CONTROL OF TYLENCHULUS-SEMIPENETRANS ON CITRUS WITH ALDICARB, OXAMYL, AND DBCP

  • 1 January 1979
    • journal article
    • research article
    • Vol. 11  (4) , 387-394
Abstract
Soil application of DBCP (1,2-dibromo-3-chloropropane) and foliar applications of oxamyl (methyl N'',N''-dimethyl-N-[(methylcarbamoyl)oxy]-1-thiooxamimidate) were compared for control of T. semipenetrans in a grapefruit (Citrus paradisi) orchard. DBCP reduced nematode populations and increased fruit growth rate, fruit size at harvest and yield compared to the untreated controls in the 2 yr following treatments. Foliar applications of oxamyl reduced nematode populations and increased fruit growth rate slightly the 1st yr, but not in the second. Foliar applications of oxamyl did not improve control attained by DBCP alone. Soil application of aldicarb [2-methyl-2-(methylthio)propionaldehyde-O-(methylcarbamoyl)oxime] or DBCP to an orange (C. sinensis) orchard reduced T. semipenetrans populations in the 3 yr tested and increased yield in 1 of 3 yr. Aldicarb treatment reduced fruit damage caused by the citrus rust mite, Phyllocoptruta oleivora. Aldicarb, applied at 5.7 or 11.4 kg/ha, by disk incorporation or chisel injection, was equally effective in controlling nematodes, improving yields, fruit size and external quality. In a grapefruit orchard, chisel-applied aldicarb reduced nematode populations and rust mite damage and increased yields in both years and increased fruit size in 1 yr. The 11.4 kg/ha rate was slightly more effective than the 5.7 kg/ha rate. Aldicarb appears to be an adequate substitute for DBCP for nematode control in Texas [USA] citrus orchards and well-suited to an overall pest management system for Texas citrus.