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Grumblings about Imprelis
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Taken from the P.E.S.T. (Pest Evaluation and Suppressiona Techniques) Newsletter
Dr. David Shetlar (OSU Plant Entomolgist) in partnership with Ohio Nursery & Landscape Association |
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| I hate to spread rumors and talk about pesticide issues before the parent company has issued any official responses, but I received several pictures of spruce trees last week that looked like they had been torched by some chemical. Interestingly, just before the images arrived, the ENLT-Team has just discussed a potential issue with the new, low toxicity, broadleaf herbicide, Imprelis. Our turf agronomist has pointed out that this is the first broadleaf herbicide that can be applied by anybody as a granule and achieve extremely good control. Because of the low toxicity and impressive range of control, many lawn care companies decided to adopt the product for use this spring. Being a pricey product, it has been used primarily on high end lawns and grounds. |
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| When the hot weather arrived, folks suddenly noticed that spruces (mainly Norway spruce, but I have images of Colorado spruce and white pine damage) had their needles turning brown and new candles (shoots) twisting and curling to the ground. The Imprelis label states to avoid applying under the drip line of trees, but there is some evidence that damage may be occurring to trees where Imprelis was not applied under the drip line. In any case, I’m putting this in to avoid being inundated with more images of spruces and white pines turning brown. The only thing that should turn these trees brown would be white pine weevil larvae, and the damage would only occur at the tops of trees, not overall on the new needles. Stay turned! I’m afraid that this is going to be a BIG issue this summer. |
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