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This diseases and disorders chapter from the Extension Gardener Handbook discusses how to keep plants healthy through cultural practices. The types of plant pathogens including: fungi, bacteria, nematodes, viruses, and parasitic plants are discussed. Strategies are reviewed for managing diseases using an integrated pest management approach.
This factsheet offers information on damping off in flower and vegetable seedlings, a result of fungi present in the growing medium.
This Entomology Insect Note describes the biology and control of sooty molds, fungi that grow microscopic threads that form easily visible black spots on many plants.
This insect note describes how to identify and control powderpost beetles and wood-attacking fungi.
Black root rot impacts a range of woody and herbaceous ornamental plant species primarily in greenhouse ornamental plant production, but also in home and commercial landscapes and nurseries. This disease causes decay of the root system and leads to yellowing, wilting, and necrosis of foliage. It is widely distributed and has been described on approximately 30 plant families in many parts of the world. Some of the most frequently impacted ornamentals are pansy, viola, Calibrachoa, annual vinca (periwinkle), Salvia, petunia, Persian cyclamen, snapdragon, Begonia, Verbena, Phlox, and Gerbera daisy. In addition to ornamental plants, some vegetable and other agricultural crops are also susceptible to infection.
This appendix from the Extension Gardener Handbook includes tables to help gardeners identify common problems and management strategies for fruits, vegetables, and ornamental plants.
