Abstract
The greenbug, Schizaphis graminum (Rondani), is a major pest of wheat in the Central and Southeastern States. Infestations are common in the High Plains of Texas where fertilizer practices vary from no fertilizer on dryland to high rates under irrigation. However, there is little specific work on the effects of plant nutrients on this aphid. Haseman (1946) indicated that the greenbug has a high nitrogen requirement and will not reproduce as well on small grains grown on N-deficient soil, but Arant and Jones (1951) showed populations to vary inversely with the amount of nitrogen applied to oats. Blickenstaff et al. (1954) also found that in oats and rye the greenbug population decreased as the rate of nitrogen was increased. Daniels and Porter (1956) found that high populations were associated with high nitrogen levels in the soil and with increased plant vigor. Daniels (1957) found that the number of greenbugs per gram of plant varied inversely with the amount of nitrogen applied. He found also that plant growth was improved when phosphorus was used in combination with nitrogen.
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