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Thursday, August 12, 2021

Proline® 480 SC Foliar Fungicide on Grain Corn – Field Scale MDA Trials

Proline heatmap thumb

Trial Objective

  • Demonstrate that Proline® 480 SC Foliar Fungicide applied when corn is silking helps suppress the development of the disease, Fusarium graminearum (Gibberella zeae), which can produce the mycotoxin, deoxynivalenol (DON or vomitoxin).
  • Demonstrate that in the presence of Fusarium graminearum (Gibberella zeae), potential yield can be maintained or have a positive advantage when corn plants are treated with Proline® 480 SC Foliar Fungicide compared to non-treated corn plants.

Research Site Details

  • Mapping Options
    • Map in Climate FieldView™ at planting.
    • Have summer assistant walk the field outline with a Climate backpack.
  • Proline® 480 SC Foliar Fungicide Application
    • Map spraying area with Climate FieldView™.
    • If possible, leave at least two untreated passes in the middle of the field (inconsecutive about 1/3 to 2/3 of the field).
    • Spray passes should align with combine width.
    • If plot cooperator is spraying to control western bean cutworm (WBC), then the section of the field with the trial should also include the insecticide application.
    • Use 420 ml/ha (170 ml/acre) of Proline® 480 SC Foliar Fungicide in a minimum water volume of 175 ml/ha (19 gal/acre). A jug of Proline® 480 SC Foliar Fungicide 5.1 L covers 12.14 hectares (30 acres).
    • No strict timing for application; however, it should be applied between full silk and browning of silk. Can be sprayed when plot cooperators spray for WBC.
  • Evaluations
    • Use drone flights to help capture interesting observations.
    • Optional – Capture fungal disease severity (FSEV) rating at R3 to R5 growth stages (Figure 1).
    • Capture staygreen (STGRN) (Figure 2) and Gibberella ear rot severity (ERSR) (Figure 3) ratings at R5 growth stage.
    • At harvest, capture ratings for root lodging (RTLP), stalk lodging (STLP), intactness (INT), average yield (YLD), percent moisture content (MST), and test weight (TWT).
    • Collect grain samples at harvest for DON and Zearalenone mycotoxin laboratory analysis (MDIC).
    • Ratings and percentages are assessed and recorded by walking the field and reviewing representative areas for each treatment.
Foliar disease rating comparison scale

Figure 1. Foliar disease rating comparison scale for capturing fungal disease severity (FSEV) rating.

 Staygreen rating comparison scale.

Figure 2. Staygreen rating comparison scale.

Gibberella ear rot comparison rating scale

Figure 3. Gibberella ear rot comparison rating scale.

Table 1. Agronomic Information for Each Location
Location Soil Type Previous Crop Tillage Type Planting Date Harvest Date
Lambeth, Ontario Silt Loam Edible Bean Conservation (minimum) 06/08/19 11/19/19
Ennotville, Ontario Loam Soybean Conventional 06/03/19 11/26/19
St. Agatha, Ontario Loam Grass Strip-Till 06/04/19 11/26/19
Ste-Francoise-de-Lotbinière, Quebec Sandy Loam Spring Wheat Conservation (minimum) 05/16/20 07/11/20
Parisville, Quebec Sand Barley Conservation (minimum) 05/17/20 11/14/20
Sarnia, Ontario Clay Loam Winter Wheat Conventional 05/27/20 11/29/20
Watford, Ontario Clay Loam Soybean Conventional 05/31/20 11/2120
St. Agatha, Ontario Loamy Sand Grain Corn Strip-till 06/05/20 10/20/20
Gads Hill, Ontario Silt Clay Loam Soybean Conventional 04/27/20 10/14/20
Lambeth, Ontario Loam Grain Corn Conventional 05/11/20 10/26/20
Saint-Anicet, Quebec Loam Grain Corn Conventional 05/12/20 10/16/20
Saint-Denis-sur-Richelieu, Quebec Silty Clay Soybean Conservation (minimum) 05/06/20 11/05/20
Finch, Ontario Sandy Loam Soybean Conservation (minimum) 05/05/20 11/3/20
Picton, Ontario Sandy Loam Edible Bean Conservation (minimum) 05/10/20 11/20/20

Understanding the Results

  • In these field scale trials, Proline® 480 SC Foliar Fungicide showed positive results for staygreen, average yield increase, reduction in Gibberella ear rot, and DON suppression (Figures 4 thru 9).
  • There was minimal difference in moisture content between the treated and untreated samples (+0.24% greater for Proline® 480 SC Foliar Funigicide treated corn).
  • Gibberella ear rot infections in 2019 were very low to none which resulted in very low DON levels. Levels of both were higher in 2020.
  • Compared to untreated plots, the average estimated yield difference at 18 Eastern Canada locations (2019 and 2020) was +2.3 bu/acre when Proline® 480 SC Foliar Fungicide was used and Gibberella ear rot pressure was absent.
  • Compared to untreated plots, the average DON reduction in 18 Eastern Canada locations (2019 and 2020) was 60% when Proline® 480 SC Foliar Fungicide was used.
  • Compared to the untreated check, the average estimated yield difference was +4.8 bu/acre in 5 Eastern Canada locations (2019 and 2020) when Proline® 480 SC Foliar Fungicide was used and Gibberella ear rot pressure was present.
  • When Gibberella ear rot pressure was present, the average estimated development of DON in 6 Eastern Canada locations (2019 and 2020) was 1.04 ppm or 55.6% less when the corn was treated with Proline® 480 SC Foliar Fungicide compared to the untreated check.
Average percent of DON development based on Gibberella ear rot pressure

Figure 4. Average percent of DON development based on Gibberella ear rot pressure in Eastern Canada in 2019 and 2020.

Proline 480 SC Foliar Fungicide application areas and estimated disease occurrence

Figure 5. Proline® 480 SC Foliar Fungicide application areas (left) and estimated disease occurrence (right) on August 22, 2020, Ontario, Canada.

Proline 480 SC Foliar Fungicide application areas and estimated disease occurrence

Figure 6. Proline® 480 SC Foliar Fungicide application areas (left) and estimated disease occurrence (right) on September 3, 2020, Ontario, Canada.

Proline 480 SC Foliar Fungicide application areas and estimated disease occurrence

Figure 7. Proline® 480 SC Foliar Fungicide application areas (left) and estimated disease occurrence (right) on September 13, 2020, Ontario, Canada.

Climate Fieldview imagery showing the response comparisons of Proline 480 SC Foliar Fungicide

Figure 8. Climate Fieldview™ imagery showing the response comparisons of Proline® 480 SC Foliar Fungicide after an August 3, 2019 application. Ontario, Canada. .

 Average yield results from the same Ontario, Canada field in 2019 between Proline 480 SC Foliar Fungicide and untreated check.

Figure 9. Average yield results from the same Ontario, Canada field in 2019 between Proline® 480 SC Foliar Fungicide and untreated check. The fungicide advantage was an average of 8 bu/acre.

Key Learnings

  • In these trials, applying Proline® 480 SC foliar fungicide at silking provided an average increase in yield of 2.3 bu/acre compared to untreated corn.
  • Proline® 480 SC Foliar Fungicide demonstrated an average yield increase of 4.8 bu/acre and 55.6% decrease in DON development in these trials when Gibberella ear rot pressure was present.