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greenmonster304
07-28-2011, 08:54 PM
I all I am usually on the irrigation forum but I have a question for you pesticide guys. I have a very wealthy customer that has about 30 black pines that one her driveway. A number of them have been attacked by the turpentine beetle. She hired a local tree specialist who said he could save the trees. Part of his treatment of the trees was having me install drip irrigation on all the trees even the established ones. He instructed me to run the drip one hour every day even though the trees are in the lawn and get alot of water from the sprinklers. Have any of you heard of this approach? I believe it is harming the trees by having too much water.
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Think Green
07-28-2011, 11:52 PM
First off make sure it is the turpentine beetle.......there should be some exit tubes...colored red from sap fungus.
If so, these insects feed on the phloem of the tree and not the xylem. Phloem feeding insects are harder to control as most OTC products cannot penetrate the bark and absorb into the phloem. Most products are only xylem active. Most times the beetle attacks the weak and stressed trees first, so this leads me to speculate the reason for the drip irrigation. ( This is supposed to increase tree vigor and nothing more)
Maintaining proper soil nutrient status through an acidic needle or pine bark mulch over the root zone, and by not routinely watering turf grasses beneath pines is a basic approach to natural control. Grass competition under these trees only weakens the tree and speeds up attack. As far as too much water..................I agree with you!!

Think Green
07-28-2011, 11:56 PM
Last year, I went to a customers home who had a single black pine growing in the middle of a Zoysia lawn. The tree was in severe decline and browning out each day. You could stand next to the tree and hear chewing--knocking noises--or what sounded like Mexican jumping beans under the bark. Needless to say----the tree is no longer alive!!!
Storm damage, environmental stresses and competition makes trees target for attack of disease, fungus and insect attacks. We take away the natural organic material from under trees......................what else can the tree live on!!???