Produce > Pests & Diseases

Blight has reached my greenhouse

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sandersj89:
Yep, that is it.

Once the leaves drop the spores onto the fruit they will start developing a brown tinge. The flesh also starts to have a wrinkled feel to it.

The leaves then get darker and the fruits turn almost black and go soft.

Bin them ASAP, remove all the plant material and burn or bin. Afraid I would be too worried to put them in a compost heap.

I have picked loads of toms of three affected plants this year that were still green or only just starting to turn. These I washed and then placed in trays in the shed. I check each day and throw out a few as they still succomb sometimes. I expect 50% losses.

Jerry

john_miller:
I'm posting this because someone reading the above may get the wrong impression. Both Dithane and Bordeaux compound are protectant fungicides with minor preventive value. They are not systemic (i.e. translocated through the vascular system of the plant) so any new growth produced after application will not be protected. This is one reason it is recommended that both are applied repeatedly during the season, 7-10 days is the generally recommended interval. While I certainly am not disputing that sanders has only made one application in May and not been affected by blight subsequently, this will have been due to other factors, not the fungicide applied 4 months ago.

tim:
OF COURSE - blind as a bat!! Thanks, John.

But presumably of some help, depending on the amount of foliage at the time? = Tim

sandersj89:

--- Quote from: tim on September 10, 2004, 06:43:53 ---

But presumably of some help, depending on the amount of foliage at the time? = Tim

--- End quote ---

Sorry, should have made it clear, my toms were sown under light and in a heated greenhouse in Early Jan. As a result by May I had already stopped their growth at the eaves of the greenhouse in question. So very little new growth of foliage as the trusses developed.

Jerry

john_miller:
More than some, Tim. Properly applied bordeaux compound is close to 100% effective. Improperly applied, as I do (rain or lack of time invariably interferes with a regular schedule), it still saves the crop! I would also mention that baking soda certainly seems to have had very good control of early blight (Alternaria solani, not Phytophthora infestans) on the few plants I sprayed it with.

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