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Updated: September 16, 2021
Tomato Plastic Mulch and Shade Study 2012
Tomato plants were transplanted on 7 May 2012 into black (grower standard), white or reflective plastic mulch.
Updated: September 16, 2021
Tomato Ripening Problems and the Role of Potassium
Tomato Ripening Problems and the Role of Potassium
Updated: September 16, 2021
Tomato Ripening Problems and Cucumber Beetles
Tomato Ripening Problems and Cucumber Beetles
Updated: September 16, 2021
Tomato Ripening
Every year about this time I write something about tomato ripening problems I start to see in the field such as blotchy ripening, yellow shoulders, grey wall, internal whitening, etc. (Figs. 1, 2 and 3). By now everyone or most everyone should know that they all have the same root cause; a lower level of potassium (K+) than what is needed by the fruit to ripen properly.
Updated: September 16, 2021
Tomato Problems
To no one’s surprise this week has seen a great number of problems pop-up in tomato fields throughout our area. The first of course has been disease with bacterial and fungal diseases spreading. The fungal pathogens usually can be contained with timely (as difficult as that is) fungicide applications. Bacterial spot or speck on the other hand can be much more difficult to control once it gets started and the weather remains wet and warm. In figure 1 on the right hand side is a row of tomatoes that had been sprayed with fungicides and copper for the last several weeks. Bacterial spot has ravaged this row.
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
Sunscald on Vegetable Leaves
I know it may seem odd to see an article about sunscald or sunburn on leaves with the week of rain we just had, but leaves came in over the last week as the rain started and the damage had been done days before this. It is also possible that there will be a greater chance for sunscald in the coming days as growers try to get their transplants out.
Updated: September 16, 2021
Sunscald Very Prevalent in Peppers This Year
I know this seems very obvious to most growers as we have sunscald every year in our vegetable plantings. This year just seems to be especially bad as I have gotten several calls from growers about a strange problem in their peppers that looks like sunscald, but couldn’t be. The reason given that it could not be sunscald is because the plants have thick foliage and the fruit seem well covered.
Updated: September 16, 2021
Sulfur Deficiency in Corn and Watermelon
In the last few weeks several sweet corn fields as well as some watermelon and even a few tomato fields have been found with sulfur deficiencies (figs. 1 and 2). In sweet corn symptoms often appear as green leaves with light yellow or green striping on the newer leaves (fig. 1). In watermelon symptoms appear as a light green or light yellowing of the leaves of newer growth (fig. 2). In tomato unless severe you usually do not see any visible sulfur deficiency symptoms in the field, but fruit set and quality could be worse
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