Late Blight on Tomatoes
[ I have this posted in the Pests and Diseases Forum (=Garden Clinic) but someone in the Tomato Forum pointed out this forum, which I didn't know about, so I'm reposting it here. ]
In our community garden here in San Francisco we have a small incidence of Late Blight on a few tomato plants, due to the late June rains and cool weather.
I have removed the blighted leaves and stems, but I'm wondering about the 3-4" black areas on the main stems.
1. Should I pull the whole plant - or will it spread to the rest of the plant or other plants ?
2. Is there any treatment for this? I'm curious what the normal methods would be, although we have an organic garden so my options are more limited.
I gather from other replies that it splashes up from the soil, although I think the spores are probably also carried in the wind.
Anyway, it seems that the plants are doomed if infected and living in cool and moist whether.
But if the weather drys and warms. . . ?