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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
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
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
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
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
Old News But It Pays To Clean Up Your High Tunnel In The Off-Season
I know growers are very aware that they should clean up their vegetable fields and high tunnel (HT) of old crops and weeds during the off-season. I also know that growers have many other things that need to be done during this time and they can’t quite get to the cleaning. But spending some time now thoroughly cleaning up a high tunnel that is no longer in production rather than letting it sit over the winter will vastly improve your pest problems for the next year.
Updated: September 15, 2021
Oh Hail Yes
Last week I had a call from a vegetable grower who thought they might have Allium leaf miner (LM) pretty bad in their onion field. While this grower was organic (synthetic pesticide use reduces Allium LM risk) and in the northern part of Maryland I was skeptical about Allium LM being a really bad problem in onions. As I approached the onion field it did look like the pictures I have seen of Allium LM damage in Pennsylvania. The onions were broken and falling over one another and there were white marks on the onion stems (fig. 1), just like what has been seen in PA (fig. 2).
Updated: September 15, 2021
Odd Cold Damage in Potato Field
An odd cold/frost event occurred in a potato field just this past weekend (May 9 and 10). On Saturday morning the grower noticed dark brown necrotic areas appearing on some of their potato plants (fig. 1). Up-close some of the leaves with the necrotic areas appeared to have white fuzz on the underside of the leaf (fig. 2), which could indicate late blight.
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