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.

Amaryllis, Hippeastrum

Amaryllis bulbs make wonderful holiday gifts and are a welcome sight during a long cold winter with their large, colorful long-lasting flowers. If you can provide the right conditions, it’s not hard to maintain the plants after flowering in order to get them to rebloom the following year. To learn more about these bulbs, read this article…


Colorful flowers are always welcome indoors in the winter. Cyclamen persicum is a tender plant that is grown as a houseplant for its bright white, pink or red flowers that can bloom for months.  It may be difficult to provide the right conditions to get this plant to rebloom, however. To learn more about what cyclamen needs to thrive, read this article…

Pink Rain Lily, Zephyranthes grandiflora

If you want to grow something a little different, with grassy foliage and relatively large flowers, consider pink rain lily. This tender bulb gets its common name from the color of the flowers that burst into bloom after a good rain. Easy to grow in containers, it makes a good summer patio plant or a year-round houseplant. Learn more in this article…

Root Rots on Houseplants

Brian Hudelson, UW-Madison Plant Pathology and Laura Jull, UW-Horticulture Revised:  4/25/2004 Item number:  XHT1071 What is root rot?  Root rot is a general term that describes any disease where the pathogen (causal organism) causes the deterioration of a plant’s root system.  Most plants are susceptible to root rots, including both woody and herbaceous ornamentals.  Root […]


Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  2/17/2012 Item number:  XHT1116 What is edema?  Edema (or oedema) is a physiological disorder that frequently occurs in houseplants, greenhouse plants, and other plants sheltered under plastic.  This disorder also affects field-grown vegetable crops under certain environmental conditions.  Edema is often a cosmetic problem, but in […]


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 […]


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 […]


Amy Gibbs* and Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1035 What are orchids?  Orchids belong to the orchid family (Orchidaceae) and are exotic plants grown for their beautiful, showy, and long lasting flowers.  Although most species of orchids are epiphytic (i.e., naturally grow on trees or other plants), some grow on rocks […]

Houseplant Care

Amy Gibbs* and Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1033 Where do I put my houseplant in my home?  Two of the most important factors in placing a houseplant in your home are light and temperature.  Know both the light requirements of your plant and the sources of light in your home […]

Gray Mold (Botrytis Blight)

Jeffory Schraufnagel*, Milwaukee Area Technical College, Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1122 What is gray mold?  Gray mold (or Botrytis blight) is a common and often serious fungal disease that can affect plants of all kinds.  Gray mold is a particularly serious problem on flowering plants and those plants grown in […]


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, […]

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