Determining the Risk Window for Aster Yellows in Carrot: New ...

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Aster yellows phytoplasma (AYp), Ca. phytoplasma asteris Small (0.4 μm diameter) , wall-less prokaryotic organism of the provisional genus Candidatus Infects > 350 species in 38 plant families Phloem limited Has not been cultured Phytoplasma bodies in sieve elements of poinsettia. I.M. Lee Obligately associated with host (insect and plant) and not mechanically transmissible Small genome (~ 700 kb) possibly as a result of reductive evolution Division: Firmicutes Class: Mollicutes Order: Acholeplamatales Family: Acholeplasmataceae Genus: Candidatus 'phytoplasma asteris'
Vector: Aster leafhopper (ALH) Adult Immature - Macrosteles quadrilineatus Forbes (Hemiptera: Cicadellidae) - Approximately 4 mm long and weigh 1 mg (0.8 mg M; 1.2 mg F) - Light greenish-yellow in color (seasonally variable) - Widely distributed in the U.S.
Page 1 and 2: Determining the Risk Window for Ast
Page 3 and 4: Factors Influencing Insect Pest Man
Page 5 and 6: Presentation Outline Goal - Sustain
Page 7: Aster yellows: in carrot Disease in
Page 11 and 12: Aster yellows management WI AY mana
Page 13 and 14: Research and project goal Advance o
Page 15 and 16: Part I: Research questions AYI = re
Page 17 and 18: Part I: variance component analysis
Page 19 and 20: Part I: detection of seasonal trend
Page 21 and 22: Seasonal trends: ALH infectivity Us
Page 23 and 24: Concurrence of AY risk “windows
Page 25 and 26: Research update Part I) Identify tr
Page 27 and 28: Part II: Temperature and ALH develo
Page 29 and 30: Latitude Part II: Thermal time mode
Page 31 and 32: Ongoing and future research We have
Page 33 and 34: Overall summary: refining the AYI A
Page 35: QUESTIONS

Determining the Risk Window for Aster Yellows in Carrot: New ...

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