What is Causing your Plant Problem Biotic living or biological Pests Fungi Bacteria Nematodes Viruses Other parasitic higher plants mollicutes and protozoa What is Causing your Plant Problem ID: 655069
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Slide1
Plant Disease 101
Shannon CarmodySlide2
What is Causing your Plant Problem?
Biotic: living or biological
Pests
Fungi
Bacteria
NematodesVirusesOther: parasitic higher plants, mollicutes, and protozoaSlide3
What is Causing your Plant Problem?
Abiotic: non-living or physical
Too much or lack of water
Extreme temperatures, humidity, light, water
Nutritional toxicities or
deficienciesChemical injury
Mechanical injurySlide4
When these 3 elements occur, plant disease can develop. Reducing just one of these elements helps you manage disease or reduce the potential amount of disease.
Susceptible Host
Virulent Pathogen
Conducive environment
Disease
The Disease TriangleSlide5
What should I do when I have sick Plants?
Diagnosis
Use online resources, extension bulletins, compendia, and other resources:
PNW Vegetable Extension Group:
www.mtvernon.wsu.edu/path_team/vegpath_team.htm
PNW Plant Disease Mgmt. Handbook: www.pnwhandbooks.org American Phytopathological Society: www.apsnet.orgSlide6
What should I do when I have sick
Plants?
Submit a sample to a diagnostic
lab
Private labs
WSU Puyallup Plant Clinic (Jenny Glass)WSU Northwestern Washington Research and Extension Center
Entomology
Plant Disease
Weed Science
Horticulture
Livestock
Skagit County Extension
Other experts in the valleySlide7
Consider
the disease triangle when taking samplesProvide basic crop information:
Age
Size
Cultivar
LocationExposureWeather
Soil
Cultural practices
Pest management
historySlide8
Consider
the disease triangle when taking samplesAsk these 5 questions:
What was the timing of your plant problem?
Is more than one
plant species
affected?How is the field affected on a macro level?How is the plant affected on a micro level?What symptoms and/or signs can you observe?Slide9
What was the timing of your plant problem?
When did symptoms first appear?
How quickly did symptoms develop?
Are symptoms progressing or are they static or declining?
What has happened recently, or in the past, in this area?Slide10
Is more than One Plant species Affected?
What does this tell you about your plant problem?Slide11
How is the Field affected on a macro Level?Slide12
Field distribution of symptoms:
Linear and repetitiveSlide13
Photos by Dr. Lindsey du
Toit
mtvernon.wsu.edu/
path_team
/vegpath_team.htmSlide14
Field distribution of symptoms:
Individual and randomSlide15
Beet curly top virus (BCTV)Leafhopper
vectorPhotos by Dr. Lindsey du Toit
mtvernon.wsu.edu/
path_team
/vegpath_team.htmSlide16
Field distribution of symptoms:
Edge of field, diffuseSlide17
Photo by M. Trent
Iris yellow spot virus
in onion bulb
and
seed crops
Vector
= onion
thripsSlide18
Field distribution of symptoms:
Hot spots: diffuse or sharp bordersSlide19
Stubby root nematode
Photos by Gary
Pelter