New Dispersion additive for suspension concentrate formulations
Ingo Fleute-Schlachter1¹, Helmut Baltruschat² and Ewald Sieverding¹ ; Proceedings of the 7th International Symposium on Adjuvants for Agrochemicals (ISAA2004) 8 – 12 November 2004, Cape Town, South Africa.
Abstract: As an alternative to nonylphenol ethoxylates (NPE), a novel class of dispersing additives was synthesized by reacting styrene oxide and ethylene oxide to a starting alcohol. A suspension concentrate (SC) formulation based on sulphur (A) was made with an optimized member of this new class. It was compared with a formulation utilizing a commonly used ethoxylated tristyrylphenol phosphate (B) and with a commercial sulphur formulation (C). Storage stability was determined by an analytical centrifuge (Lumifuge). The new dispersing additive stabilizes an SC formulation and shows some wetting properties. In the second part, the above mentioned three formulations were tested for their biological efficacy to control powdery mildew. Barley plants were sprayed with various concentrations of sulphur. Subsequently, leaf segments were cut from the plants and placed onto agar. The leaves were inoculated and the disease was assessed at seven days after treatment. Microscopic examination of the leaves after drying of the sprayed formulations confirmed that formulation A was noticeably more homogeneously distributed on the leaf surface than B. The best control of powdery mildew was obtained with formulation A, followed by B and C. At the highest concentration tested, 2000 ppm S, formulation A caused no adverse effects on leaves. At this concentration, leaves treated with B, and in particular with C, showed some necrosis..
Key words: Dispersing additive • Suspension concentrate • Wetting agent • Sulphur • Storage stability • LUMiFuge
¹ Degussa AG, Goldschmidt Industrial Specialties, Goldschmidtstr. 100, 45127 Essen, Germany, ² 2Institutes of Phytopathology and Applied Zoology, University of Gießen, Heinrich-Buff-Ring 26-32, 35392 Gießen, Germany.Contact us
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