Early Blight & Brown Leaf Spot
Early blight (caused by Alternaria solani) is a common problem in southern Idaho.
This disease can destroy leaves and cause tuber blemishes after harvest. Varieties differ in susceptibility to this disease. Additionally, plant fertility is an important component to reducing the severity of disease.
Many fungicides are available which can help suppress disease to manageable levels. A related disease called brown leaf spot (caused by Alternaria alternata and other small-spored Alternaria species) can also be problematic on potatoes, but this is not as aggressive as early blight.
Resources & Downloads
Use of SDHI Fungicides for Managing Early Blight and White Mold
Presented at the 2019 Idaho Potato Conference
Strobilurins for Early Blight Control in Potato
Strobilurins for Early Blight Control in Potato When Quadris was introduced for managing foliar diseases of potatoes in 1998, growers' ability to control early blight increased dramatically. Other strobilurin products have followed.