Options for Sclerotinia Blight Management

— Written By Barbara Shew

Sclerotinia has been very active this summer due to several spells of cool wet weather, with more to come. We are receiving reports that Omega is in short supply. Options to consider include:

Endura at 8-10 oz/a is effective against Sclerotinia blight. In our trials, Endura has performed as well as the 1.5 pt/a rate of Omega. It does not persist quite as long as Omega, lasting 14-21 days vs. 21-28 days for Omega. Endura also may be difficult to find.

Reduced rate of Omega. For less challenging situations, you can stretch your Omega supply by using 1 pt/a instead of 1.5 pt. There is a noticeable decrease in control at this lower rate under high disease pressure.

High rate of Fontelis. Fontelis applied at 1.5 pt/ a will give statistically the same control as 1 pt/a Omega but practically the control may not be quite as good. Fontelis will provide leaf spot and stem rot control in addition to controlling Sclerotinia blight. We don’t have the data yet, but I suspect that reapplication in 2 weeks will give the best control.

Higher volume applications (20 gal/a) are ideal for Sclerotinia control, but coverage also is very important. Many infections start on or spread to leaves and to areas of the stem away from the crown. Use hollow cone nozzles for best coverage.

Bravo will aggravate Sclerotinia problems. Avoid applying Bravo alone or in mixture when Sclerotinia blight is active.

Article first appeared as North Carolina Peanut Note (PNNC-2014-118)