Press Release •  05/12/2023

Updated sprayer hygiene and winter maintenance advice launched by Corteva today

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As farmers and contractors begin their winter machinery maintenance schedules, Corteva Agriscience has produced an updated best practice advice video highlighting the benefits of good sprayer hygiene.

The video is presented by independent spray application specialist Tom Robinson who returns to the Stowell Park Estate in Gloucestershire to visit farm foreman Andrew Myatt to see how his robust winter servicing programme optimised sprayer performance in 2023.

Andrew, a former Sprayer Operator of the Year, says his time spent in the workshop last winter was well worth it as it meant a busy spring of spraying was uninterrupted by repairs or servicing.

Alongside scheduled maintenance, Andrew followed Corteva’s best practice application advice relating to sprayer hygiene and spray concentration rates when applying Univoq, Corteva’s novel fungicide containing Inatreq active.

The full video is published now at for users in the UK, and at for sprayer operators in Ireland.

Tom said: “Andrew is a very knowledgeable and experienced operator and in this new video he is able to show the practical steps he took to look after his machine as well as the positive impact it had on operational performance.

“In 2022 Andrew had minor issues with his sprayer’s check valves when applying Inatreq active, but servicing and following Corteva’s best practice application advice led to him eradicating the problem this spring.

“The video has been made with operators in mind, showing in detail how to dismantle, replace and reassemble wearing parts on the sprayer which need attention during winter maintenance.” 

December and January are the most popular months for machinery maintenance, and Andrew demonstrates how he uses the time to focus on servicing components which most frequently come into contact with chemicals.

A new addition for the video this year is the servicing of a Ramsay pressure set – more commonly known as a Ramsay box – and Andrew’s approach to replacing the pistons in the nozzles of his sprayer.

He also shares how to service his machine’s pump by replacing its diaphragms as well as explaining how chemical residues can cause them to wear, distort and split if not replaced annually. 

Out in the field, there is a demonstration of Andrew’s post-application washout procedure, rinsing, and a general inspection of the key parts of the machine.


For 2024 applications of any product containing Inatreq active, Corteva has issued the following best practice guidance: 

●   The maximum concentration should not exceed 2l of product in 285l of water per hectare – a 0.7% concentration. 

●   Inatreq spray solutions should not be left in the spray tank overnight – follow the recommendations on the label – and operators should rinse the sprayer tank, pump and lines through at the end of each day’s spraying.

●   Inatreq should not be used in sprayers equipped with pulse width modulation technology.

●   Corteva recommends replacing pump diaphragms annually, ideally with NBR or Blue flex parts. Abide by the pump manufacturer’s service recommendations.

●   For anti-drip diaphragms, EPDM parts are recommended, or operators can modify air shut-off anti-drip valves to use Teflon replacements. If neither of these options are possible, Corteva recommends replacing all existing pneumatic/automated anti-drip diaphragms/pistons with new before spraying products containing Inatreq. It’s important to check these after use too.

●   If your sprayer has a Ramsay box, you should replace the diaphragm seal during winter maintenance.

For more information go to for additional resources and up to date news. 

Visit the Inatreq advice webpage




About Corteva

Corteva, Inc. is a publicly traded, global pure-play agriculture company that provides farmers around the world with the most complete portfolio in the industry - including a balanced and diverse mix of seed, crop protection and digital solutions focused on maximising productivity to enhance yield and profitability. With some of the most recognised brands in agriculture and an industry-leading product and technology pipeline well positioned to drive growth, the company is committed to working with stakeholders throughout the food system as it fulfils its promise to enrich the lives of those who produce and those who consume, ensuring progress for generations to come. Corteva Agriscience became an independent public company on June 1, 2019 and was previously the Agriculture Division of DowDuPont. More information can be found at


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