Black Stem Borer

Black stem borer (BSB), also known as the alnus ambrosia beetle, is an invasive beetle from Asia that was accidentally introduced into central Europe and North America. BSB has traditionally been considered a serious pest of nursery and landscape trees, but has also been reported as a pest of fruit crops. This factsheet describes the appearance, life cycle, scouting suggestions and control methods of this important pest.

Twospotted Spider Mite, Tetranychus urticae

From apples to zucchini – no matter what types of plants you grow – it’s likely something spider mites will attack. The most common spider mite, the twospotted spider mite (Tetranychus urticae), is a general feeder that attacks a wide variety of fruits, vegetables, and ornamentals. Learn about this the biology of this tiny pest, the type of damage it causes and how to manage it in this article…

Plum Curculio

Plum curculio, a beetle native to the midwestern United States, is one of the most common and detrimental pests of apple in Wisconsin and can cause significant damage to tree fruit. Along with apple, it attacks pear, quince, and stone fruits such as plum, cherry, peach, and apricot. Learn about the life cycle, damage patterns, and control options to effectively manage plum curculio.

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…

Kiwifruit, Actinidia spp.

What’s brown and fuzzy all over and green inside? Well, the kiwifruit, of course. This Chinese fruit was popularized when it was imported into New Zealand, renamed kiwifruit instead of Chinese gooseberry, and developed as an export crop. Today this fruit crop is grown in many places worldwide, but there is more than just the kind found at the grocery store. To learn more about kiwifruit, read 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…

African Fig Fly – Pest Alert

Pest Alert Authors: Janet van Zoeren and Christelle Guédot, UW-Madison Entomology Last Revised: 04/17/2019 X-number: XHT1267 The African fig fly (AFF), Zaprionus indianus, is an invasive vinegar fly closely related to flies in the genus Drosophila [which includes the common vinegar fly (also sometimes called the common fruit fly) and spotted-wing drosophila (SWD)]. AFF is […]

San José Scale

This factsheet describes the symptoms, life cycle, monitoring methods and control of San José scale (Diaspidiotus perniciosus). This fruit tree pest can be found in most fruit growing regions of the United States. In well-managed orchards, populations of San José scale are generally too low to cause economic damage. In poorly managed orchards however, San José scale can get established and be difficult and expensive to control.

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.

Serviceberry, Amelanchier spp.

If you’re looking for a small tree with attractive white blossoms in spring and small fruits that can be food for animals or humans, consider one of several species of serviceberry. There are a number of plants in the genus Amalanchier that are graceful trees or shrubs that can provide year-round ornamental interest in the landscape. To learn more, read this article…

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…

Eastern Filbert Blight

Eastern filbert blight is a potentially serious fungal disease found throughout the United States, including Wisconsin. It affects Corylus species, commonly known as hazelnuts or filberts, causing cankers on branches and trunks. Symptoms and management are described in this factsheet.

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