Ethoprop depletion from soil as influenced by simulated rainfall
Rahi, G.S.; Rich, J.R.; Hodge, C.H.
Journal of Nematology 24(4s): 642-647
1992
ISSN/ISBN: 0022-300X PMID: 19283040 Document Number: 396936
Two field microplot tests were conducted in sandy soil to evaluate retention of ethoprop in relation to simulated rainfall levels. Ethoprophos was applied at the equivalent of 1.35 kg a.i./ha, and simulated rainfall was added at rates of 2.5, 7.5, 15.0 and 22.5 cm over a 6-day period. Ethoprophos concentration in the soil at 5-, 10-, and 40-day intervals indicated that it was depleted rapidly with increased rainfall levels. The 2.5-cm level of simulated rainfall reduced ethoprophos concentration to one-half in the 0 to 15 cm depth within 10.7 days, whereas the 22.5 cm of rain shortened this period to 1.7 days. Soil samples taken 10 days after ethoprophos treatment and inoculated with Meloidogyne javanica indicated that 2.5 cm of rain rendered the nematicide ineffective against M. javanica.