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Cody Molnar

SDSU Extension Horticulture Plant Pathology Field Specialist

605-688-4792

Berg Agricultural Hall 259
Box 2207D
Brookings, SD 57007

Cody supports the citizens of South Dakota as an SDSU Extension Horticulture Plant Pathology Field Specialist at the South Dakota State University campus in Brookings.

State & Regional Offices

SDSU Campus

Also by Cody Molnar

Horticulture research plot with rows of tarp-covered crops and living mulch between them.

Research Report: Warm-Season Living Mulch Impacts on Cucumber Yield and Disease Symptoms

A 2025 trial in Brookings, South Dakota aimed to detect the influences of various warm-season cover crop living mulches on pest pressure in tomatoes and cucumbers and the interactions between both grafted and nongrafted tomatoes and cucumbers and the living mulch.

External and internal ring rot symptoms on two potato samples.

Bacterial Ring Rot: Yet another devastating disease of potato

Ring rot is primarily a disease of stored tubers and seed potatoes, where it produces black or brown lines just below the surface of the potato.

Variety of pepper samples split open to reveal internal rot symptoms.

Pepper Internal Rot: Disease information and research updates

A new disease has been found in South Dakota pepper plants. While plants appear healthy and produce peppers that appear normal, many peppers will have a black mold growing inside. So, what’s going on with these plants?