Black spots on tomato leaves are usually caused by fungal diseases like Septoria leaf spot or early blight, which thrive in warm, humid weather and can reduce yields or kill plants if untreated. Treat ...

A picture of leaves with leaf spot disease. - Boyloso/Shutterstock Have you noticed discolored spots or lesions on the leaves of your plants? This could be leaf spot disease, and it's wreaking havoc ...

Here's how to keep your hydrangea foliage looking green and healthy. In late summer or fall, Cercospora fungus causes brown spots on hydrangea leaves. The plant looks unsightly but usually recovers ...

A reader recently asked what the brown spots are on their rhubarb. Leaf spots are commonly found on rhubarb plants. This is more of an aesthetic problem and won't severely damage the plant. Rhubarb is ...

Gray leaf spot is a widespread fungal disease in corn, responsible for a 23-million-bushel yield loss in the U.S. in 2024. 1 The challenge with controlling gray leaf spot isn’t just deciding whether ...

Q: I have been battling a fungus on my grass all summer and I was curious if you could help me fight it. I have been told I have leaf spot disease on my St. Augustine grass. Can you help? A: Gray leaf ...

Are you dealing with Septoria brown spot in your soybean fields? You already know this and other common foliar fungal diseases wreak havoc on soybean crops, but you might not know how to start ...

Your photo and description indicate Septoria leaf spot, which is very common on Rudbeckia and is prevalent in Illinois. The disease begins on lower leaves and progresses up the plant but does not ...

Agronomist Ryan Gentle shares scouting tips and spray timing strategies to control tar spot, southern rust and other corn ...

Gray leaf spot is also active in the lower canopy at multiple sites across the state. The lesions are light tan in color and generally narrow and rectangular, and can be as long as 2 inches. As the ...

In late summer or fall, Cercospora fungus causes brown spots on hydrangea leaves. The plant looks unsightly but usually recovers from the disease. Drip irrigation, good air circulation, and removal of ...