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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 15, 2021
Sanitation Important in Transplant Production Houses
By now almost all growers have started transplant production or have hired someone else to grow their transplants. With all of the important things that go into transplant production one of the sanitation factors that is somewhat neglected is weed control. Figure 1 shows the outside edge of a high tunnel production house in February. The grower was getting ready to drop seed in just a few days after they cleaned up the house from the fall growing season. This particular grower had been having intermittent problems with thrips (and consequently tomato spotted wilt virus) and two spotted spider mites in their production house.
Updated: September 15, 2021
Plectosporium Blight Common in Pumpkin Fields this Year
By this time of the season I usually see pumpkin fields infected with powdery mildew pretty commonly throughout the mid-Atlantic. And while powdery is present in many pumpkin fields it does not seem as bad as in previous years.
Updated: September 15, 2021
Physiological Tomato Fruit Disorders
Physiological Tomato Fruit Disorders
Updated: September 15, 2021
Gummy Stem Blight in Cantaloupe
Gummy stem blight (GSB) was found in an Eastern shore muskmelon field in the last few weeks. It is a cucurbit disease caused by the fungal pathogen Didymella bryoniae. This fungus is favored by cool to warm, rainy weather. It can infect a host at any stage of growth and affects almost all parts of the plant including leaves, stems and fruits.
Updated: September 15, 2021
Frequent Heavy Rains = Lots of Vegetable Disease Problems
I do not have to tell you that these frequent and heavy rains we have been having over the last 2-3 weeks have really increased the amount of foliar and at times soil diseases in our vegetable crops. In cucurbits foliar diseases such as Alternaria, gummy stem blight and an odd one Cercospora (figs 1a, 1b) all have been found causing moderate to severe defoliation in some fields that are heavy with fruit.
Updated: September 15, 2021
Does it Pay to Graft Tomatoes for Increased Yields When There are No Soil Disease Problems
Tomatoes are grafted by joining the top part of one plant (the scion) to the root system of another plant (the rootstock) (fig. 1). The resulting plant is usually more vigorous and productive.
Updated: September 15, 2021
Black Dot Root Rot - Seldom Seen Tomato Disease Found in High Tunnel
A root disease that is most commonly associated with potato has turned up on tomato in a high tunnel last week. This disease goes by the delightful name of black dot root rot. The causal agent is Colletotrichum coccodes, which also causes anthracnose fruit rot on tomato (sunken, water-soaked, circular lesions).
Updated: September 15, 2021
Be Alert For Late Blight Showing Up On Tomatoes
Another disease we might be seeing now and in the next week or so is late blight. The weather conditions of the past week have been favorable for its development: cool (for summer temperatures) daytime and nighttime temperatures along with ample moisture.
Updated: September 15, 2021
Club Root Found in Brassica Crops
It is odd that we would have a couple of reports of an unusual disease of brassicas turn up in the same week, but we did. Clubroot caused by Plasmodiophora brassicae is a major disease of brassica, i.e., broccoli, cabbage, turnip, rutabaga, and radish. It can also infect weeds in the mustard family as well as some grasses.
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