Home > Uncategorized > Gray Leaf Spot is on the Move!

Gray Leaf Spot is on the Move!

In the past week I’ve gotten six different samples that were positive for gray leaf spot from Mass, CT, RI and Long Island.  In at least half of those cases, strobilurins have been used to try and control the disease and failed.   This is not unexpected, gray leaf spot frequently develops resistance to these fungicides (Compass, Heritage, Insignia and Disarm).  The best approach is to tankmix chlorothalonil with a DMI.  High humidity, rain and warm temperatures will drive the disease. It will slow a bit when things cool down and dry out.

Categories: Uncategorized
  1. No comments yet.
  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: