Jacobs Tree Surgery Inc

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New This Week To receive an email each time we add an article to the "New this week" section, please click the link below and send us your email address... Subscribe Here October 3, 2010 - Bacterial Leaf Scorch Update – Real Cases You do not necessarily need to cut down your oak tree if you find out that it has bacterial leaf scorch. Yes, BLS is incurable. But hey – so is diabetes. If you find out you have diabetes are you going to go right to Dr. Kevorkian? Of course not! Your doctor is going to tell you how to manage the disease. And if you follow his advice you probably have a lot of good years left! Here are some trees I ’ve been watching for a while. All the photos were taken late in the growing season when the symptoms look the worst. Red oak, Paoli, tested positive 2007 and below Photo, Sept. 2010 This tree has some problems besides the BLS – old root and other injuries. But the owner wants to keep it as long as possible. It is not declining quickly. Row of red oaks, Valley Forge, photo Oct. 2010 These trees are healthy. Do you see the gap in the treeline where the man is standing? There was another oak tree there until 3 years ago. It tested positive for BLS in 1992. Before that, it was injured when the adjacent driveway was bulldozed. Its health never recovered. It stood diseased and declining for many years. The trees right next to it were never affected although the spittlebugs and leafhoppers that can transmit the disease were surely present. Pin oak, Collegeville, photo Oct. 2010 This pin oak tested positive for BLS in 2003. At that time, it was treated by trunk injection and prescription fertilizing to treat chlorosis (chlorophyll deficiency) NO antibiotics. It looks like it is due for treatment again – see the yellow leaves? But it ’s hanging in there, not declining, no tip dieback. Pin oak near Norristown, Oct. 2010 This tree tested positive for BLS in 1997. It was treated with antibiotics and prescription fertilizer. It had significant decline symptoms at that time, including tip dieback. It has not been treated since, except for routine crown cleaning pruning. It looks better than it did 13 years ago. The owner is glad she kept it. Pin oak in Royersford This tree tested positive for BLS just last year. The tree is full of sprouts because of bad pruning. It is chlorotic because of soil chemistry. This summer when the scorch symptoms appeared again the owner decided to invest in the treatments I suggested could improve its health. We mulched as much of the root zone as he was willing to sacrifice from lawn area, to help preserve soil moisture. This fall we will treat the soil with a prescription fertilizer treatment as per Penn State soil test results, along with a biostimulant. Next spring I ’ll evaluate leaf color and, perhaps, inject with micronutrient (iron) to treat chlorosis. I will keep you posted next year with results! What will happen to our oak trees in the future as a result of this disease? Nobody really knows. Here are some of the possibilities: Some predict doom and gloom – a big percentage of red oak group trees will be killed. Maybe, but I doubt it.

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