American Journal of Botany, Vol. 3, No. 7 (Jul., 1916), pp. 337-360 (26 pages) 1. The Phylloxera vastatrix leaf gall starts to develop on embryonic bud leaves. In twenty-four hours the insect produces ...

Grape phylloxera, scientifically known as Daktulosphaira vitifoliae, is a significant pest affecting grapevines worldwide. This tiny insect can damage both the roots and leaves of grapevines ...