I am having problems with black spots on the stems and leaves of my tomato
plants. I have about 10 plants and about half are affected. I have been
spraying them with Ortho Disease Control and removing the affected stems and
leaves but the problem seems to get worse. I have even been watering close to
the ground to avoid splashing dirt on the plant.
Is there any way to save my plants? I would rather not have to destroy them
and start over if I don't have to since I have invested a lot of time into
Most likely it's blight. If you want to save the rest of the crop, you
have to completely remove the damaged plants now...I found this tidbit
Early blight (Alternaria leaf spot) (Figure 5) is caused by the fungus
Alternaria solani. Symptoms become prevalent during the hotter months.
This disease produces brown to black, target-like spots on older leaves.
If severe, the fungus also attacks stems and fruit. Affected leaves may
turn yellow, then drop, leaving the fruit exposed to sunburn. Sanitation
is the best control. Remove all diseased plant tissue on the ground, as
the fungus overwinters on leaf debris. Do not plant tomatoes in the same
place next year. Space plants farther apart to improve air circulation.
Avoid overhead irrigation. If the infestation is heavy, sulfur dust may
help protect new leaves from infection.
I've had blight and it ravaged the entire crop in a matter of days. My
problem that year was that they were planted too close together so they
got no circulation and the disease spread quickly since the leaves were
touching eat other.
The same applies to potatoes. Neither should be planted near each other
and the same soil should not be used in subsequent years. If you're
unable to save that crop, plant the next one elsewhere....or perhaps
start another one in another spot now....well away from the diseased
plants. Also...don't compost the diseased plants - it'll just pass on
the disease (I never compost any part of the tomato plant - disease or no).
Zone 5a in Canada's Far East
Every tomato gardener should have this page
bookmarked. See if you can figure out exactly what disease in on the
leaves so you can apply the correct remedy.
If you're still not sure, put a couple of the leaves in a baggie, and
take them to your local extension agent or to a nursery with a
The key is identifying what you have, so you can get proper treatment
for the tomatoes.
"Maybe you'd like to ask the Wizard for a heart."
"ElissaAnn" < firstname.lastname@example.org>
My plants seem to look the most like this picture here:
Are my plants doomed or will this copper spray provide adequate protection?
This is a common fungus on tomats, usually starting on the lower leaves and
works it way up. If it gets going early in the season and it/s not
controlled, your crop can be quickly doomed.
Get Ye Some Fungicide and Applyith Forthwith - Double Strength - and All
Will Not Be Lost! Spray weekly until the solution begins to drip from the
leaves throughout the growing season for best results.
I like Maneb v. Daconil products b/c for the same money, you use less with
Avoid copper sprays, if you can b/c they tend to clog sprayer tubes and
Some fungus diseases result from rainwater splashing off infected soil, so I
apply a mulch of grass clippings to reduce that risk.
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