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Show one of the recommended control measures. The annual loss of produce to rats on American farms is enormous. enor-mous. It is estimated that the labor of 265,000 farmers would be required to replace the amount destroyed each year. Apart from this damage, rats kill chicks and spread disease. A material especially suited for rat-proofing of farm structures is asbestos ..cement board. Composed Com-posed of two inorganic substances, asbestos fibers and Portland cement, ce-ment, it is manufactured in large, rigid sheets. The smooth-surfaced board offers no inducement to rats and they won't gnaw through it. Farmers Warned On Rat Proofing With feed so expensive, farmers should re-double their efforts , to reduce its waste and destrustion by rats, agricultural engineers declare. They emphasize that rat-proofing rat-proofing of farm buildings, particularly part-icularly grain and feed bins, is |