Tobacco Mosaic

Tobacco mosaic causing a blotchy light and dark coloring (mosaic) of tobacco leaves. Tobacco mosaic causing a blotchy light and dark coloring (mosaic) of tobacco leaves.

Fungus Gnats on Houseplants

Fungus gnats (Family Sciaridae) are insects commonly associated with overwatered houseplants. They can become a nuisance when they are present in large numbers and fly around inside a home. In most situations, fungus gnats are a cosmetic problem. However, on occasion, fungus gnat larvae can cause plant damage.

Powdery Mildew – Herbaceous Ornamental

Powdery Mildew – Herbaceous Ornamental Authors: Brian Hudelson, UW-Madison Plant Pathology Last Revised: 02/18/2010 X-number: XHT1005c What is powdery mildew? Powdery mildew is a disease that occurs on the above-ground parts (especially the leaves) of many herbaceous ornamental plants, as well as deciduous trees and shrubs, indoor houseplants, and many agricultural crops. Conifers are not […]

Japanese Beetle

The Japanese beetle, Popillia japonica, is a significant pest of landscape trees and shrubs, vegetable and fruit crops, and turfgrass in the eastern United States. This factsheet describes the lifecycle of this destructive beetle along with management and control options.

Insect Pest Management for Greenhouses

This handy chart lists pesticides that are most effective against common greenhouse pests such as aphids, scales, leafminers, spider mites, and thrips. Formulation, effectiveness, cautions, and other details are provided.

Rabbit Ecology and Damage Management

This publication describes the lives, habits, and habitat of the eastern cottontail rabbit and snowshoe hare, both natives of Wisconsin. These creatures consume lots of different kinds of food, including garden vegetables and flowers in spring and summer, and bark of woody plants in fall and winter—which is why they are not welcome guests in everyone’s back yard.

Gladiolus Disorder: Virus Complex and Aster Yellows

Viruses can destroy the value of a gladiolus crop. Serious infections have been observed throughout Wisconsin in some years. While Aster Yellows is common, it usually infects just a few gladioli scattered in plantings. This fact sheet covers the symptoms, causes, and means of control of viral and Aster Yellows infection.

Hosta Virus X

Hosta virus X (HVX) is a viral disease that causes serious problems on many hosta cultivars, causing nursery owners and gardeners in the United States to voluntarily destroy large numbers of hosta to help prevent the spread. This fact sheet describes the symptoms and management of this virus.

Root-Knot Nematode

Root-knot nematodes (Meloidogyne spp.) are small, soilborne, worm-like organisms that infect many agricultural and horticultural plants. This publication describes the symptoms, management and control of root-knot nematodes in Wisconsin.

Foliar Nematodes

Foliar nematodes are microscopic worm-like organisms in the genus Aphelenchoides. They live in and on the leaves (and other above-ground plants parts) of over 450 plant species in more than 75 plant families. They are commonly found on hostas, but can affect other herbaceous ornamentals. Learn what to look for and how to manage foliar nematodes in this factsheet.

Iris Borer

Iris borer is the most serious pest of iris in Wisconsin. Iris plants attacked by iris borer will discolor, wilt, and die during late June and July. On close examination of affected plants, a pinkish-white caterpillar can be found feeding on the inside of rhizomes. This factsheet covers identification and control of this serious pest.

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