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Influence of soil properties and soil moisture on the efficacy of indaziflam and flumioxazin on Kochia scoparia L.
Author(s) -
Sebastian Derek J,
Nissen Scott J,
Westra Phil,
Shaner Dale L,
Butters Greg
Publication year - 2017
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.4300
Subject(s) - agronomy , phytotoxicity , environmental science , water content , weed , weed control , moisture , germination , scoparia , soil water , biology , chemistry , soil science , geotechnical engineering , organic chemistry , engineering
BACKGROUND Kochia ( Kochia scoparia L.) is a highly competitive, non‐native weed found throughout the western United States. Flumioxazin and indaziflam are two broad‐spectrum pre‐emergence herbicides that can control kochia in a variety of crop and non‐crop situations; however, under dry conditions, these herbicides sometimes fail to control this important weed. There is very little information describing the effect of soil properties and soil moisture on the efficacy of these herbicides. RESULTS Soil organic matter ( SOM ) explained the highest proportion of variability in predicting the herbicide dose required for 80% kochia growth reduction ( GR 80 ) for flumioxazin and indaziflam ( R 2 = 0.72 and 0.79 respectively). SOM had a greater impact on flumioxazin phytotoxicity compared to indaziflam. Flumioxazin and indaziflam kochia phytotoxicity was greatly reduced at soil water potentials below −200 kPa. CONCLUSION Kochia can germinate at soil moisture potentials below the moisture required for flumioxazin and indaziflam activation, which means that kochia control is greatly influenced by the complex interaction between soil physical properties and soil moisture. This research can be used to gain a better understanding of how and why some weeds, like kochia, are so difficult to manage even with herbicides that normally provide excellent control. © 2016 Society of Chemical Industry