Dodder, Cuscuta spp.

Tangles of pale yellow or bright orange strings running amok over other plants may remind you of science fiction tales, but there are actually real plants that grow like this. The nearly leafless, stringlike stems of dodder can be seen occasionally on a wide variety of plants in different habitats. Learn more about the biology of these parasitic plants that depend on their host plants for nutrition in this article…

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Powdery Mildew

Are you seeing white? Not snow, but fluffy little spots on the leaves of your plants? This is most likely a plant disease called powdery mildew. Caused by a variety of different fungi, powdery mildew affects a number of vegetable, fruit and ornamental plants. Learn more about powdery mildew and what to do about it…

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Black Knot, Apiosporina morbosa

Unsightly dark-colored lumps on plum trees are not only unattractive, but if there are lots of them, they can disfigure or even kill small trees. These swollen growths are caused by a fungal pathogen that causes the disease known as black knot. To learn more about this disease and how to manage it, read this article…

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Aster Yellows

Instead of beautiful blossoms are your plants sporting weird flowers? Or maybe you’ve noticed yellow or twisted leaves, stunted growth, and/or bunchy growth not typical of the plant. These are all symptoms of aster yellows, a plant disease that affects hundreds of plants. To learn more about this devastating disease, read this article…

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Dog Vomit Slime Mold, Fuligo septica

A frothy yellow or orange blob appears overnight on your mulch pile or under wood chip-mulched shrubs. Aliens attacking? Fido upchucked its dinner? No, just the harmless slime mold Fuligo septica. To learn more about this common, but often disconcerting, fungus-like organism, read this article…

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Diagnosing Apple Problems During Fall Harvest Season

The fall apple harvest is coming in now, but not all the fruit may be perfect. If you have questions about what those spots, dimples and yucky spots are caused by, check out this article by the UWEX Fruit Team (entomologist Dan Mahr and plant pathologist Patty McManus).

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Turf Rust

Have your shoes turned orange when walking through your lawn? We had ideal conditions for the development of turf rust this year: warm days, heavy dews at night, and few mowings to remove the diseased blades. To learn more about this primarily cosmetic problem on turf grass, read this article…

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Entomophthora muscae

Have you ever noticed a dead fly hanging with outstretched wings from a flower stalk or glued to the window in your house? These insects likely succumbed to a fungus that only affects flies. This insect destroyer called Entomophthora muscae is actually fairly common, infecting several types of flies related to house flies. To learn more about this fungus, read this article…

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Cytospora Canker

Evergreen trees with dying or dead lower branches likely are affected by a disease called Cytospora canker. This fungal disease is particularly problematic on mature Colorado blue spruce trees, although many other types of spruce, pines, firs, and larch are susceptible. In addition to causing branch dieback, lesions form at the base of the branch, often with an excessive amount of resin. To learn more about this plant disease and how to deal with it, read this article…  info

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