Brian Hudelson, UW-Madison Plant Pathology Revised:  3/10/2012 Item number:  XHT1001 What is anthracnose?  Anthracnose is the name of several common fungal diseases that affect the foliage of woody ornamentals in Wisconsin.  Trees that are most commonly and severely affected by anthracnose include ash, maple, white oak, sycamore, and walnut.  Anthracnose typically affects young leaf tissue. […]

Black Knot

Brian Hudelson, UW-Madison Plant Pathology, UW-Extension Revised:  5/1/2010 Item number:  XHT1056 What is black knot?  Black knot is a disfiguring and potentially lethal disease of trees and shrubs in the genus Prunus.  This genus includes stone fruits such as wild, fruit-bearing and ornamental plums and cherries. What does black knot look like?  During the first […]

Hardiness Maps

Some plants can survive colder winter temperatures than others. Zone of cold hardiness refers to the plant’s ability to survive the winter. It plays a key factor in selecting landscape plants for the region. USDA has classified the entire United States into 13 plant hardiness zones based on their average, annual minimum temperature during 30 […]

The Basics of Micro Irrigation

Micro irrigation has numerous advantages over sprinkler irrigation and can be used in greenhouses, orchards, vineyards, fields, lawns, and gardens. Learn about the components that comprise a micro irrigation system along with the benefits (reduced water usage, reduced potential for foliar diseases, reduced energy costs, etc.) and drawbacks these lower pressure systems provide.

Spotted Tentiform Leafminer, Phyllonorycter blancardella

Have you had people ask what those funny stippled blotches on their apple tree leaves are? When held up to the light, the spotted nature of these mines become apparent, and are a diagnostic feature of the damage caused by the spotted tentiform leafminer. If you want to learn more about this insect pest, read this article…

White-lined Sphinx Moth, Hyles lineata

The white-lined sphinx is a common moth that occurs throughout most of North America. The adult is a fairly distinctive heavy-bodied moth with triangular wings, but you may not recognize the caterpillar as the same insect. With a wide host range and considerable variation in color, it may not be quite as easy to identify. To learn more about this charismatic moth – and its immature stage that just might be living in your garden – read this article…

Mighty Mites

Did you know that there are mites that eat other mites? Barely visible to the naked eye, these little predators help keep spider mites and other pests in check. Read on to learn more about this fascinating world of tiny predatory mites…

Split-leaf philodendron, Monstera deliciosa

It’s a tropical plant native to rainforests of Central America that is often grown as a foliage houseplant. With big holes in its leaves, it’s aptly called Swiss cheese plant, but is more commonly known as split-leaf philodendron. Did you know it also has edible fruits? Learn more about Monstera deliciosa in this article…

Apple Maggot: Scourge of Home Apple Production

If you have an apple tree in your backyard, you’ve probably found out that apple maggot likes your fruit as much as you do. Learn from UW-Extension Fruit Entomologist Dan Mahr more about this pesky fly and what to do about it in this article…

Eastern Tent Caterpillar, Malacosoma americanum

White tent-like masses in the forks of tree limbs in early spring are the silken nests of the eastern tent caterpillar, a native insect that develops on fruit and hardwood trees. It is often confused with the fall webworm, which also creates silken nests. To learn more about this pest and how to deal with it, read this article…

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