Interactions Between Calonectria crotalariae and Heterodera glycines on Soybean
Overstreet, C.; McGawley, E.C.; Russin, J.S.
Journal of Nematology 22(4): 496-505
1990
ISSN/ISBN: 0022-300X PMID: 19287749 Document Number: 354495
The interactions of H. glycines at 4 egg inoculum levels (0, 100, 1000, and 10 000/pot) and 3 cyst levels (0, 100, and 200/pot) and C. crotalariae at 500, 5000, and 50 000 microsclerotia per pot were evaluated on soyabean. At the 2 lowest nematode egg levels, the presence of C. crotalariae did not affect nematode reproduction. At 10 000 eggs/pot, however, nematode reproduction was increased significantly at each microsclerotial level. The increase in nematode reproduction was stepwise at 500 and 5000 microsclerotia/pot but declined at 50 000 microsclerotia/pot. Similar results were obtained when cysts rather than eggs were used as nematode inoculum. The nematode X fungus interaction significantly affected 60-day plant growth parameters of both Lee 74 and Centennial soyabean. The nematode X fungus interaction was antagonistic to plant roots and significantly influenced root injury ratings. The presence of C. crotalariae in tissues of stock plants or plants used as race differentials did not alter the analysis of this population as race 3.