Solanum sarrachoides Sendtner
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Hairy nightshade found to be alternate host for potato late blight


Name: Solanum sarrachoides Sendtner
Taxonomic Position:
Plantae: Solanaceae
Common Names:hairy nightshade

Potato late blight, which is caused by Phytophthora infestans, costs growers throughout the world more than $3 billion in fungicides and other control measures. Extension agents in northern Maine discovered hairy nightshade (Solanum sarrachoides) plants speckled with dark and oily spots on the foliage. Scientists in the USDA’s Agriculture Research Service (ARS) analyzed the plants and verified that the hairy nightshade is an alternate host of P. infestans. A limited survey found that over half of the fields in Maine contain hairy nightshade. Growers should be encouraged to incorporate control of hairy nightshade into their late blight management program.


Peabody, E. 2006. Weed implicated in Potato Blight Persistence. USDA-ARS News. 12 December 2006. Available online:

Warning: The information in this alert has not been confirmed with the appropriate National Plant Protection Organization and is provided solely as an early warning. Please use the above information with caution.

Phytosanitary Alert System
Pest Alert
Prepared on: 12/14/2006