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Updated: September 16, 2021
White Rot of Onion and Garlic
The weather we had in May was great for seed maggots and for some soil diseases. One very serious soil disease that affects Allium species, especially onion and garlic, is white rot, caused by the fungus Stromatinia cepivorum (syn. Sclerotium cepivorum (fig. 1)), which was found in the last few weeks in Maryland.
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 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 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.
Updated: July 22, 2021
Grafting Watermelon for Managing Fusarium Wilt in Southern Maryland
Fusarium Wilt, caused by the soil borne pathogen Fusarium oxysporum f. sp. niveum is becoming more problematic in seedless watermelon production in Southern Maryland. Unfortunately, there are few effective management options for this soil borne disease. New races of Fusarium Wilt are now present in the area that can overcome traditional cultivar resistance. Effective fungicides are limited and do not provide season-long control at labeled rates. In many cases, once a field is infested with Fusarium Wilt, watermelon production is no longer a viable option. One option that has been effective in other areas is grafting of susceptible cultivars onto fusarium resistant rootstocks of interspecific hybrid squash or citron species. Watermelon grafting is more difficult than tomato grafting and is normally done by outside companies who specialize in the technique.
Updated: July 2, 2021
Be On Lookout for Tar Spot: A New Disease of Corn
Before anyone panics, this disease has not been confirmed in Maryland; however, it is close by and could potentially spread to our state. As you’re scouting fields this summer, keep this one in the back of your mind. Tar spot is a fungal disease of corn caused by Phyllachora maydis. It was first discovered in the United States in 2015. In Latin America where tar spot is more common, another fungal species, Monographella maydis, is known to occur in complex with P. maydis; however, only P. maydis has been found in the United States.
Updated: April 7, 2021
Early Season Scouting for Wheat Diseases
Some foliar diseases affecting wheat can be present early in the season. Scout fields early so you can be prepared to make management decisions.
Updated: March 12, 2021
Selected Fungicides and Bactericides Labeled for Greenhouse Use
Selected Fungicides and Bactericides Labeled for Greenhouse Use
Updated: March 12, 2021
Commonly Used Fungicides Registered for Vegetables
Commonly Used Fungicides Registered for Vegetables
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