Effect of weather conditions on efficacy and residue amount of two acetyl-CoA carboxylase inhibiting herbicides in spinach

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41210%2F25%3A102334" target="_blank" >RIV/60460709:41210/25:102334 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22330/25:43932310

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/full/10.1111/wre.70028" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1111/wre.70028</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/wre.70028" target="_blank" >10.1111/wre.70028</a>

Result language

angličtina

Original language name

Effect of weather conditions on efficacy and residue amount of two acetyl-CoA carboxylase inhibiting herbicides in spinach

Original language description

The risk of contamination by the acetyl-CoA carboxylase inhibiting herbicides fluazifop-P-butyl and quizalofop-P-ethyl is significant, particularly in short-season vegetables like spinach. This study examined meteorological factors affecting their efficacy and residue levels in spinach. Field trials were conducted in Prague, Czech Republic, in 2022 and 2023, using Echinochloa crus-galli seeds at 150 seeds/m2. Herbicides were applied at the four-true-leaf growth stage, with fluazifop-P-butyl at 110 g/ha and quizalofop-P-ethyl at 40 g/ha, under three irrigation regimes. Statistical analysis showed significant effects of temperature and irrigation on herbicide efficacy against E. crus-galli and residue levels in spinach leaves. Fluazifop-P-butyl residues were approximately 10 times greater (287-480 mu g/kg in 2022 and 76-91 mu g/kg in 2023) than quizalofop-P-ethyl (25-42 mu g/kg in 2022 and 5-9 mu g/kg in 2023), even though its maximum residue level (MRL) is 10 times lower (20 mu g/kg for fluazifop-P-butyl vs. 200 mu g/kg for quizalofop-P-ethyl). Residues were notably higher in 2022 likely due to lower temperatures (mean temperature in the growing period 11.2 degrees C), which slowed degradation of herbicides. Irrigation shortly after herbicide application (20 mm) reduced residue levels but decreased efficacy. Warmer conditions in 2023 enhanced efficacy, with a mean daily temperature of 6.3 degrees C higher during the application-to-harvest period. Herbicide degradation was more temperature-dependent than efficacy. Fluazifop-P-butyl is unsuitable for spinach due to the high risk of exceeding MRL values, while quizalofop-P-ethyl can be used safely under varied weather conditions without exceeding MRL.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40106 - Agronomy, plant breeding and plant protection; (Agricultural biotechnology to be 4.4)

Project

<a href="/en/project/QL24020453" target="_blank" >QL24020453: Methods of integrated pest management in vegetable growing with respect to changing spectrum of active substances of pesticides</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Weed Research

ISSN

0043-1737

e-ISSN

1365-3180

Volume of the periodical

65

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

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UT code for WoS article

001561125400002

EID of the result in the Scopus database

2-s2.0-105009768739