Plant Healthcare

Chlorosis Chlorosis is a common nutritional disorder of many woody ornamentals in Wisconsin, particularly in the southern and eastern parts of the state.  Pin oaks are most commonly affected by chlorosis, although many other trees and shrubs (e.g., white oak, red maple, white pine, and Rhododendron spp.) are also very susceptible. What does it look like?  Symptoms of chlorosis are easy to distinguish from those of other diseases.  Affected leaves turn yellow, except for the veins, which remain green.  In severe cases, foliage may turn brown and die.  Symptoms can […]

A Simple Guide To Wasp Nests In Trees Maintaining the upkeep of healthy and functional plant life requires knowledge of the ins and outs of the insects that can build a home on your trees. Wasps often live in your gardens and can be seen among the tree branches. Knowing more about a wasp’s behavior can help you keep safe in your garden. For any homeowner who owns a garden with trees, keeping on top of the ecosystem is vital. When a nest is spotted, people will rush to call […]

Oak wilt is widespread in southern Wisconsin but in much of northern Wisconsin it is still a new and uncommon diseas Oak wilt kills thousands of trees each year in forests, woodlots and urban areas, or  can even attack and kill healthy trees. The disease is a particularly serious problem for species in the red oak group such as northern red, northern pin and black oaks. Once wilting symptoms are apparent on a red oak, the infected tree will lose most of its leaves and die within approximately one month. […]

MEET THE PEST The Japanese Beetle is coppery bronze and beautiful, but the mess it leaves behind, with its voracious appetite, it tears through foliage, flowers, and roots of more than 300 plant species. Both as adults and as grubs (the larval stage), Japanese beetles are destructive plant pests. Adults feed on the foliage and fruits of several hundred species of fruit trees, ornamental trees, shrubs, vines, and field and vegetable crops. Adults leave behind skeletonized leaves and large, irregular holes in leaves. PEST TYPE Chewing insect (Popillia japonica) ORIGIN & DISTRIBUTION […]

Bur Oak Blight Bur Oak Blight is a fungal disease that is relatively new to our area and that we should be aware of. The blight first appears in June as purple-brown spots on the underside of Bur Oak leaf veins. In July, the spots expand, and purplish necrotic veins become noticeable on the upper leaf surface. Leaf veins are killed as the infection progresses and a characteristic wedge-shaped necrotic area develops on the leaf blade. The trees have a scorched appearance with the disease typically worse on the bottom […]

The Japanese Beetle and the problems they cause? The Japanese beetle and the problems they cause:  is a highly destructive plant pest that can be very difficult and expensive to control. Feeding on grassroots, Japanese beetle grubs damage lawns, golf courses, and pastures. Japanese beetle adults attack the foliage, flowers, or fruits of more than 300 different ornamental and agricultural plants. Signs of Japanese Beetle Damage Japanese beetles feed on a wide variety of flowers and crops (the adult beetles attack more than 300 different kinds of plants), but in terms […]

Rhizosphaera Needle Cast What is Rhizosphaera needle cast? Rhizosphaera needle cast is the most common disease of Colorado blue spruce in Wisconsin. It makes Colorado blue spruce unsightly and unusable in many landscape settings. The disease can also affect other conifers including black, Engelmann, Serbian, Sitka, and white (e.g., Black Hills) spruce. What does look like? The first noticeable symptom of Rhizosphaera needle cast is browning and loss of the innermost needles on lower branches of spruce trees. Often, the youngest needles at the tips of branches remain healthy. Rows […]