SYMPOSIA PAPER Published: 30 October 2020
STP162720190111

Sticker Adjuvant Development with Enhanced Performance in Rainfastness and Efficacy

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A pesticide's rainfastness, or its ability to withstand rainfall, is an important factor that affects the efficacy of spray-applied foliar pesticides. The development of rainfastness adjuvants is of great significance to avoid pesticide loss due to rainfall and enhance its efficacy, thus reducing the usage amount of pesticides. Generally, there are two mechanisms for rainfastness: fast uptake by the plant (spreader) and strong adhesion to the surface (sticker). Herein, polymer stickers were used for rainfastness performance enhancement. We built up the rainfastness testing capability in the lab, validated the testing process, and and verified the technical hypothesis, thus developing a high-performance polymer sticker with good EPA status. The developed sticker showed excellent performance in lab evaluations with various pesticide formulations; more pesticide could clearly be retained after simulated rainfall washoff while incorporating the sticker. Furthermore, the bioassay test, which used a plant growth regulator as a research active, showed a dramatically enhanced inhibition ratio compared with a sample without a sticker adjuvant under conditions of no rain and heavy rain. Moreover, in the field test, incorporating the sticker adjuvant further improved the weed control effect of glufosinate to resist rainfall.

Author Information

Lu, Wei
Dow Company, Shanghai, CN
Zhong, Ling
Dow Company, Shanghai, CN
Woelfle-Gupta, Caroline
Dow Company, Freeport, TX, US
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Pages: 162–176
DOI: 10.1520/STP162720190111
ISBN-EB: 978-0-8031-7701-7
ISBN-13: 978-0-8031-7700-0