Pest Alert Authors: PJ Liesch and R. Chris Williamson, UW Entomology Last Revised: 04/07/2022 X-number: XHT1181 Emerald ash borer insecticide treatment considerations. Several insecticide products are available to homeowners for control of emerald ash borer (EAB). Since the presence and infestation level of EAB is quite difficult to determine at early stages of an infestation, insecticide treatments may […]
Brian Hudelson, UW-Madison Plant Pathology, UW-Extension Revised: 1/8/2012 Item number: XHT1002 What is 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, […]
Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised: 8/13/2012 Item number: XHT1096 Recently, several commonly-used insecticides for the control of insects on woody landscape plants have been taken off the market. As a result, it’s becoming ever more challenging for home gardeners to find suitable insecticide products at garden centers, discount stores, and hardware stores. […]
Laura G. Jull Revised: 8/13/2012 Item number: A3825 If you’re thinking about planting lilacs, here’s some timely help! UW-Extension’s Lilacs for Cold Climates describes the best of the top-rated cold-weather cultivars. These are the gems that will survive when winter temperatures tumble below zero. Every page dazzles with bouquets of blooms. Lilacs for Cold Climates […]
Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised: 8/6/2012 Item number: XHT1086 Indicator plants are not always suitable for the timing of pest management practices. You may not have the critical indicator plant nearby to time local activities, or there may not be a good indicator plant for a particular pest’s crucial life stage. Another […]
Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised: 8/13/2012 Item number: XHT1088 Ash Borer 1st instar larvae = 275-500 DD50 Ash Plantbug Nymphs = 100-200 DD50 Birch Leafminer 1st generation larvae = 275-500 DD50 Black Vine Weevil 1st generation adults = 400-600 DD50 2nd generation adults = 900-1000 DD50 Bronze Birch Borer Larvae = 400-500 […]
Author(s): M.F. Heimann, G.L. Worf Scorch, or the browning of leaf edges, affects a wide range of deciduous and evergreen plants throughout Wisconsin, especially ash, linden, maple, oak, pine, and spruce. While scorch is easily recognizable, it’s important to recognize that it is a symptom, not a cause. A number of problems cause symptoms that […]
Learn about this disease of oaks, the life cycle and management options.
Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised: 5/17/2012 Item number: XHT1085 The word phenology is derived from the Greek word phaino meaning “to show” or “to appear”. Phenology is a branch of science that studies the relationships between periodic biological events—usually the life cycles of plants and animals—and environmental changes. Natural events such as […]
Brian Hudelson, UW-Madison Plant Pathology Revised: 8/13/2012 Item number: XHT1005a What is powdery mildew? Powdery mildew is a disease that occurs on the above-ground parts (especially the leaves) of many deciduous trees and shrubs, as well as herbaceous ornamental plants, indoor houseplants, and many agricultural crops. Conifers are not affected by this disease. What does […]
Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised: 8/13/2012 Item number: XHT1130 Scales are probably one of the most difficult insects to control because of their protective covering. There are many species of scales, but they can all be categorized as either soft or armored. Soft scales are tropical insects and are economically more […]
Author(s): M.F. Heimann, G.L. Worf Springtime weather injury can cause misleading symptoms on foliage. This fact sheet describes symptoms and steps to minimize the likelihood of injury (2 pages). Click on this link to view the PDF of this fact sheet.