It can be prevented by using from eight}- to ninet} bushelsof lime to an acre. Black Knot. Black knot is a serious disease of the plumand of the cherr%- tree. It attacks the branches of the THE DISEASES OF PLANTS 141 tree; it is well illustrated in Fig. 132. Since it is a con-tagious disease, great care should be exercised to destroyall diseased branches of either wild or cultivated plums orcherries. In many states its destruction is enforced by law.