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Santa Barbara County Agricultural Commissioner
Plant Pathology Entomology Heather Scheck Brian Cabrera
Santa Barbara: 681-5600 Santa Maria: 934-6200
Plant Pest and Disease Diagnostic Services
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Plant Pest and Disease Diagnostic Services
Plant Pests Only * Arthropods and Mollusks Pathogens and Nematodes Weeds *spiders, structural pests OK
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Santa Barbara County Agricultural Commissioner
•Enforcement of federal, foreign and domestic plant pest quarantines •California state exterior and interior quarantines •County restrictions and ordinances
Pest Exclusion
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The Goal of Exclusion: Regulations based on BIOLOGY The Politics of Exclusion: Some regulations used as ECONOMIC EMBARGOES
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Low High
PEST RISK
ENTRY STATUS
Conservative
Liberal
Politics Economics
Politics Economics
ENTRY STATUS vs. PEST RISK
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Phytosanitary Certification –
Shipments for export must be certified as meeting the pest exclusion requirements of other countries and states, and accompanying documents are prepared stating the commodity is free of specific pests of quarantine concern.
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Phytosanitary Certification of Seed • obligated to fulfill the official requirements of states and countries buying California-grown seed • make inspections as necessary to meet the requirements of the importing state or country.
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Beans = Flowers = Vegetables 2,094 acres – unchanged over 20 yrs
Valued at $9.6M
Santa Barbara County Seed Crops 2011
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PQ program is concerned only with diseases that are seed-borne – Some diseases on the list are common in our area, some are rarely seen, and some are never seen.
Presence of pathogens must be confirmed by lab analysis.
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Growers select seed production sites in areas where pathogens • are not present • the environmental conditions do not
favor disease development
PQ Seed Program
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Following inspection protocols provides for a minimum 95% confidence level in detecting an infection level of 0.1% in the field.
Beans need three inspections: 1st – seedling 2nd – mature vines with green pods 3rd – windrow
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Bean Anthracnose
Colletotricum lindemuthianum • Infects stems, leaves and pods
• Needs cool, moist climate
• Mainly on the underside of leaf and veins turn brick red
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Bean Halo Blight
Pseudomonas syringae pv. Phaseolicola • Infects leaves and pods
• Cool and humid conditions
• Seed is shriveled, yields low
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Bean Common or Fuscous Blight
Xanthomonas campestris pv. phaseoli • No resistant varieties
• Needs high humidity for epidemic
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Bean Common Mosaic Virus
• Potyvirus spread by seed and aphids
• Necrotic strains not known to occur in CA
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Ascochyta fabae • Leaf and pod spots • Rapid disease development in cool, wet weather
Fava Beans -Leaf and Pod Spot
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Broad Bean Stain Virus • Not known to occur in USA
Broad Bean True Mosaic Virus
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Mystery Potyvirus
Seed borne????
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Alternaria brassicae and brassicicola
Brassicas - Alternaria Leaf spot/Head rot
• Surface or internal • Concentric rings and a shot-hole effect
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Mycosphaerella brassicicola • Mainly on brussels sprouts • May or may not be seed borne
Ringspot
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Phoma lingam • Usually found as stem lesions at soil line but can also be leaf spots
Black leg, Phoma leaf spot & canker
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Bacterial Blight: Pseudomonas syringae pv alisalensis Bacterial Leaf Spot: Pseudomonas syringae pv maculicola • Problem for greenhouse transplants
Bacterial diseases
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Xanthomonas campestris pv campestris • Can cause severe damage • Weeds are important resevoirs
Black Rot
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Acidovorax avenae subsp. Citrulli • Watermelons only
Cucurbits -Bacterial fruit blotch
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Cladosporium cucumerinum • Cukes, pumpkins and summer squash • Wet and humid conditions
Scab
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Colletotrichum orbiculare • Mostly seedless watermelons • Warm, humid conditions
Anthracnose
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Didymella bryoniae • Mainly a tropical disease but found on
watermelons in CA
Gummy Stem Blight/Black Rot
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Fusarium oxysporum (wilt) Fusarium solani f.sp. cucurbitae (crown and foot rot)
Fusarium Diseases
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Pseudomonas syringae pv. Lachrymans • Most common on cucumbers but other melons too • leaves look tattered as sections drop out
Angular Leaf Spot
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Cucumber mosaic virus
• Aphid transmitted and Maybe seed-borne
• Very wide host range
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Squash mosaic virus
Vectored by the spotted cucumber beetle (Diabrotica)
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Tobacco ringspot virus
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Zucchini yellow mosaic virus
• Vectored by many species of aphid, not seed borne
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Disease of unknown etiology
• Watermelon seed crop
• Positive for Watermelon Mosaic virus but not known to cause
these symptoms
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