• 1 January 1976
    • journal article
    • research article
    • Vol. 8  (2) , 122-130
Abstract
Foliar sprays of 4 .mu.g/ml oxamyl on sweet orange trees in a greenhouse slightly depressed the number of T. semipenetrans larvae obtained from roots and soil, but similar treatments were not effective in 2 orchards. Soil drench treatments decreased the number of citrus nematode larvae obtained from roots or soil of citrus plants grown in a greenhouse and in orchards. Exposure to 5-10 .mu.g/ml of oxamyl in water was lethal to only a few 2nd-stage-larvae 2nd-stage larvae treated 10 days, and many 2nd-stage larvae in 20 .mu.g/ml oxamyl recovered motility when transferred to fresh water. Aqueous solutions of 50 and 100 .mu.g/ml of oxamyl were toxic to citrus nematode larvae. Additional observations indicate that oxamyl interfered with hatch of citrus nematode larvae and was nematistatic and/or protected sweet orange roots from infection. Oxamyl degraded at different rates in 2 soils. The number of citrus nematode larvae that infected and developed on sweet orange roots was increased by an undetermined product of the degradation of oxamyl in soil, water and possibly within plants. This product apparently was translocated in roots.

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