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Fall is Prime Time to Manage Phytophthora in Almonds

October 2, 2019


This agronomic image shows almond tree roots treated with Ridomil Gold SL.  This agronomic image shows almond tree roots untreated.

More fibrous and longer roots with Ridomil Gold® SL fungicide (left) vs. untreated (right).

Everyone scouts for Phytophthora root rot in the spring, but this disease can sneak up on an almond grower at any time, including post-harvest. This issue tends to be more severe in areas with high water-retaining soils.

Here are 4 tips to optimize tree health through almond harvest and into winter:

  • Manage water usage. Do not allow water to stand around the crowns of trees. Install drainage in low spots of the orchard, areas that are prone to flooding and where water penetration is poor throughout the entire season.
  • Know the signs. Phytophthora symptoms include poor tree vigor, loss of top branches and gumming or bleeding around the tree trunk. Sometimes the tree’s surrounding soil can have a “rotten egg” smell. This smell is not caused by the disease, but it is caused by excessive soil moisture.
  • Take a soil sample. Syngenta offers the Soil Pathogen Assessment (SPA), a free program that allows you to test for Phytophthora infections. Contact your Syngenta representative to learn more about soil sampling through the SPA program.
  • Prepare with a fungicide application this fall. Ridomil Gold SL fungicide can protect against root rot and increase feeder root growth to ensure better water and nutrient use efficiency.

To learn whether Ridomil Gold SL is approved for use in your area, visit this page. For more information, talk to your Syngenta representative.

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