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Tomatoes
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Updated: September 16, 2021
Tomato Plastic Mulch and Shade Study
Tomato plants were transplanted on 7 May 2012 into black (grower standard), white or reflective plastic mulch. Five different varieties of tomato were used: Mt Spring+, Celebrity, Mt Fresh+, Crista and Scarlet Red. When tomato plants began to develop fruit, a 30% shade cloth was randomly placed over 6-10 plants per row.
Updated: September 16, 2021
Tomato Pith Necrosis
In the last week tomatoes from different counties in Maryland were found with the same unusual disease symptoms, called tomato pith necrosis. All the problem tomatoes were from early planted fields. Tomato pith necrosis is caused by the soilborne bacterium Pseudomonas corrugata. It has occurred infrequently in Maryland over the past few decades. The disease usually is found in early planted tomatoes when night temperatures are cool, but the humidity is high, and plants are growing too rapidly because of excessive nitrogen application.
Updated: September 16, 2021
Spotted Wilt Virus in Tomatoes
A couple of high tunnels and even a field of tomatoes have been found with tomato spotted wilt virus in Maryland. The high tunnel finds were not too suprising but the field was a bit as we usually do not see field infections until later in the season.
Updated: September 15, 2021
Southern Blight Found Throughout Maryland this Season
Southern blight is a fungal disease that is most common in the tropics and subtropics, but also is found in the SE United States in the summer. In Maryland we usually find it in the southern part of the state in counties like St. Mary’s, Charles and Wicomico. It has been found this year in more northern counties such as Frederick, Montgomery and Baltimore.
Updated: September 15, 2021
Rain Check in Tomatoes
This has been a very wet period for most of us in the mid-Atlantic. Some fields have received repeated downpours of rain and have standing water while others have not gotten as much. But in almost all of the tomato fields I have found rain check (fig 1).
Updated: September 15, 2021
Potassium and Other Factors Needed for High Quality Tomatoes
Tissue tests taken in tomato fields over the last 6 weeks show that fields with good levels of potassium (K) (>3.2%) have overall lower levels of fruit ripening problems than fields with below recommended levels of K (< 2.5%). Figure 1 shows an example of a tomato with good levels of K, while figures 2 and 3 show what often happens when K levels are too low.
Updated: September 15, 2021
Physiological Tomato Fruit Disorders
Physiological Tomato Fruit Disorders
Updated: September 15, 2021
Ozone Damage to Cucurbit and Tomato Plants
I have been seeing some ozone damage to cucurbits and oddly to tomatoes over the last 2 weeks or so, which is not unusual with the hot hazy conditions we are having. Ozone is the most common air pollutant in the eastern United States.
Updated: September 15, 2021
Nutrient Problems and Their Management in Tomatoes
Nutrient Problems and Their Management in Tomatoes
Updated: September 15, 2021
Helping Fruit Set in Tomatoes
The high temperatures we have had this week and probably next week with daytime highs at 90oF and above and nighttime lows only getting down to 70oF in much of the mid-Atlantic may cause blossom drop and fruit abortion in tomatoes. Ordinarily in tomato fields pollination is achieved just by the action of the wind. Pollen is released from the tomato flower and falls onto the stigma.
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