How long can an aryloxyphenoxypropionate herbicide be kept in the tank without losing efficacy?

Aliverdi, Akbar; Taheri, Shahram

doi:10.48311/jcp.2024.1654

How long can an aryloxyphenoxypropionate herbicide be kept in the tank without losing efficacy?

https://doi.org/10.48311/jcp.2024.1654

Volume 13, Issue 1
March 2024

Pages 45-53

Document Type : Original Research

Authors

A. Aliverdi

S. Taheri

Department of Plant Production and Genetics, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran.

Abstract

Sometimes, the spray solution must be stored for some time. This study aimed to answer the following questions: how long can an aryloxyphenoxypropionate herbicide be kept in the tank without losing efficacy? Is it dependent on pH? The experiment was designed as a completely randomized design with three factors including the labeled dose of herbicides (clodinafop, cyhalofop, diclofop, fenoxaprop, fluazifop, haloxyfop, propaquizafop, and quizalofop), the pH of spray solution (5, 7, and 8), and the storage time of spray solution (0, 12, 24, 36, 48, 60, and 72 h). The efficacy of herbicides on winter wild oat Avena sterilis subsp. ludoviciana Durieu. was not affected by changing the pH of the spray solution when the spray solution was applied immediately after preparation. When the spray solutions were stored, the herbicides' highest and lowest efficacy were generally observed at pH 5 and 9, respectively. At pH 9, except for fluazifop and haloxyfop, the effectiveness of other herbicides was reduced after 12-h storage of spray solution. The efficacy of all herbicides was reduced with 24-h spray solution storage. At pH 7, the efficacy of cyhalofop and fluazifop remained stable with 72-h storage of their spray solution. In contrast, at pH 5, the efficacy of clodinafop, cyhalofop, diclofop, fluazifop, haloxyfop, and quizalofop remained stable with 72-h storage of their spray solution. Therefore, if it is necessary to keep the spray solution of aryloxyphenoxypropionate herbicides for a short time, it is recommended to use a lower pH to avoid reducing their efficacy.

Keywords

alkaline water

chemical degradation

Hydrolysis

winter wild oat

Subjects

Weed Science (Herbicides)

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