What’s New
New Fact Sheets Published Online (see links below)
1. Pythium Blight of Turfgrasses
Impatiens Downy Mildew Outbreak
The destructive disease impatiens downy mildew has been confirmed in CT this summer. Early symptoms of the disease begin as light-green yellowing, mottling, or stippling and often go unnoticed. Advanced symptoms include stunting of whole plants, downward curling of leaves, wilting, and severe defoliation that results in bare, leafless stems. The diagnostic sign of the disease is white "mildew" visible on the lower surface of diseased leaves. For more information, please see the fact sheet Downy Mildew of Impatiens . Plants suspected of having this disease should be sent to the PDIO for analysis. Linked please find the Sample Submission Guidelines.
A New Disease - Boxwood Dieback
Boxwood dieback was first reported in the United States in 2015 and has been detected in a number of states in the south and south eastern U.S. In August 2020, the disease was first detected in Connecticut. The characteristic symptoms of the disease are significant diebacks with brown leaves attached on stems (Figure 1), black fungal fruiting bodies on stems and leaves (Figure 2), and blackening of stem tissues (Figure 3). For the detailed information of the disease, please read the linked fact sheet, Boxwood Dieback.
Figure 1. Dieback
Figure 2. Black fungal fruiting bodies Figure 3. Blackening of stem tissues
June 2020
Beech Leaf Disease Has Been Found in New Haven County, CT
Since beech leaf disease was first detected in Fairfield County, CT in 2019, it has been identified in New Haven County, CT in 2020. For details, please read Press Release CAES Announces First Report of Beech Leaf Disease in Hamden and New Haven, Connecticut and our fact sheet on Beech Leaf Disease.
Beech leaf disease and beech anthracnose in the spring 2020
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Outbreak of Maple Anthracnose - Spring Leaf Drop
Recently, numerous reports of spring leaf drop of maple trees have been received in our office. Fallen leaves were found on decks and lawns (see photos below). Yellowing and blackening of leaves were resulted from severe infection of maple anthracnose due to prolonged cold wet spring weather this year. Linked please read a fact sheet Common Diseases of Maple that describes this disease.
New Fact Sheets
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