Volunteer Peanuts and Leaf Spot Inoculum Dan Anco Clemson Peanut Notes No. 85 2023

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The following is a post from Dan Anco at Clemson University
In a field where peanut was grown last year and where there were areas with heavy defoliation from late leaf spot (>90%), a few volunteers are now starting to show their first LLS lesions. Late leaf spot is most readily distinguished from other lesions that could be caused by surfactant burn, herbicide, or physiological responses by the presence of bumpy conidiophores on the underside of the late leaf spot lesion. A hand lens makes this easier to see. Scouting fields is a great way to help spot potential issue areas early.
This helps highlight the importance of effective management of volunteer peanut, whether they are in a field nearby to where peanut is planted this year, or in one that may not have peanut planted in it for several years, in helping to reduce background inoculum of the fungus that survives and spreads from year to year. Liberty is highly effective in killing (volunteer) peanut. If volunteer peanut are in a nearby field, we can consider including a 30-day fungicide application such as chlorothalonil to help with early season protection.
Image of spores:

Dan Anco

Extension Peanut Specialist and Associate Professor

Department of Plant and Environmental Sciences

Clemson University – Edisto Research and Education Center

64 Research Road

Blackville, SC 29817

630-207-4926 cell


Clemson Extension – Peanuts