Rotating away from multi-site fungicide restriction concerns

2023 was the first year that all muti-site chemistries were restricted in some way. These chemistries, including mancozeb, chlorothalonil (found in Bravo^® ZN fungicide), and captan, have historically been the foundation of a grower’s spray program, with specialized single-site chemistries used when pressure is high or quality is paramount.  

Now the tables have turned. 

Single-site chemistries – such as those in group 3, 7, 9 and 11 – are becoming the backbone of crop protection programs. 

One catch with using single-site chemistry as the primary component of a spray program is the risk of fungicide resistance developing. To lower the opportunity for resistance to develop in single-site chemistries, careful consideration and rotation of chemistry is vital.  

The Fungicide Resistance Action Committee (FRAC) is a specialist technical group of CropLife International that provide guidelines to slow the development of resistance. FRAC tells us that one of the primary ways to slow resistance is to rotate between different groups of chemistry (those 3, 7, 9 and 11 groups mentioned earlier). Another strategy is to use the multi-site chemistry strategically to break up single-site chemistry applications. Pre-mixing chemistries together is also an effective way to slow resistance.   

Get more information on the guidelines provided by FRAC. 

Why Aprovia^®? 

Aprovia^® fungicide is a single-site chemistry powered by Solatenol^®, an active ingredient that sticks and stays where you put it. Once applied, Solatenol^® binds quickly to the wax layer of the plant, creating a layer of protection on the outside of the leaf. Binding to the waxy layer is beneficial for many reasons, including long-lasting disease control. 

Aprovia^® offers a broad crop and pest label as well as short re-entry and pre-harvest intervals that allow more freedom to scout, harvest or tie the crop at the right time.

Aprovia^® in action

In peppers, 96% of fruit treated with Aprovia^® were free of anthracnose, while 46% of peppers in untreated plots had anthracnose symptoms.

Source: External data from PDMR 17:V050 , ON, 2022. Twelve applications were made on a seven-day interval beginning at flowering. The trial was inoculated with C. acutatum complex after the first fungicide application.

Look below for more information on Aprovia^® and how to integrate it into a crop protection program, or listen to Dave Jefferson explain it here. 

Chemistry Group: 7, SDHI 

Protection against: 

• Anthracnose 
• Alternaria 
• Powdery mildew 
• Gummy stem blight 
• Septoria 
• Stemphylium 
• Cercospora 
• Purple blotch 

Formulation: EC 

Mixing order: L 

Application timing: Before disease development on a 7- to 10-day interval  

Rate: 0.5 to 0.75 L/ac (Rate differs by target pest; refer to the label for rate by pest.) Note: Syngenta recommends a rate of 0.75 L/ac when targeting anthracnose in peppers or Stemphylium in onions, or when conditions are favourable to anthracnose development in tomatoes.  

Remember: not all target pests are registered on all cucurbit species. Application rate may differ by target and cucurbit species. Always consult the product label to confirm the application rate and targets by crop. Leaf spots like gummy stem blight and anthracnose can easily be confused with bacteria-induced angular leaf spot. Keep in mind that Aprovia^® only protects against fungal leaf spots, not bacterial diseases.  

Resistance management: 

Keep resistance management top of mind and rotate with non-Group 7 fungicides (i.e., different FRAC codes) 

• Keep resistance management top of mind and rotate with non-Group 7 fungicides (i.e., different FRAC codes)
• Click on the product logos below to go to the corresponding label and learn more about potential rotation partners.

          
      

​​​​​​​For more information including articles, resources and videos on resistance management, check out Manage Resistance Now. This is a collaborative effort of industry, academia and government experts, brought together by CropLife Canada, to raise awareness and promote the adoption of strategies to manage weed, insect and disease resistance.

Always read and follow label directions. Aprovia^®, Bravo^®, Miravis^®, Quadris Top^®, Solatenol^®, Switch^® and the Syngenta logo are trademarks of a Syngenta Group Company. Allegro^® is a trademark of ISK Biosciences Corporation. Other trademarks are property of their respective owners.