Posted: 11/08/2012 at 15:41
Leggi, if the stems are quickly turning black it sounds like it could be Late Blight. If so, there's no saving the plant.
In general, spraying once any fungal disease symptoms are already present is a waste of time and money. It's too late. Spraying has to be preventive, meaning you spray before the spores arrive, starting a couple of weeks after planting out, then weekly or so afterwards, respraying if it rains.
Spraying doesn't guarantee you won't get fungal disease but it gives you a solid defence.
Dove - good luck!
Thanks, I think I may have to start regularly spraying them next year then. This is my fifth year of trying to grow tommies and my fifth year of blight. I've done all I can think of, not watering at all unless the plants wilt, changing the soil they grow in, giving them more room to grow (raised bed went from having 6 plants in it a few years ago to two this year) and trying to grow them in different parts of the garden has lead me to trying some in the front garden this year.
It appears that blight seems to be a problem in my area so I will just have to keep spraying if I ever want a good crop of home grown tomatoes.
This years crop so far - half a cherry tomato.