Control of Insects and Spider Mites on Cotton in 19531

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Abstract
Six experiments (expt.) using 0.1-acre field plots in randomized blocks were conducted. All insecticides were applied as dusts in expt. 1. Metacide, 2%, did not control the boll weevil. The remaining treatments (toxaphene 20%, 3-5-40, 3-5-40 (special mixture), BHC 6% plus DDT 10%, 3-5-0, and 5 mixtures containing BHC gamma 3% plus DDT 5% plus either special oil, aramite 2%, Aramite 4%, parathion 1%, or Metacide 1%) all gave good boll weevil control and small increased yields. In expt. 2, 8 dust mixtures (toxaphene 20-sulfur 40, aldrin 2.5-DDT 5 -sulfur 40, dieldrin 1.5-DDT 5-sulfur 40, Strobane 20, heptachlor 2.5-DDT 5-sulfur 40, malathion 4, 3-5-40, and methyl parathion 2.5-DDT 5) all gave good boll weevil control, and with the exception of malathion, all gave substantial increased yields over the untreated checks. The greatest increased yields were obtained from methyl parathion 2.5-DDT 5, toxaphene 20-sulfur 40, and 3-5-40 dusts. In expts. 3 and 4, 9 sprays (malathion, Metacide, BHC-DDT, methyl parathion, endrin, dieldrin-endrin, aldrin-DDT, dieldrin-DDT, and heptachlor-DDT) when compared with dusts of toxaphene 20% plus sulfur 40%, 3-5-40, and 3-5-40 alternated with calcium arsenate all gave good boll weevil control followed by increased yields over the untreated checks. In expt. 5, aldrin 2.5% plus DDT 5% and 3-5-40 alternated with calcium arsenate both gave satisfactory boll weevil control and increased yields over the untreated checks. In expt. 6, 3-5-40 gave better boll weevil control than either chlorthion 2.5% plus DDT 5% or chlorthion 5% plus DDT 5% dusts but did not yield so well as the chlorthion 2.5% plus DDT 5% dust.

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