Degree Day Calculation

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 […]

Phenology

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 […]

Ips Bark Beetle

Ips bark beetle, also known as the pine engraver, is an insect that attacks and kills weak, stressed, declining and dying pine and spruce trees. These insects are attracted to trees that have been stressed from drought, construction damage, overcrowding, transplant shock, flooding, disease and other insect problems. Identification and management are covered in this fact sheet.

Scale Insects

Scale insects feed on many plants, but are often overlooked because they are immobile and many types look like small bumps that just might be plant parts blending in with the leaves, twigs and branches. These insects secrete a waxy covering – that gives them their common name – to protect them from the environment and predators. Learn more about this group of inconspicuous and atypical insects in this article…

Aphids, in-depth

Aphids may be viewed as just another pest for gardeners to try to eliminate, but they’re really fascinating insects, with bizarre lifestyles and eating habits and they’re also dinner for lots of other insects. Forming colonies covering the leaves and stems of plants, these small sap-sucking creatures reproduce incredibly fast and a few also transmit plant diseases. Learn more about this large group of insects and how to manage them in the garden in this article…

Aphids

Aphids are soft-bodied, sucking insects that are sometimes called plant lice. They feed on plant sap and subsequently excrete a sugary substance (called honeydew) that can attract ants as well as support the growth of a saprophytic fungus called sooty mold. Learn about common aphids found in home gardens in this factsheet.

Sawflies

Sawflies are a group insects related to wasps that get their common name from the saw-like appearance of the ovipositor, which females use to cut slits in stems or leaves to lay their eggs. The plant-feeding larvae often look like caterpillars or slugs, and many are quite noticeable because they often stay together to feed in groups and quickly cause noticeable defoliation on their hosts. Learn more about sawflies in this article…

European Pine Sawfly, Neodiprion sertifer

If you’ve noticed masses or writhing, dark green “caterpillars” on your pine trees this spring, you likely have an infestation of European pine sawfly. This insect lives in large colonies, feeding on last year’s needles until they finish their development, then pupate in the soil or leaf litter. To learn more about this pest, read this article…

Woody Ornamentals Pest Management in Wisconsin

Author(s): Chris Williamson, P.J. Liesch, Jim Kerns, Roger Flashinski Woody Ornamentals Pest Management in Wisconsin is an indispensable resource for nursery growers. This completely revised publication identifies pests of trees and shrubs in the state plus the products available for their control. It also notes products that are registered for use by homeowners (56 pages; […]

White Grubs on Christmas Trees

P.J. Liesch and R. Chris Williamson, UW-Entomology Revised:  5/20/2013 Item number:  XHT1208 White grubs (i.e., larvae) of the common May/June beetle or “Junebug” (Phyllophaga spp.) are an important pest of Christmas trees in Wisconsin.  This soil-dwelling pest feeds on the roots of pines, firs, and spruces, and can cause damage severe enough to kill small […]

Mealybugs

Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised:  4/26/2004 Item number:  XHT1129 Mealybugs are slow-moving, small, oval insects that are covered with a white, cottony wax.  They are tropical insects that are typically only found on perennial foliage plants, and rarely on flowering or bedding plants.  They can infest all plant parts including the […]

Western Conifer Seed Bug

Phil Pellitteri, UW Insect Diagnostic Lab Revised:  4/27/2004 Item number:  XHT1052 Western conifer seed bugs belong to the leaf-footed bug family Coreiidae.  Adults are 3∕4 of an inch long, elongate, reddish to dull brown with a faint, white zigzag straight line across the center of the wings.  They have long, thin antennae and hind legs […]

Support Extension