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How to scout for plant diseases USDA-APHIS-PPQ-National Seed Health System phytosanitary inspection reference –http://www.seedhealth.org/standardization/

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Presentation on theme: "How to scout for plant diseases USDA-APHIS-PPQ-National Seed Health System phytosanitary inspection reference –http://www.seedhealth.org/standardization/"— Presentation transcript:

1 How to scout for plant diseases USDA-APHIS-PPQ-National Seed Health System phytosanitary inspection reference –http://www.seedhealth.org/standardization/ RMB0402.pdfhttp://www.seedhealth.org/standardization/ RMB0402.pdf

2 How do I start? Look the field over: are there any spots you should focus on? (depends on what you’re looking for) –Low areas –Edges –Microclimates Decide on a sampling pattern Scout at the appropriate growth stage for the disease of interest Note symptoms and signs Get samples properly diagnosed if needed

3 “Stagger X pattern” “Equidistant passes pattern”

4 Patterns of plant disease x Regular Random Clustered x x x x x x x x x x x x x xx xxx x x x x x x x x x x x x Examples: Wind-borneSeed-borneSoil-borne (foci) - RustsStubble-borneNematodes Contaminated potato seed pieces Irrigation lines (nozzles)

5 Sampling patterns x x x x x x x x x x x x x xx xxx x x x x x x x x x x x x

6 Other sampling patterns (take a sample in each quadrat)

7 “Arbitrary” vs. “Random” Arbitrary: choose plants as walk along pattern, perhaps at even intervals like ‘every 3 steps’ Random: must use a random number generator or other random method to select plants (eg. numbers in a hat)

8 How many samples should I take? “minimum of 95% confidence level in detecting an infection level of 0.1%”


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