Articles
Advancing control strategies for soil-borne and foliar pathogens in Michigan asparagus
Article number
1376_30
Pages
217 – 224
Language
English
Abstract
Michigan is the largest producer of asparagus in the United States.
Crown and root rot, caused by Fusarium proliferatum, Fusarium oxysporum f. sp. asparagi (FOA), and/or Phytophthora asparagi reduces spear quality and yield, and plant longevity.
Purple spot, incited by Stemphylium vesicarium, blemishes the spears and causes premature defoliation of the fern affecting subsequent yields.
Biorationals and fungicides were evaluated in the greenhouse on asparagus seedlings inoculated with FOA. Glomus spp., Streptomyces lydicus, Streptomyces griseoviridis, or the fungicide fludioxonil were applied.
Seedlings drenched with fludioxonil had healthier crowns than those that were not treated and had increased fern weight compared to the S. lydicus and Glomus spp. treatments.
A field study comparing fungicide soil treatments applied post emergence included the following: mefenoxam, fluopicolide, thiophanate-methyl, fludioxonil, oxathiopiprolin, penthiopyrad, and pydiflumetofen.
Crowns were dug the following spring, weighed, and rated from 1 (low) to 4 (high) for root mass.
Fludioxonil applications resulted in significantly more crowns with the highest root mass than the untreated and several of the other fungicide treatments included in the study.
The TOM-CAST disease forecasting program is used by Michigan growers to time fungicide sprays to protect the fern from purple spot.
New fungicides were tested in conjunction with TOM-CAST for purple spot efficacy and longevity of control on the fern.
Pydiflumetofen + fludioxonil provided the best and longest level of protection under heavy disease pressure.
Results can be used to develop strategies to limit soil-borne and foliar pathogens to improve plant health.
Crown and root rot, caused by Fusarium proliferatum, Fusarium oxysporum f. sp. asparagi (FOA), and/or Phytophthora asparagi reduces spear quality and yield, and plant longevity.
Purple spot, incited by Stemphylium vesicarium, blemishes the spears and causes premature defoliation of the fern affecting subsequent yields.
Biorationals and fungicides were evaluated in the greenhouse on asparagus seedlings inoculated with FOA. Glomus spp., Streptomyces lydicus, Streptomyces griseoviridis, or the fungicide fludioxonil were applied.
Seedlings drenched with fludioxonil had healthier crowns than those that were not treated and had increased fern weight compared to the S. lydicus and Glomus spp. treatments.
A field study comparing fungicide soil treatments applied post emergence included the following: mefenoxam, fluopicolide, thiophanate-methyl, fludioxonil, oxathiopiprolin, penthiopyrad, and pydiflumetofen.
Crowns were dug the following spring, weighed, and rated from 1 (low) to 4 (high) for root mass.
Fludioxonil applications resulted in significantly more crowns with the highest root mass than the untreated and several of the other fungicide treatments included in the study.
The TOM-CAST disease forecasting program is used by Michigan growers to time fungicide sprays to protect the fern from purple spot.
New fungicides were tested in conjunction with TOM-CAST for purple spot efficacy and longevity of control on the fern.
Pydiflumetofen + fludioxonil provided the best and longest level of protection under heavy disease pressure.
Results can be used to develop strategies to limit soil-borne and foliar pathogens to improve plant health.
Publication
Authors
B.R. Harlan, M.K. Hausbeck
Keywords
purple spot, Fusarium crown and root rot, Stemphylium vesicarium, Fusarium proliferatum, Fusarium oxysporum, fungicide, biorational
Groups involved
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