The leaves on my tomatoes growing outside are turning black. I live in New Zealand.
This is a fungal disease caused by other insects. They have an natural product that you can buy from your home improvement that will help with the fungal and strengthen the vine!
This happens a lot of times with tomato plants. When I have had this problem in the past I mix some mild detergent with water and spray the leaves of my plants. If you have cut the plants you can not do this for 24 hours.
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I've included some links below to some websites that may help you identify exactly what is going on with your tomatoes. From what you have described, it sounds to me like you have some type of blight problem going on. If that is the case, disinfecting your greenhouse is going to be essential to preventing further spread.
You may have blight- caused by a fungus in the air. it likes damp warm condition and was bad last year, it is the same a potato blight and could have caught it from nearby potatoes?
Burn all the dead leaves etc. I changed my soil for this year - hope it goes OK.
I lost some last year from the overly wet weather! (FLOODS) I took off ALL the leaves EXCEPT the very top and they lived.
I potted a tomato plant in a white bucket and filled it with soil a little over half full and put it on the porch as we live on the second floor on a busy street. I noticed the plant itself was turning a dark color. I gave it some Miracle Gro and the bottom leaves on the plant went yellow so I took those off. Now the rest of the plant has turned just about all black. There are 2 tomato's growing at the top and they are getting big. What is the plant lacking?
By Gail B
I would say drainage problem and not enough soil.
I just put tomato plants outside in grow bags and now I've noticed the top leaves of the plants starting to go black.
It sounds like a fungus. Perhaps they got too much water.
My tomatoes leaves are turning black underneath. What causes this? They are blooming at this time.
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I have a tomato plant in a large container, and it has 4 small tomatoes on it. Yesterday I noticed that the leaves were turning black as if the plant had been scorched on the edges.