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DISEASES

It is important to identify and be familiar with the diseases that frequent greenhouse environments. Diseases need three components 'the disease triangle' in order to develop: the presence of the disease pathogen, a suceptible host plant and favorable environmental conditons for which the pathogen can develop. Therefore, in order to become familiar with a particular disease you must know the disease's symptoms, the conditions that favor that particular disease and plants that are susceptible to that disease. If you reduce one of the three essential components diseases need to develop you will be able to reduce the impacts of that particular disease or be able to prevent it from occurring. Below are a few diseases commonly seen in greenhouse environments.

Botrytis

Botrytis
PowderyMildew

Powdery Mildew
RootRot

 Root Rot  
                                                                            
Rust

 Rust  
Ring

Viruses

Additional Information

Agdia Testing Inc. – Supplies and Services for Plant Pathogen Testing: http://www.agdia.com/
Cornell Disease Factsheets of Greenhouse & Foliage Plants: http://plantclinic.cornell.edu/greenhouse/index.htm
PennState Plant Pathology Factsheets: http://www.ppath.cas.psu.edu/EXTENSION/PLANT_DISEASE/
UC IPM Pest Management Guidelines ‘Diseases": http://www.ipm.ucdavis.edu/PMG/selectnewpest.floriculture.html
UMASS Floriculture Update 'Diseases Photo Library': http://www.negreenhouseupdate.info/index.php/diseases
Univ. of Maine Plant Disease Images: http://pmo.umext.maine.edu/ipddl/ClinicImages/ImagesOpeningPage.htm


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