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Persistence and Microbiological Effects of Acarol® and Chlorobenzilate in Two Florida Soils¹

ABSTRACT

The influence of the miticides Acarol® (benzilic acid, 4,4'-dibromo-isopropyl ester) and chlorobenzilate (benzilic acid, 4,4'-dichloro-ethyl ester) on nitrification capacity and relative microbial numbers in Lakeland and Leon fine sands was determined. Since chlorobenzilate is now used commercially and a proposal is pending for the registration and sale of Acarol®, it is important to assess the effects of these materials on soil microbial populations.

The miticides were applied to Lakeland and Leon fine sands at rates of 0, 0.25, 0.50, and 1.0 ppm, incubated in the laboratory for 16 weeks, and sampled for analysis at periodic intervals.

Neither chemical influenced the nitrification capacity of either soil or the numbers of fungi, bacteria, and actinomycetes. Acarol® was more persistent than chlorobenzilate; both chemicals remained at higher levels for longer periods of time in Leon soil than in Lakeland soil. The miticides had finite rates of disappearance from both soils.

Key Words: miticides • nitrification

¹ Contribution from the Departments of Soil Science and Food Science, Univ. of Florida, Gainesville, 32601. Journal Series no. 4393.

² Associate Professor of Food Science, Professor of Soil Science and Assistant Professor of Soil Science, respectively. Univ. of Florida, Gainesville. 32601.

Received for publication March 25, 1972.