White Spots on Leafs - Knowledgebase Question

Whitmore Lake, Mi
Avatar for jimmbaker
Question by jimmbaker
July 2, 2010
What must I do for white spots on cucumber plants.

Answer from NGA
July 2, 2010
The white spots can be sunburn or might be powdery mildew, a fungal disease. If the white is a coating on the leaves, cut away the infecting leaves so the disease doesn't spread to the rest of your plant. To reduce additional infections, avoid overhead watering to help reduce the relative humidity. Remove and destroy all infected plant parts (leaves, etc.). Selectively prune overcrowded plant material to help increase air circulation. This helps reduce relative humidity and infection. If cultural controls fail to prevent disease buildup, or if the disease pressure is too great, an application of a fungicide may be necessary. These include: sulfur, neem oil (Rose Defense, Shield-All, Triact), triforine (Ortho Funginex), or potassium bicarbonate (Kaligreen, First Step) Chemicals are most effective when combined with cultural controls.

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

( No account? Join now! )

Today's site banner is by Visual_Botanics and is called "Hidden Bird Bath"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.