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Updated: June 14, 2022
Strategies for Effective Management of Botrytis and Anthracnose Fruit Rot in Strawberries
Managing gray mold (Botrytis) on strawberries is increasingly challenging because of fungicide resistance development, plus a new Botrytis species that is less susceptible to fungicides is becoming common in the mid-Atlantic region. Resistance to certain fungicides is also a problem in management of anthracnose fruit rot. This article describes disease management strategies designed to slow further resistance development, while also providing specifics for managing our two most common fruit rots. Authors: Dr. Mengjun Hu, Univ. of Maryland, and Kathy Demchak, Penn State Extension
Updated: June 3, 2022
Troubleshooting Disease Symptoms in Wheat
Troubleshooting disease symptoms in wheat.
Updated: April 20, 2022
Vegetable and Fruit News-June 2021
Fruit and Vegetable News, Volume 12, Issue 3 (June 10, 2021)
Updated: April 18, 2022
Edema Problem in High Tunnel Tomatoes
I recently received an inquiry from a high tunnel grower about unusual symptoms on tomato leaves.
Updated: October 6, 2021
Downy Mildew in Impatiens
Severe outbreaks of downy mildew in garden impatiens (Impatiens walleriana) were reported first reported in the fall of 2011 on landscape plantings in Europe as well as in the US (Northeast, Midwest). In Maryland, the Plant Diagnostic Lab received its first infected sample in early June 2012. If you grow garden impatiens, it is important to be on the lookout for this disease.
Updated: September 17, 2021
Unusual Foliar Blight Found in Southern Maryland Organic Tomatoes
A very unusual and seldom seen tomato foliar blight was found by an intrepid county educator in Southern Maryland last week.
Updated: September 16, 2021
Using Silicon, Stimplex and Plant Resistance in Pumpkin Production Systems to Reduce Plant Disease Loss
Using Silicon, Stimplex and Plant Resistance in Pumpkin Production Systems to Reduce Plant Disease Loss
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 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.
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