Meloidogyne microtyla: Pathogenicity to Orchard Cover Grasses, Survival in Stored Soil, and Reproductivity After Storage. J. L. Townshend, Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0. J. W. Potter, Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0. Plant Dis. 70: 438-440. Accepted for publication 14 October 1985. Copyright 1986 Department of Agriculture, Government of Canada. DOI: 10.1094/PD-70-438.

Meloidogyne microtyla was most destructive on creeping red fescue, reducing accumulated top clippings 42% over 18 wk. Kentucky bluegrass was not affected by this root-knot nematode. The greatest number of juveniles developed on the roots of perennial ryegrass, and the lowest number, on creeping red fescue. Numbers of juveniles recovered from soil stored at 5 C increased in a cyclical manner over a 1-yr period, whereas those from soil stored at 22 C diminished to almost undetectable numbers within 98 days. The occurrence of diapause in M. microtyla is proposed. Reproductivity of M. microtyla on tomato in soil previously stored at 5 C was nine times that of M. microtyla in soil from fresh tomato + grass cultures and 100 times that of M. microtyla in soil stored at 22 C.