This weeks blog is brought to you by Caelyn Shearer, Grower Specialist / Eastern Manitoba / DuPont Crop Protection
There are many broadleaf crops grown in Manitoba that are susceptible to white mould and sclerotinia such as: canola, sunflowers, soybeans, and pulse crops. When host crops are grown consecutively on the same field, the likelihood of a disease outbreak is increased. Sclerotia bodies from previous infections can survive in the soil for up to 7 years. Under the right environmental conditions, the sclerotia will germinate into apothecia in the spring. Sclerotia are most likely to germinate when there is high humidity, soils are moist, and temperatures range from 15-25 degrees within the crop canopy. Apothecia look like small mushrooms. When they reach sexual maturity millions of spores are released. The spores target flowering crops for nutrients, then when the petals begin to drop during the maturing process; they land on the leaf tissue and stems creating small lesions (typically oval and white or pale brown in colour). The lesions appear as a result of the pathogen growing into the stem. Inside the stem, the pathogen develops new sclerotia (see photo 1). Sclerotinia causes the plant to ripen prematurely, resulting in the potential for significant yield loss (see photo 2 and 3). When the field is harvested, some sclerotia end up with the seed while the majority falls to the ground from the stem of the plant, beginning to whole process again. The nature of this disease is why rotation to non-susceptible crops, controlling weeds that can act as hosts and prevention with fungicides is essential!
Thanks to years of research, fungicides were developed as a tool to help growers decrease the severity and incidence of sclerotinia white mould in their fields. Fungicides help protect crops against many damaging diseases, that can significantly impact yield if unmanaged. By using a fungicide like DuPont™ Acapela®, you are protecting against disease, providing insurance for your crop and maximizing the full yield potential. Acapela® is a group 11 strobilurin fungicide for control of sclerotinia white mould as well as a broad spectrum of leaf diseases in canola, cereals, soybeans, pulses, and corn. Acapela® has 4 unique movement properties that provide superior coverage, delivering consistent and powerful disease control under a variety of conditions:
- Vapour Activity- creates a gas like barrier that moves locally over the leaf tissue
- Xylem Systemic Activity- movement through the leaf tissue to distribute across the entire leaf
- Translaminar Movement-movement through the leaf to protect the top and bottom surfaces
- Wax Diffusion- provides more consistent coverage across the leaf and stem surface
Acapela® is the only strobilurin fungicide registered to control sclerotinia, providing healthier crops and a higher yielding potential. Acapela® is an extremely flexible fungicide for a wide variety of crops and diseases, making it one of the most convenient products to have on hand.
To protect against white mould in soybeans, spraying must occur around the R1 to R2 stages (beginning to full bloom), before the disease begins to form, at the 27 acres/jug rate. If mould symptoms are already present in the field it is too late for a fungicide application. A follow up application of Acapela® 7-10 days later is beneficial when white mould pressure is high. For foliar diseases, optimal timing is between the R2 and R3 growth stage (full bloom to beginning pod) at the 27-40 acres/jug rate depending on disease pressure.
For control of sclerotinia in canola, Acapela® should be applied at the 20%-50% bloom stage (between 10 and 20 flowers open on the main stem) before the development of disease at the 30 acres/jug rate. If disease pressure is extremely high, follow up with a second application 7-14 days later with a fungicide from a different mode of action.
To protect pulses from white mould, make a preventative application of Acapela® at the 27 acres/jug rate near the beginning of bloom and a follow up application with a different mode of action 7-10 days later. For foliar diseases, apply Acapela® prior to disease development and continue on a 7-14 day interval at the 27-40 acres/jug rate, depending on disease pressure.
To optimize yield and control flag leaf diseases in cereals, apply Acapela® at the 40-50 acres/jug rate at the T2 or flag leaf stage. Protecting the crop at this stage has been shown to significantly increase yield.
For optimal control of Northern Corn Leaf Blight, apply Acapela ® between full tassel (VT) and milk stage (R3) at 30-45 acres/jug.
For more information on Acapela® or other DuPont products please contact:
Caelyn Shearer | Grower Specialist | Eastern Manitoba| DuPont Crop Protection
Cell: (204) 918-8356
Please visit our Canada website at cropprotection.dupont.ca
As with all crop protection products, read and follow label instructions carefully.
The DuPont Oval Logo, DuPont™, Acapela®, are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its affiliates. E. I. du Pont Canada Company is a licensee. Member of CropLife Canada.
- Sclerotia bodies inside soybean stem
- Acapela® Treated vs. Untreated white mould in soybeans
- 3.5 bushel/acre yield increase
- Untreated on left vs. Acapela® Treated on right
- 3.5 bushel/acre yield increase
Photo credits: Caelyn Shearer, Rosser Manitoba, September 9, 2015