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Using activator adjuvants with agrochemicals to improve their bioefficacy is an important practice in agriculture. Adjuvants—mostly crop oil concentrates—are needed to ensure the bioefficacy of herbicides from the class of acetyl-CoA carboxylase (Accase) inhibitors. Because of regulatory pressure from the U.S. Environmental Protection Agency, the development and testing of drift technologies has come to the forefront of U.S. application research in the past few years. However, the majority of the drift control agents on the market aim only to reduce the percentage of fine droplets in the spray spectra. There is a strong market need to combine both activator and delivery technology to develop a dual-function adjuvant. The objective of this research was to develop a novel penetrator adjuvant with built-in drift control properties. The adjuvant was based on a crop oil concentrate (COC). Spray droplet spectra for the new adjuvant were determined in still-air conditions using a Sympatec Helos laser diffraction particle size analyzer. The biological effects of this new adjuvant were investigated in comparison to a commercial COC, Agri-Dex, in greenhouse bioassays using fluazifop on green foxtail (Setaria viridis) and clethodim on barnyardgrass (Echinochloa crus-galli). The novel COC affected green foxtail and barnyardgrass similarly as the traditional COC, but at half the typical COC rate. In addition, the new adjuvant significantly reduced the percentage of fine droplets (<105 μm) without negatively affecting the entire spray pattern.
clethodim, fluazifop, crop oil concentrate, adjuvant, drift reduction, amine alkoxylate
Sun, Jinxia S.
Akzonobel Surface Chemistry, Brewster, NY