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Plant PathologyPlant Pathology
David R. Drake
PathologyPathology
The study of disease.
DiseaseAnything that causes abnormal
growth
Plant DiseasePlant Disease
Any disturbance of a plant that interferes with its normal growth and development, economic value, and aesthetic quality;
a continuously, often progressively affected condition in contrast to injury, which results from momentary damage.
Source: Plant Diseases: Their Biology and Social Impact. Gail L. Schumann APS Press
Historical Plant DiseasesHistorical Plant Diseases
Irish Potato FamineAmerican Chestnut BlightDutch Elm Disease.St. Anthony’s Fire Tulip Virus
St. Anthony’s FireSt. Anthony’s Fire
ErgotPrevalent in Rye
Tulip VirusTulip Virus
Tulips introduced to Europe circa 1550Virus infected bulbs created Tulipmania
from 1634-37.
PRICE BARTERED FOR 1 BULBPRICE BARTERED FOR 1 BULB
4 Tons Wheat 8 Tons Rye 4 Fat Oxen 8 Fat Pigs 12 Fat Sheep 2 Hogsheads Wine
4 Barrels Beer 2 Barrels Butter 1000 Lbs Cheese 1 Bed with Accessories 1 Full-dress Suit 1 Silver Goblet
Types of PathogensTypes of Pathogens
ParasiticNon-parasitic (abiotic)
Pathogen
Host
Environment
Factors in Disease:Factors in Disease:Disease TriangleDisease Triangle
ParasiticParasitic
FungiBacteriaVirusNematodesprotoplasmaParasitic plants
FungiFungi
Lack cholorphyll100,100 – beneficialMost microscopicSporesFungicides
BacteriaBacteria
Single-celledBinary fissionRapid multiplicationFree moistureBactericides
VirusVirus
Protein and nucleic acidSub-microscopicInsect vectoredMechanical transmission
NematodesNematodes
Microscopic eel wormsEggsStyletVirus vectorsNematicide
ProtoplasmaProtoplasma(mycoplasma)(mycoplasma)
Similar to bacteriaNo cell wallVectored by leafhoppersControlled with antibiotics
Parasitic PlantsParasitic Plants
Dodder
Non-parasiticNon-parasitic
Iron chlorosisPowdery mildewCytosporaFire blight
Iron Chlorosis
Powdery MildewPowdery Mildew
Halt (thiophanate methyl)BenlateFunginexBayletonSulfurTilt
FunginexFunginex
Roses– Powdery mildew– Rust (rare)
Fruit– Powdery mildew– Brown rot (rare)
CytosporaCanker
Fire Blight
Fire Blight ControlFire Blight Control
Avoid excess nitrogenPrune out cankersTreat with fixed copper or streptomycin
CuitlachocheCuitlachoche
Safflower oil Onion chopped Garlic chopped Chilies Cuitalchoche
3T
2T
2
4
4 Cups
Saute’ until translucent
Verticillium Wilt
ChlorothalonilChlorothalonil
Disease control with DaconilDaconil lawn and garden fungicideDaconil 2787Multi-purpose fungicide
White Mold
Slime FluxWet Wood