title: Morphological comparison of meloidogyne males by scanning electron microscopy.
abstract: Field plots of Tifton loamy sand were treated with methyl bromide, DD-MENCS, or ethoprop for control of root-knot nematodes, Meloidogyne incognita, in a multiple cropping system of turnips, field corn, and southern peas. Annual applications of methyl bromide and DD-MENCS in November or December suppressed nematode numbers to very low levels through September, but numbers increased in the following October, November, and/or December. No benefit was found from ethoprop applied to DD-MENCS-treated plots before the planting of each crop. Nematode numbers were not significantly suppressed by ethoprop alone. Concentrations of ethoprop in the 0-15-cm soil layer were near 6 mug/g at application but were < 1mug/g of soil 5 days later on corn and southern peas and 30 days later on turnips. Ethoprop concentrations of 4.6 to 5.6 mug/g of soil are too low for adequate control of root-knot nematodes on field corn and southern peas in multiple cropping systems. Stepwise regression analyses indicated that 81% and 36% of the variations in concentration of ethoprop in the soil were attributable to the amount of water that the plots received when the maximum soil temperature ranged from 10 C to 19 C and from 31 C to 41 C, respectively, and that 11% was attributable to the maximum soil temperature within the temperature range of 17 C to 33 C.
authors.forename: W A
authors.initials: WA
authors.lastname: Rohde
authors.forename: A W
authors.initials: AW
authors.lastname: Johnson
authors.forename: C C
authors.initials: CC
authors.lastname: Dowlet
authors.forename: N C
authors.initials: NC
authors.lastname: Glaze