The juvenile nematodes then ingest the parent nematode. "Cucullanus elegans" is a species of parasitic nematode. Rice pests include weeds, pathogens, insects, nematode, rodents, and birds. The Urticaceae are subject to many bacterial, viral, fungal, and nematode parasitic diseases. Growers should avoid planting susceptible bulbs, seeds, or seedling during seasons of peak nematode infection. James Paget discovered the intestinal nematode "Trichinella spiralis" in humans in 1835. One spectacular parasite is "Philometra saltatrix", a philometrid nematode in the ovaries. Maras are also hosts for parasites such as the nematode worm "Wellcomia dolichotis". Some of these include dipteran flies, "Pyemotes" mites, and a large number of nematode parasites. Another remedy that has been successfully applied is use of the parasitic nematode "Steinernema scapterisci". The onion eelworm ("Ditylenchus dipsaci"), a tiny parasitic soil-living nematode, causes swollen, distorted foliage. The "Strongyloides stercoralis" nematode can parasitize humans. Scots pines may be killed by the pine wood nematode, which causes pine wilt disease. In rotations with sugar beets, suppression of the white beet-cyst nematode is an important trait. As an example of water-borne Nematode infections, one important waterborne nematodal disease is Dracunculiasis.