Why Are My Tomatoes Rotting On The Vine
Olivia Luz

Tomatoes that rot on the vine are likely suffering from blossom end rot caused by watering practices.
In most cases of blossom end rot a lack of rain or watering causes the soil around the plant to dry. The extent of injury varies with cultivar development stage and specific water soil and weather conditions. This is caused by calcium deficiency in the plant but watering either from nature or from the gardener is most commonly to blame rather than the lack of calcium in the soil. This calcium deficiency is probably caused by irregular watering and fluctuation in water levels.
Secondary pathogens such as bacterial soft rot infects fruits that are first damaged by insects disease cracking heat injury etc. Beautiful ripe tomatoes inedible because of rot. Tomatoes that have been overfertilized with nitrogen are more susceptible. Plants rely on water to carry nutrients like calcium throughout the plant.
If the temperatures fall outside this range blossom drop occurs. Learn how to deal with it and prevent it. Other reasons for blossom drop on tomatoes are insect damage lack of water too much or too little nitrogen and lack of pollination. Are you seeing anything on the foliage or just the fruit.
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With it being late in your season with the accompanying cool temps and humidity and having the tomatoes sprawled the cause is likely fungal in origin. Tomatoes need night temperatures between 55 to 75 degrees f in order to retain their flowers. When a tomato plant receives insufficient water the nutrients will first go to the foliage and may not make it all the way to the fruits. It is a common problem and the disease responsible is called anthracnose.
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