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Disease Control and Pest Management

Dosage-Response of Root-Knot Nematode-Infected Grape Roots to cis-1,3-Dichloropropene. M. V. McKenry, Assistant Research Nematologist, San Joaquin Valley Agricultural Research and Extension Center, Parlier, CA 93648; I. J. Thomason(2), and P. Naylor(3). (2)(3)Professor of Nematology, Department of Nematology, University of California, Riverside, CA 92502; (3)Staff Research Associate, San Joaquin Valley Agricultural Research and Extension Center, Parlier, CA 93648. Phytopathology 67:709-711. Accepted for publication 3 December 1976. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-709.

Field and laboratory populations of Meloidogyne spp. within roots of Vitis vinifera ‘Thompson Seedless’ were exposed at 20-23 C to various dosages (concentration-time) of gaseous cis-1,3-dichloropropene. Roots then were bioassayed on tomato plants. The resulting LD50 value for nematodes within roots 3.2 to 13 mm in diameter was calculated to be 85 μg ml–1 day in the soil water. The LD95 value was approximately 170 μg ml–1 day. Dosages of less than 60 μg ml–1 day resulted in greater infectivity than in the nontreated control roots. The LD99.9 value was extrapolated to be approximately 180 μg ml–1 day, or a dosage of eight times that required to kill soil populations of infective juveniles at the same soil temperature.

Additional keywords: soil fumigation, nematicide, perennials.