IFCGA Late Blight Update
September 1997

Late blight is caused by a fungus that attacks all the plants in the botanical family Solanaceae, which includes tomatoes,
potatoes, eggplant, peppers and tomatillos.

The fungus has two presentations: asexual zoo spores which are parasitic and require living plant matter to survive and
reproduce; and sexual oo spores which can live in the soil without a host.  Presently, only the zoo spores have been
identified in eastern Idaho but it is very likely that the oo spores will turn up here in the not too distant future.

The most effective action against the zoo spores is the collection and burning of all plant parts including roots
and dropped fruit.  See Maintenance Recommendations below for information to reduce effect of oo spores.

Maintenance recommendations to reduce re-introduction or spread of blight:

Special issues for potatoes:
Many thanks to Karen Barrett (who has been  researching the late blight fungus for the last three years) for
taking the time to share her expertise in this area!!