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Jun 07

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Blossom-end rot of tomatoes

It is that time of year when many gardeners are beginning to harvest great tasting vegetables.   It can also be a stressful time because of the many insect and disease problems that we may have to deal with.  It is very frustrating when we reach for that tomato that we have been watching develop and realize that it is rotten on the bottom. Blossom-end rot is a major problem for many home gardeners. There are several things we can do to reduce or prevent the problems of blossom-end rot.

Blossom-end rot of tomatoes is a physiological disorder caused by a lack of sufficient calcium in the blossom end of the fruit. This problem results in the decay of tomato fruits on the blossom-end. This disorder is usually most severe following extremes in soil moisture.

To reduce the incidence of blossom-end rot in tomatoes, implement the following steps. Check the pH of your garden soil. The ideal pH of a garden soil should be 6.5 to 7. Home gardens not limed in the past 2 to 3 years could probably benefit from an application of lime. Apply 50 to 100 pounds of lime per 1000 square feet to correct soil acidity. To determine the exact amount of lime, send a soil sample to one the soil testing labs.

Applying too much fertilizer at one time can result in blossom-end rot. Following soil test recommendations is the best way to insure proper fertilization.

Mulch the plants with straw, leaves, decomposed sawdust, plastic, newspapers or compost to help conserve moisture and reduce the problems of blossom-end rot. In extreme drought, plastic may increase blossom-end rot if plants are not watered.
Tomatoes require approximately 1.5 inches of water per week during fruiting. This amount of water should be supplied either by rain or irrigation. Extreme fluctuations in soil moisture result in a greater incidence of blossom-end rot.

The plants may be sprayed with a calcium solution. Use products containing calcium nitrate or calcium chloride. Be sure and follow all label directions. Most of the calcium sprays should be applied at least once per week, beginning at the time the second fruit clusters bloom. These materials can be mixed with the spray that is used for control of foliar diseases. Several spray materials containing calcium are available and all work well for tomatoes.

Another common question we have been receiving from many gardeners, deals with poor fruit set on tomatoes.  The plants look great and have a good color, but are not setting tomatoes.   Several conditions can cause tomatoes to not set fruit. Too much nitrogen fertilizer, nighttime temperatures over 70 degrees F., low temperatures below 50 degrees F., irregular watering, insects such as thrips or planting the wrong variety may result in poor fruit set. Any of these conditions can cause poor fruit set, but combinations can cause failures. If recommended varieties are used, the most common reason tomato plants do not set fruit is because they are not planted where they can receive 8-10 hours of direct sunlight daily. Any less direct sunlight will result in a spindly growing, nonproductive plant with healthy foliage.

Master Gardener Learn at Lunch Program

Gregg County Master Gardeners, Learn at Lunch program, will be Wednesday, June 8.  Daniel Duncum, Texas Forest Service, will speak on Tree Identification, at the Gregg County Extension Office, 405 E. Marshall Ave., Longview, noon to 1:00 p.m.

Mr. Duncum holds a Bachelor of Science degree from Stephen F. Austin State University and has been with the Texas Forest Service for 31 years.  He is the Urban District Forester, a local arborist, specializing in tree care, and a wildland fire fighter.

The Master Gardeners’ meetings are on the second Wednesday of each month and are open to the public. For Information, call the Texas AgriLife Extension Service at 903-236-8429

Dennis Smith can be contacted at the Gregg County Extension Office by e-mail at
dg-smith@tamu.edu or telephone at: 903-236-8429.

Extension programs serve people of all ages regardless of socioeconomic level, race, color, sex, religion, disability, or national origin.

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