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Protecting your corn and soybeans is more important than ever

May 27, 2022  Sponsored by Bayer

With a growing financial investment in the health and success of your crops, Delaro® Complete adds a third mode of action to the trusted power of Stratego® PRO. Combining fluopyram (Group 7) with the actives prothioconazole (Group 3) and trifloxystrobin (Group 11) provides enhanced disease control in corn and soybeans under various environmental conditions, working together to combat the toughest diseases including tar spot and white mould.

Todd Woodhouse and Bob Thirlwall, Bayer Market Development Agronomists in South Central Ontario and Southwest Ontario, respectively, have almost 50 years’ combined experience in agronomics and crop management, and have three key recommendations on how to protect your corn and soybeans this season.

#1 – Understand the diseases you should be concerned about

According to Woodhouse, while white mould in soybeans remains the primary disease of concern, in corn there is a wider variety – including, but not limited to common rust, eye spot, Northern corn leaf blight and tar spot. Tar spot was new to Ontario in 2021, and with it brings the potential for high yield impact. “Pre-mature dry-down of corn crops and reduced yield potential present the largest concern,” says Woodhouse, “and based on what was witnessed in Southwest Ontario in 2021, it has the ability to become one of the most serious diseases for farmers to manage.”

#2 – Choose the right product

“Delaro Complete has presented as a top performer against tar spot”, says Woodhouse. While not all parts of Eastern Canada have experience with the disease, preparation is key.  Delaro Complete has also had excellent success at slowing down the development of Northern corn leaf blight and proves itself to be worth the investment in corn. Woodhouse has also seen Delaro Complete do an exceptional job suppressing white mould in soybeans, along with controlling Septoria.

Reviewing detailed results from field scale trials, in corn, Thirlwall saw Delaro Complete exceed expectations across 22 trials that took place throughout Ontario and Quebec in 2020 and 2021. Measured by an increase in yield, fields in Southwest Ontario reported a yield increase of 20-30 bushels per acre – with an average yield scale increase of 11.4 bushels per acre.1 *

Source: 11 Bayer Market Development Trials (2021). Delaro® Complete fungicide applied at VT. Your results may vary depending on agronomic, environmental and pest pressure variables.

Source: 14 Bayer Market Development Small Plot Trials (2020 & 2021). Delaro® Complete fungicide applied at R2. Your results may vary depending on agronomic, environmental and pest pressure variables.

#3 – Apply fungicide at the right time

In soybeans, Thirlwall praises the ability of Delaro Complete to do double duty; farmers can choose to use it for general plant health, or as a yield-saving formula. It can be applied preventatively, or at the first sign of disease from early flowering (R1) to complete pod fill (R5), with R1-R3 being the most effective. With high disease pressure, farmers can also apply a second application 10-14 days later to maximize protection of their soybean yield.

For corn, Delaro Complete offers the addition of fluopyram to the proven performance of Stratego PRO to protect against major leaf diseases, including tar spot. Thirlwall recommends applying Delaro Complete at R1 or silking timing, followed by a second application 10-14 days later if favourable conditions for disease development persist. Catching disease in corn earlier is ideal.  Farmers can also add a half rate of Proline™ to Delaro Complete at R1 timing, to help control Gibberella and Fusarium ear moulds and suppress DON.

Corn field with Delaro Complete and 1/2 rate Proline applied at R1 (silking) –
DKC53-87RIB, Application map compared to harvest map. The grey strip in the image on the left indicates an untreated check strip.

According to Woodhouse, “the best way to measure the impact of Delaro Complete on your field is a comparison of the treated portion of the field to the untreated – Climate FieldView™ makes it easy to perform a region report and know the yield difference before you’ve even left the field.” Leveraging tools like FieldView allow farmers to get ahead of diseases of concern and create a comprehensive management plan to protect your investment.

Farmers are encouraged to talk to their local Bayer representative to learn more about Delaro Complete or visit

*Your results may vary according to agronomic, environmental and pest pressure variables.

1 Source: Eastern Canada Bayer Market Development Field Scale trials (n=1 in 2020 & 21 for 2021).

Services and products offered by The Climate Corporation are subject to the customer agreeing to our Terms of Service. Our services provide estimates or recommendations based on models. These do not guarantee results. Before making financial, risk management and farming decisions, agronomists, commodities brokers and other service professionals should be consulted. More information at FieldView™ is a registered trademark of The Climate Corporation. Used under license.

ALWAYS READ AND FOLLOW LABEL DIRECTIONS. Bayer, Bayer Cross, Delaro®, and Stratego® are registered trademarks of Bayer Group. Bayer CropScience Inc. is a member of CropLife Canada. ©2022 Bayer Group. All rights reserved.


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