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Pocahontas, Illinois | Growing 70 acres of Christmas Trees in Southern IL. We spray fungicides on them, but mainly in the spring. It very much depends on what species of tree and what disease you have. Scotch pine get diplodia fungus and can have severe damage. Spray with Bravo (Chlorthalonil) and Tilt (Propiconazole) in a tank mix at bud break then every 7-10 days after until weather and temperature limit the disease. We sprayed 3 coats over about 40 days this spring. Spruce trees suffer from Rhizosphaera needlecast most likely. This is where the inner needles of the bottom branches turn purple and then fall off. It eventually defoliates the bottom of the tree and will weaken and kill the tree. We spray Thiophanate-methyl (T-methyl) on the same timing as the chems listed above. 3 coats of this this spring over the same 40 days. Wetter springs mean more trips while a dry spring may only require 1-2 trips. Douglas Fir get Swiss needlecast and/or Rhabdocline needlecast. Both the treatments listed above will work on that. If you have White Pine, you probably don't have a fungus problem. A mist blower works best but a hand gun will work if only doing a few trees. Get full coverage over the entire tree and be sure to get it into the interior needles of the tree. There are some needlecast fungi that are sprayed in the late summer, but they are much less common. | |
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Spraying evergreens trees ?
