EFFECTS OF SOIL-MOISTURE ON CONTROL OF HETERODERA-SCHACHTII WITH ALDICARB

  • 1 January 1977
    • journal article
    • research article
    • Vol. 9  (3) , 211-215
Abstract
Soil moisture and the nematode population density in aldicarb-treated soil influenced control of the sugar beet nematode, H. schachtii. Greater numbers of nematode larvae infected 14-day old sugar beet seedlings growing in aldicarb-treated soil at 20-30% than at 80-100% field capacity (F.C.), and plant growth was inversely related to nematode infection and the nematode population density. Compared with that of control plants, plant growth increase also was greater at 80-100% F.C. when the nematode population was above 1.8 larvae/g soil. A nematode population of 1.8 larvae/g soil did not significantly affect sugar beet yields. Aldicarb gave less control when soil moisture levels dropped to 20 and 50% F.C. at nematode populations of 3.5 and 6.2 larvae/g soil. More effective control was obtained with soil moisture levels at or above 80% F.C. This difference was attributed to continued activity of the toxicant in the rhizosphere at the high moisture level.

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