Greenbug Damage to Winter Wheat as Affected by Preceding Crop1

Publisher Website
Google Scholar
Abstract
Studies were conducted on the effects of soil taken from both wheat and alfalfa land on the populations of Toxoptera graminum and its damage to wheat. Soil was taken at 1-foot intervals to a depth of 4 feet. Pawnee wheat, grown in each soil interval, an equal parts mixture of all soil intervals and an equal parts mixture of the 1st and 4th-foot intervals, was infested with greenbugs. Increased greenbug populations were positively associated with high nitrogen levels in the soil and increased plant vigor. Wheat grown in alfalfa soil was more tolerant to greenbugs, inasmuch as it supported greater populations, than wheat grown in soil taken from wheat land. The 1st-foot intervals and the mixtures of both wheat and alfalfa soil supported more greenbugs than the 2d-, 3d- or 4th-foot intervals.

This publication has 3 references indexed in Scilit: