Dear Neil: One of my five oak trees is having this problem and I’m wondering what I should do. I hope it’s not a disease that could spread to my other trees. Thanks for any advice you can give me.
A: I would begin by calling for the help of a certified arborist. That’s a skilled and licensed tree service specialist who is a member of the International Society of Arboriculture. He or she will be able to examine the tree closely and determine whether this is Hypoxylon canker or some other fungus within the wood of the trunk. I will tell you that the signs are ominous because the bark is separating down the main trunk and up both forks/branches. This darker internal wood is probably moist from decay. As totally involved as it is, there is a very good chance that this tree cannot be saved. However, it would be much better to let the professional arborist examine the tree in person, take samples for culturing (perhaps at the Texas A&M Plant Disease Diagnostic Lab in College Station), and develop the best plan for you. Often trees with decaying wood in their trunks are beginning to lose strength. They can come tumbling down without warning. I would contact the certified arborist immediately. I’m sorry for the nature of my reply.
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Dear Neil: What weedkiller do I use to control this weed? When do I apply it? Do I use a pre-emergent type or a spray?
A: Your sample is of roadside aster, and many people are asking about it right now. You’ll see it showing up where you’ve had the hardest time getting water and fertilizer to your lawn this growing season. The remedy long-term is to take the best possible care of your turf. This weed disappears when turfgrass is kept vigorous. You could apply a Gallery pre-emergent product in mid-March and again in mid-June, or you could apply a 2,4-D broadleafed weedkiller spray as you begin to see its wispy little stems…