Bacterial blight of geranium is the single most important disease of geraniums.
Informational table showing disease name, symptoms, pathogen/cause, and management of Aster diseases.
Informational table showing disease name, symptoms, pathogen/cause, and management of African Violet diseases.
Viruses are submicroscopic entities capable of causing disease. They are a piece of nucleic acid (genetic material) surrounded by a protein coat. Once inside the plant cell, the nucleic acid portion directs the plant cel
Tree Diseases that Create Hazards
Most plant diseases cause a loss of yield or damage the aesthetic qualities of the infected plant. Certain diseases of trees, however, weaken their structure and create a hazardous situation where property damage or seri
Tobacco mosaic virus (TMV) is named for one of the first plants in which it was found in the 1800s. However, it can infect well over 350 different species of plants.
Sources Of Plant Disease In Nurseries
Where do diseases begin? The nursery manager who can answer this question is in an excellent position to minimize losses caused by plant pathogens by reducing or eliminating the numbers of pathogens a
Sources Of Plant Disease In Greenhouses
Where do diseases begin? The greenhouse manager who can answer this question is in an excellent position to prevent losses due to plant pathogens by reducing or eliminating the numbers of pathogens at
The pathogenic fungus, Rhizoctonia, is known to cause root rots, stem rots, damping-off and, in some cases, a blight of leaves. It is a soil-borne fungus favored by warm, moderately moist soil conditions. Cross-wall nea
References For Floricultural Crop Diseases
It is very helpful to know where information can be obtained to diagnose and learn more about plant diseases.
While root rot can be caused by several different species of the fungus-like organism Pythium, the most commonly encountered species in the northeastern U. S. are Pythium irregulare, Pythium aphanidermatum, Pythium crypt
Pseudomonas syringae: A common pathogen on woody plants
The bacterium Pseudomonas syringae, is an opportunistic pathogen that can attack a wide variety of woody plants especially when they are damaged by frost or injured in some way.
Powdery mildew occurs on many different flowers, woody ornamentals and trees including roses, snapdragons, African violets, kalanchöe, English ivy, zinnias, photinia, oak, lilac, and begonias. Powdery mildew on Poi
Plant injury (phytotoxicity) may occur when chemicals are employed to protect plants from pests, fertilize plants, regulate plant growth, etc. Phytotoxicity can occur when:a material is properly applied directly to the p
Over-Fertilization of Potted Plants
Over-fertilization of commercial pot or container-grown crops results in high concentrations of soluble salts in the potting medium.
Key Plants and Key Diseases Outdoors
Selecting plants for placement in the landscape as well as monitoring them for diseases and planning appropriate disease management strategies can be simplified if the key plants in the landscape are
Key Plants And Key Diseases Indoors
Selecting plants for placement in the interiorscape as well as monitoring them for diseases and planning appropriate disease management strategies can be simplified if the key plants used in the inter
Two closely related viruses, Impatiens Necrotic Spot (INSV), and Tomato Spotted Wilt Virus (TSWV), once called the I-strain and L-strain of tomato spotted wilt, have been widespread and devastating in the greenhouse indu
While most nematodes are soil-dwelling, the foliar nematode Aphelenchoides lives only briefly in soil. More importantly, it lives on the above-ground portions of plants, often without causing any obvious symptoms. Piggy
Downy mildew is the common name for a group of highly specialized obligate parasites of vascular plants. These organisms are distinctly different from the powdery mildews. Although they have traditionally been included t
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