Fruit rots can ruin an otherwise marketable harvest. Botrytis in particular can sneak in whether it’s pre-harvest in blueberries, late season in grapes or post-harvest in strawberries. Several tools are available, but with shifts in fungicide sensitivity, how do we best manage these fruit rots?

Know your groups

The Fungicide Resistance Action Committee (FRAC) has a great explanation of classification and mode of action. Click below to watch a short clip on Groups (in the video, they refer to them as “codes”) and labelling.

For example, on the top of the Miravis^® Prime label, you can see that it contains both a Group 7 and Group 12 fungicide.

You know the code, now what?

The best long-term strategy is loss prevention – keep the tools around for as long as possible.

1. Know your groups
2. Plan accordingly
3. Participate in monitoring programs

Here is another short video from FRAC, this time highlighting the general best practices: 

Putting it all together

What are the codes, risks, crops and recommendations?

	Switch®		Miravis® Prime		Inspire® Super
FRAC code	9	12	7	12	3*	9
Resistance risk	Medium	Low to medium	Medium to high	Low to medium	Medium	Medium
Grapes	0.31 to 0.39 kg/acre		0.32 to 0.4 L/acre		0.42 to 0.6 L/acre
Strawberries	0.39 kg/acre		0.4 L/acre		Not registered
Blueberries, highbush1	0.31 to 0.39 kg/acre		0.32 to 0.4 L/acre		0.42 to 0.6 L/acre
Blueberries, lowbush1	0.31 to 0.39 kg/acre		Not registered		0.42 to 0.6 L/acre
Guidelines	No more than two sequential applications.

Notes

* Difenoconazole has no activity against Botrytis.
Inspire Super^® and Switch^® both contain a Group 9.
Switch and Miravis^® Prime both contain a Group 12.

To manage resistance, no more than two sequential applications of the same Group should be used. It’s all about the Group, not the brand.

For example, a Botrytis program in highbush blueberries could be Miravis^® Prime at early bloom, Switch at full bloom and Inspire Super to finish the crop.

Reach out to your Syngenta rep or retail partner if you’d like advice on building a program with resistance management top of mind.

¹ Growing blueberries? Please check with your packer, processor or exporter when using Miravis^® Prime on berries destined for use outside of Canada.

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.

At time of print, Maximum Residue Limits (MRLs) had been established for the active ingredient pydiflumetofen for export markets in the United States. Please see the Bryant Christie Inc. Global MRL database for a complete list of MRLs. Should you need additional information on export market MRLs, please consult with Syngenta to receive the most up-to-date information.

Always read and follow label directions. Miravis^®, Inspire Super^®, Switch^® and the Syngenta logo are trademarks of a Syngenta Group Company. © 2022 Syngenta.