Abstract
A population of the stem nematode, Ditylenchus dipsaci, found on in southern Cook County, Illinois, U.S.A., was the onion race based on the reaction of nine differential hosts. Twenty crop plants and 25 weed species distributed in nineteen families were tested in the greenhouse as possible hosts of the stem nematode of onion. The crop plants soybean, snap bean, and pea were rated as excellent hosts; tomato as a good host; and spinach, cabbage, celery, carrot, parsnip, potato, and parsley as fair hosts. Weed hosts included: Saponaria officinalis, Brassica nigra, Hibiscus trionum, Polygonum persicaria, P. pennsylvanicum, Rumex crispus, Solanum carolinense, S. nigrum, and Pastinaca sativa. Eight Allium species were screened for reaction to this population, and only leek (A. porrum) showed any degree of resistance. Eight new hosts of D. dipsaci and six new hosts of the onion race were found.
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