Residues of Aldicarb and its Oxides in Beta vulgaris L. and Systemic Control of Heterodera schachtii

Arnold E. Steele

Abstract


Altlicarb residues in foliage of Beta vulgaris L. 21 days after transplanting to soil treated with 1-5 [mu]g aldicarb/g soil were proportional to residues in storage roots, but 20 times as great. Initial concentrations of residues in roots 21 days after treatment were proportional to applied rates but declined by 56% when roots were stored 25 days at 24 C. Mean respective concentrations of aldicarb, aldicarb sulfoxide, and aldicarb sulfone were 8.7, 81.6, and 9.8% of the total residues. In separate tests, equivalent concentrations of toxic carbamates in roots resulted in similar levels of control of Heterodera schachtii. Systemic levels that completely suppressed development of females and males on sectioned roots were respectively 0.35 and 0.8 [mu]g/g of root tissue. Key Words: aldicarb sulfoxide, aldicarb sulfone, chemical assay, bioassay, sugarbeet nematode, beets.

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