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Factors Influencing Catenaria Anguillulae Infections in a Free-Living and a Plant-Parasitic Nematode

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image of Nematologica
For more content, see Nematology.

A phycomycetous fungus, Catenaria anguillulae, a parasite of phytonematodes, was isolated from greenhouse soil and cultured. Zoospores of the fungus were tested for virulence to the nematodes, Panagrellus redivivus and Ditylenchus dipsaci. A linear relationship was shown to exist between increasing numbers of zoospores and the incidence of the fungus disease in nematodes in vitro. The fungus developed more rapidly at 28° C than at the lower temperatures. D. dipsaci was less susceptible to attack from the fungus than P. redivivus. A pH of 9 and a low salt concentration favored the rapid development of the fungus in nematodes. Many more zoospores were required in sand and soil to achieve the same incidence of the disease than in liquid cultures. The tests indicated that this fungus isolate was not a very effective biological control agent.

Affiliations: 1: Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, U.S.A.


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