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Use of Pinolene or Other Spray Adjuvants with Iprodione for Improved Control of Sclerotinia Blight on Peanut¹

Authors: F. D. Smith , P. M. Phipps , R. J. Stipes

Abstract

Various spray adjuvants were evaluated in 1985 and 1986 with iprodione (Rovral®) for improved control of Sclerotinia blight of peanut, caused by Sclerotinia minor (Jagger) Kohn. Treatments were applied three times on demand, using high-volume nozzles to deliver 335 L/ha or low-volume nozzles to deliver 140 L/ha. Acetic acid, Buffer P.S.®, Chem Wert Plus, hydrochloric acid, pinolene (Nu-Film-17®), SoyOil 937® and Spray-Aide were tested with iprodione in 1985, and ChemWett Plus®, pinolene and Spray-Aide were chosen for additional trials in 1986. Treatments of iprodione at 1.12 kg/ha with pinolene at 0.42% in low-volume sprays and 0.18% (vv) in high-volume sprays produced the greatest yield of peanut during both years. Additional testing of iprodione with pinolene used only high-volume sprays, and these treatments were applied on demand: three times in 1987 and twice in 1988, 1989 and 1990. Yield and value of peanut over the 6-yr period of high-volume treatments were increased significantly (P = 0.05) by iprodione with pinolene, compared to iprodione alone. The addition of pinolene increased the mean yield by 348 kg/ha and value of peanut by $291/ha. The cost of using pinolene as an adjuvant averaged $6.95ha each year. Disease incidence was 12% lower in plots treated with iprodione and pinolene, compared to iprodione alone, but this difference was not significant over the period.

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Keywords: Arachis hypogaea, Groundnut, Sclerotinia blight

How to Cite: Smith, F. , Phipps, P. & Stipes, R. (1991) “Use of Pinolene or Other Spray Adjuvants with Iprodione for Improved Control of Sclerotinia Blight on Peanut¹”, Peanut Science. 18(2). doi: https://doi.org/10.3146/i0095-3679-18-2-9