Tomatoes love the heat and cool temperatures can produce a disease called "Septoria Leaf Spot" The spots start to show up when the first fruit are setting on the plant. They are 1/16" to 1/4" inch in size and you find them first on the lower leaves of the plant (see picture below). The center of the spots have black or brown centers and are surrounded by brown. The tissue that surrounds the spots eventually will turn yellow. The more spots on the leaf the more likely it will just shrivel and die.
"Septoria Leaf Spot" on our plant |
You can also use mulch like grass clippings around the base of the plants to stop the pathogen from going from the ground to the plants. If you need to water the plants (this year that has been rare due to rain) make sure to water at the base of the plant and not to water overhead or get leaves wet.
Tomato ready to harvest |
One day I walked out and the tomatoes were orange and almost ready to pick and the next day they were red with these water soaked dark brown circles underneath. I have had several other people in this state tell me they have had the same issue this year. I did find it interesting that the garden I know of in Alabama (which planted some of my tomato seedlings) hasn't had this issue and also hasn't had this cool moist summer! Anyway it is quite a disappointment when you were ready to eat your tomatoes. The good news is that it can be prevented and stopped after it has begun.
Rain
can cause nutrients to rush out of the soil rapidly - See more at:
http://gardenmentors.com/garden-help/edible-gardens/growing-tomatoes-successfully-despite-cold-temperatures-and-rain/#sthash.cGyeUAHx.dp
Two of our tomatoes with "Blossom-End Rot" |
BLOSSOM END ROT SOLUTIONS:
1. Use a fertilizer low in nitrogen and high in phosphorous.
2. Treat calcium deficiency with one of these options:
a. Epsom Salt- Once a week dissolve 1/2 cup of Epsom salt in a gallon of water and slowly pour all of the mixture around the base of the plant.
b. Tomato Rot Stop- Quick acting liquid calcium chloride you can purchase in a spray. You apply it on the fruit and foilage after you get heavy rain or rapid growth (apply early morning or late evening to prevent leaf burn).
3. Apply mulch to maintain constant soil moisture.
4. Water at the base of the plant and not to water overhead or get leaves wet.
Green tomatoes still on the vine |
Preventative measures for next planting year:
1. Work Epsom salt into the soil before planting tomatoes (and other garden vegetables) in the spring. For a raised bed garden (4x 6 or 4 x 8) apply one pound. For containers and pots use one cup and work into the soil.
2. Several times during the growing season side dress or water the vegetables with 1/2 cup of Epsom salt dissolved in one gallon of water.
I am happy to report that I used Tomato Rot Stop on our tomato plants on the deck and I have been harvesting healthy tomatoes with no more Blossom End Rot! Here is a picture of the harvest......delicious.
Harvest last week of Green Beans, Zucchini, Summer Squash, Cucumber and 2 red Tomatoes with no issues! |
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