GRANULAR NEMATICIDES AS ADJUNCTS TO FUMIGANTS FOR CONTROL OF COTTON ROOT-KNOT NEMATODES

  • 1 January 1979
    • journal article
    • research article
    • Vol. 11  (2) , 144-150
Abstract
Growth and yield of cotton [Gossypium hirsutum] were best with combinations of fumigants and organophosphate and carbamate nematocides. Organophosphates or carbamates used alone did not give season-long control of root-knot nematodes [Meloidogyne incognita]. Long-term control was poor because the temporary sublethal effects of these materials diminished soon enough that the nematodes could reproduce. The nematodes survived the treatments and a year of nonhost culture, and damaged a susceptible host crop 2 yr after treatment. No such damage occurred in plots treated with fumigant, fumigant plus organophosphate, or fumigant plus carbamate. Treatment of seed and treatment of cotton, either in furrow at planting or sidedressing at midseason, with organophosphate and carbamate nematocides resulted in little or no yield increase, because nematode control was only minimal and temporary; or in a yield decrease, because the toxicity of the materials was manifested when nematode populations were low.