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by: Leonardo Leuschke


Marketplace > University of Florida > Pathology > PLP 3002 > FUNDA OF PLANT PATHOL
Leonardo Leuschke
GPA 3.6


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Class Notes
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This 7 page Class Notes was uploaded by Leonardo Leuschke on Friday September 18, 2015. The Class Notes belongs to PLP 3002 at University of Florida taught by Staff in Fall. Since its upload, it has received 27 views. For similar materials see /class/206886/plp-3002-university-of-florida in Pathology at University of Florida.




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Date Created: 09/18/15
PLP 3002 Control of Plant Diseases Agrios 9 173 221 General Principles of Control Focus on the Pathogen Exclusion Eradication Focus on the Suscept Protection Resistance Avoidance Cool season planting Sclerotium rolfsii Exclusion Quarantine Old Italian word meaning 40 days Two classic Florida examples Citrus canker Strain A ntroduced in 1910 eradicated by 1949 Reintroduced in 1980 s Bradenton Reintroduced in 1990 s Miami International airport Confused with the nursery strain Coconut lethal yellows Phytoplasma planthopper vector ntroduced in Key West in 1955 then eradicated ntroduced near Coral Gables in 1971 now established Others include Chestnut blight Dutch elm disease Lesser European bark beetle introduced first Fungus introduced in 1930 s beneath bark Plant Quarantine Act of 1912 lntercept Key plants Citrus Potatoes Coffee South America Plants in soil bare rooted cuttings allowed Quarantine Problems Smuggling eg fungus infiltrated seed Latent infections eg bulbs tubers seed Sheer volume eg Colombian flowers Netherlands Political games protecting local industries eg Karnal bunt Germplasm collections Evasion avoidance of Pathogen Location Climate Dryland bean production Crop isolation Upstate NYbeans Low vector activity Andespotatoes Pathogenfree stock Levels of certification Foundation stock Registered stock Certified stock Table stock Pathogenfree seed Legumes peas beans Cabbage cabbage black rot Lettuce mosaic potyvirus Economic constraints Peanut stripe potyvirus scenario From China in 1970 s Regulations rescinded 1992 Pathogenfree vegetative material Potatoes Chrysanthemums Tissue culture High cash value crops Potatoes Eradication Diseased plants Roguing eg CMV in gladiolus Citrus canker coconut lethal yellowing Eliminate alternate host rusts Crop rotation Starve pathogen Sanitation Pesticides powdery mildew Fumigation methyl bromide Solarization mulches Eradication Biological means Conducivesuppressive soils Direct parasitism fungusnematodes Competition for food Antagonism marigolds Trap crops witch weed root knot Eradication Physical means Soil sterilization by heat steam Hot water treatments Refrigeration Stored products Alfatoxins Fusarium T2 toxins bubonic plague All the causes of dryness stop the plague Eradication Chemical means Metalaxyl captan etc Fumigation eg methyl bromide Controlling insect amp nematode vectors eg Temik Direct Protection by Chemicals Foliage sprays amp dusts Protectants versus eradicants Stylet oils Seed treatments Mercury compounds Chemical modes of action Systemic Metalaxyl Not systemic most others Types of Chemical Used Copper Bordeaux mixture Oomycetes bacteria Sulfurs Inorganic powdery mildews Organic Ferbam Fe Zineb Zn Maneb Mn Types of Chemicals Used Acylalanines Metalaxyl Ridomil for Oomycetes Benzimidazoles Benomyl Benlate Halogenated hydrocarbons methyl bromide Choline esterase inhibitors Organophosphates malathionparathion Carbamates Temik Furadan Resistance Cross Protection Papaya ringspot potyvirus mild mutant 39 Resistant varieties not easy Economics kidney bean scenario Specificity horizontalvertical resistance Fran kenfoods


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