Calling all tree enthusiasts, specialists, professionals

[pharmvet]

I posted earlier with this problem, but it has gotten worse and I would really like to get a definitive diagnosis of my problem. I have 32 white oak trees planted up the driveway of my future home. This is their second summer and they were doing really well until about July. They began to develop these lesions. Any ideas or suggestions? Is there a lab that would be able to perform testing, culture, or microscopic evaluation of the leves nd determine the cause?

 

[murphy1244]

I have a forestry guy coming tomorrow, I'll have him look at this for you.

 

[horsepuller]

I am no expert, but I googled "white oak leaves turn white". The first hit was:

Key to Diseases of Oaks in the Landscape | CAES Publications | UGA

Item number seven describes "powdery mildew", which looks like a possible fit.

Good luck. Hope someone more knowledgeable

 

[Western]

Mike, it looks like Powdery mildew to me also. You might benefit having your AG agent out to see it 1st hand.

Might try this as a long shot on a couple and see what happens. 1oz distilled vinegar mixed with 1 gallon of water, spray to cover top and bottom of leaves and rest of tree. This works on our roses by changing the pH on the plant, might work temporary for you.

 

[Rayster]

Can you call your closest Conservation Office? Those people are usually good about coming out to help diagnose and plan a course of action. The best part is your tax dollars pay for it. It's one of the few Govt. agencies that do what they say, and actually earn their money ( I like that ).

 

[steverino101]

probably powdery mildew as others have said. i have some plants with it and began treating it with a systemic fungicide spray this year. the best way to beat it is to spray pre-emptively
before and during leafage.

 

[farmer2009]

Mike, it looks like Powdery mildew to me also. You might benefit having your AG agent out to see it 1st hand.

My first thought and agree with seeing Ag Agent. Also, if you have a local NRCS office then sometimes they have a forester there. Looked like maybe some insect damage also although could be damage from the diseases. If so there is a product from Bayer that controls insects. You mix it up and pour it on the roots and the tree moves it to the leaves works well around here. TSC and Walmart both carry this product.

Good luck. Keep us updated.

 

[oldballs]

Are there any white oak of that species growing in your area? If so, are they doing okay? Maybe your plantings are suffering from too much attention i.e. watering, fertilizer etc. This is a guess from an amateur. Good luck with your work.

 

[forgeblast]

Gardens alive has a spray-able mildew treatment. I use it on my hops. Once the Japanese beetles come they damage the leaves enough and the Mildew starts.

 

[Jstpssng]

AgriLife Extension Service
Texas A&M Forest Service

These are two places in your state to start asking questions... they might as well earn your tax dollars.
If they can't point you in the right direction post again.