4. The preference of Jap beetles for liguleless-1 leaves. The severe infestation of Japanese beetles in the summer of 1942 at Irvington, N. Y. made possible the observation that these beetles found the leaf tissue of liguleless-1 (lg1) plants very much to their liking. Leaves of all lg tester strains were nearly destroyed and many plants died. In all cultures segregating for lg1 an accurate classification for lg and Lg could be made from the amount of leaf tissue eaten by the insects. Lg plants adjacent to sister lg plants were nearly free from beetles while the lg plants literally swarmed with them. Plants homozygous for lg2 had the same, or nearly so at any rate, degree of infestation as did their normal sibs.
M. M. Rhoades