I Have Tomato Plants That When The Tomatoes Set On…
Evelyn Asked
I have tomato plants that when the tomatoes set on and are still small, they rot on the bottom. I also have grapes that dry up shortly after the set on the plant. I keep them watered. Why are they drying up?
The Gardener’s Answer
Hello, Evelyn: It sounds like your tomatoes have what is known as blossom end rot. This is a physiological disorder that is caused by a calcium deficiency usually brought on by consistently wet soil or uneven moisture levels. It is not that the soil is lacking calcium but it is not available for the plants to absorb. It will not kill your plants but you do want to remove all infected fruit. Consistent moisture will help prevent rot on future tomatoes. As for your grapes, there are many different fungal problems associated with this fruit but the most common problem found with grapes grown in Kentucky is known as black rot. This is a fungus that will cause infected berries to shrivel up and look more like raisins than grapes. It can be controlled by good sanitation and potentially a spraying program, but the most important step in eliminating the problem is to have it positively identified. Black rot will overwinter so good sanitation practices are very important in keeping insects and disease problems under control. Remove and dispose of all infected grapes still on the vine as well as the ones that have fallen. Keep the area around your vines free of all plant debris. As with all plant material, if we do not give them ideal conditions to grow in we are making them more susceptible to insect and disease problems. Grape vines should be planted in full sun with good air circulation. For a positive identification you can take a sample to your Cooperative Extension Service or to a local garden center with a knowledgeable staff.
