Potato Cyst Nematode Globodera pallida (Pale Cyst Nematode = PCN) & G. rostochiensis (Golden Nematode) Handoo -Globose to spherical in shape.

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Presentation transcript:

Potato Cyst Nematode Globodera pallida (Pale Cyst Nematode = PCN) & G. rostochiensis (Golden Nematode) Handoo -Globose to spherical in shape -Prominent anterior neck is present -No posterior vulval cone -Mature cysts are colored red-brown to red-gold -Cyst wall is elastic when probed gently -Cyst cracks cleanly when probed firmly -Eggs &/or juveniles are often visible inside the cyst Webb PCN cysts in a typical debris field - Cysts are shiny when wet and when illuminated under microscope -Round shape ‘stands out’ against most other objects in the debris field -Intact cysts will float in cold water Christopher Hogger, Swiss Federal Research Station for Agroecology and Agriculture, www.forestryimages.org Globodera spp. Heterodera avenae (Cereal Cyst Nematode) Heterodera schachtii (Sugarbeet Cyst Nematode) Compare Globodera (PCN) cysts with two other common cyst nematode species Craig Webb, Ph.D. USDA-APHIS-PPQ Plant Pathologist – Identifier craig.a.webb@aphis.usda.gov

Potato Cyst Nematode IMPOSTERS * = Discriminating characteristics vs. PCN McDonald Cereal cyst nematode -Shiny in appearance -Similar in color to PCN -*Lemon-shaped cyst* -*Posterior vulval cone present* -*Short/curved neck* -Elastic when probed gently Sugar beet cyst nematode -Shiny in appearance -*Tan to brown in color* -*Lemon-shaped cyst* -*Posterior vulval cone present* -Elastic when probed gently G. Caubel/INRA Rennes McDonald Seeds -Some are shiny in appearance -Relatively large in size -Some similar in color to PCN -*No neck/eggs/juveniles visible inside* -*Very hard when probed firmly* McDonald Fungal sporocarps (fruiting body) -*Generally a matte or dull appearance* -*Smaller than PCN (~70 ųm vs ~535 ųm)* -Similar in color to PCN -’Stem’ looks like a neck -*Elastic when probed gently but often shatters when probed firmly*