Browsing by Author "Jefferson, R. N."

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    The killing effect of vegetable, animal, and mineral oils on the eggs of the codling moth and the oriental fruit moth
    Jefferson, R. N. (Virginia Tech, 1936-05-05)
    The ovicidal properties of various vegetable, animal, and mineral oils were tested in an effort to develop a supplementary method of control for the codling moth and the oriental fruit moth. The reasons for undertaking this problem are twofold: first, the codling moth has become exceedingly difficult to hold in check; and, second, in the case of the oriental fruit moth there is no satisfactory method of control. The studies could be carried on with both insects because they are very closely related and also, because the oriental fruit moth is a pest of apples as well as peaches.
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    A study of Sclerotium rolfsii, sacc.
    Jefferson, R. N. (Virginia Agricultural and Mechanical College and Polytechnic Institute, 1936)
    Sclerotium rolfaii Secc. is a fungus that is prevalent throughout the southern states, and at times causes very serious losses to farm crops and ornamental plants. It causes a disease known as Sclerotium Wilt, Southern Wilt, or Southern Blight. The Virginia Agricultural Experiment Station has received many complaints of Sclerotium Wilt on ornamental plants in the last few years, but has been unable to give any definite recommendations because no satisfactory method of control has been developed. the object of this investigation was to study the characteristics of the fungus and to discover, if possible, some method or methods of checking the disease when established.