full-logo wordmark-logo call email call-with-color email-with-color berries corn cotton grapes peanuts rice soybeans tree-fruit tree-nuts vegetables wheat other customerfocus employees innovation professional-excellence stewardship teamwork audio play pause disease-control insect-control pgrs-and-protectants seed-treatments soil-health weed-control fall spring summer winter envelope facebook linkedin twitter omri-logo sustainable-solutions-logo wayfinder-3 wayfinder-2 wayfinder-1 sumitomo-logo pdf minus pin check-mark grid website home hamburger chevron close expand search exclamation
Jump to Header Jump to Main Content Jump to Footer

As the impact of the COVID-19 (coronavirus) pandemic continues to expand, Valent U.S.A.'s top priority is, and will continue to be, the safety and well-being of our employees, customers, partners, and growers.

We have implemented new policies to minimize exposure risks, including a work-from-home policy, canceling all travel and in-person meetings, following social distancing and other recommendations from the CDC, and strictly adhering to local government requirements.

We remain committed to helping our distribution partners, grower customers, and their families weather this time of uncertainty by ensuring that they have the products, solutions, and services necessary to manage their 2020 crops. Read more about how we are supporting our partners here.

animated-logo
  • Find a Label/SDS
Search Valent
  • Find a:
    • Label/SDS
    • Retailer
    • Rep
  • Careers
  • Channel Portal
  • Products
    • Product Finder
    • Soybean Herbicides
    • Sustainable Products
    • Professional Products
  • Crops
  • Advancing Ag
  • Resources & Education
    • Education
    • Events
    • Programs & Offers
  • Our Story
    • Our Companies and Sumitomo Chemical
    • Sustainable Agriculture
    • Innovation
    • Customer Commitment
    • Partnerships
    • Work at Valent
    • News
  • Find a:
    • Label/SDS
    • Retailer
    • Rep
  • Careers
  • Channel Portal
Search Valent
Growers

Start Early, Stay Persistent on Apple Scab and Powdery Mildew Management


Apple growers know the headache that comes with managing scab or powdery mildew each season. Prevention is key to stay ahead of these diseases and now is the time to prepare your plan for next season.
 
Apple scab and powdery mildew overwinter in the orchard and become more severe based on in-season weather. Growers should not rely on previous pressure to predict the severity of the upcoming season. Growers must assume these diseases will be present and should manage them proactively to prevent primary and secondary infections.
 
These two diseases can affect apple growing areas differently depending on climate. Apple scab is a perennial problem in cool, wet, temperate production regions like the Northeast, Upper Midwest and west of the Cascade Mountains. Powdery mildew is most problematic in areas with mild, dry weather during spring and early summer like arid portions of the Pacific Northwest. Through cultural practices and chemical protection options, such as new Excalia™ Fungicide, growers can manage these diseases effectively. Excalia is a new tool that helps growers start clean by controlling early-season primary infections to minimize secondary spread of scab and powdery mildew.
 
Best Management Practices:
 
Apple Scab:
  • Remove all fallen leaves and fruit in the fall to reduce infection potential next spring.
  • Apply a preventive fungicide from green tip through petal fall, during the primary infection period.
  • Continue to manage secondary spread with an appropriate fungicide program.
 
Powdery Mildew:
  • In the fall, remove any primary sources of infection, including infected terminals by dormant pruning.
  • Apply a preventive fungicide from green tip through petal fall.
  • Inspect new growth in-season for early infections. The key is to control early infections beginning at the primary stage (bud break) through the period of active shoot growth.
 
Reducing Diseases
 
With careful scouting and removal of infested leaves and fruit, growers can help proactively manage scab and powdery mildew. Additionally, there are chemical solutions that can protect orchards from the start of the season. Excalia is a new succinate dehydrogenase inhibitor SDHI (Group 7) fungicide that offers fast, locally systemic movement into the plant tissue to quickly form a complete zone of protection on the leaves for powerful early-season disease protection.
 
Proactive Resistance Management
 
Being proactive with fungicide applications will help prevent resistance from developing. This is critical to ensure that tools continue to be effective against these hard to manage pathogens for future seasons. Fungicide Resistance Action Committee (FRAC) guidelines for managing SDHI resistance include:
  • Use product preventively or early in outbreak.
  • Limit the number of SDHI applications per season; use no more than 2 consecutive applications.
  • SDHIs should be premixed or tank-mixed with other effective modes of action.
  • Practice rotating SDHIs with other modes of action.
 
Excalia is most effective for early-season use for quick control, then rotate to other modes of action (FRAC numbers) after petal fall. To learn more about Excalia, visit Valent.com/Excalia or talk to your retailer.
 
Always read and follow label instructions.
 
* First published by the U.S. Apple Association as part of their Thought Leadership series. Republished on the permission of the U.S. Apple Association.
Allison Walston and Greg Clarke Field Market Development Specialists Valent U.S.A.

Global Sites

  • Sumitomo Chemical Co., LTD
  • Valent Canada
  • Valent de México

  • YouTube
  • LinkedIn
  • Twitter

Quick Links

  • Find a Label/SDS
  • Products
  • Professional Products
  • Find a Rep
  • Find a Retailer
  • Careers

Our Companies

  • Valent BioSciences LLC
  • Mycorrhizal Applications LLC
  • Pace International LLC
  • McLaughlin Gormley King (MGK)

Valent is committed to helping growers meet the demand for sustainably grown crops. We meet you where you are, and build on what you're already doing, so you have the ability to take the next step toward a more sustainable, viable and profitable operation. Because when your operation is sustainable, we all win.

  • (925)256-2700
  • Email Us
  • Sitemap
  • Terms of Use
  • Privacy Policy
  • Cookies Notice
  • Trademarks
  • Accessibility

2020 Valent U.S.A. LLC - All Rights Reserved