Reproduction of Mixed Populations of Tylenchorhynchus clarus and Pratylenchus spp. on 10 Host Plants. Ezarug Ahmed Edongali, Graduate Student, Division of Nematology, University of California, Davis 95616. Benjamin F. Lownsbery, Professor, Division of Nematology, University of California, Davis 95616. Plant Dis. 64:458-459. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-458.

Tylenchorhynchus clarus increased more than 10-fold in 3 mo on wild ryegrass, sweet corn, and parsley and more than eightfold on tomato cv. V.F. 145 and Yellow Dock in unsterilized soil. Multiplication was greatest on alfalfa cv. Lahonton, at 20 C; this 15-fold multiplication was twice that at 25 or 30 C and was not accompanied by injury to alfalfa roots. T. clarus reproduced rapidly on alfalfa seedlings growing on agar medium under high light intensity but reproduced slowly under low light intensity, probably because seedling growth was reduced. Pratylenchus spp. (97% P. thornei) in the soil increased 57-, 35-, 34-, 25-, and 22-fold on wild ryegrass, tomato cv. Cherry, barley cv. Briggs, tomato cv. V.F. 145, and parsley, respectively.

Keyword(s): host range, laboratory culture, Pratylenchus thornei, temperature effects.