11/10/2023 0 Comments Michigan tomato late blightAs lesions mature, very small, dark fruiting structures form beneath the infected fruit tissue. Under favorable temperatures, lesions on ripe fruit become visible within 5 to 6 days after the initial infection. Lesions increase in diameter and coalesce, leaving a large, sunken, soft area. Anthracnose fruit rot symptoms begin as small, dark, sunken lesions that have a water-soaked appearance. Fruit may become infected while green, but symptoms do not appear until they become ripe. Symptoms include slightly sunken circular lesions that may expand and coalesce. Symptoms appear only on ripe or senescent fruit (Green fruit can become infected, but the symptoms do not appear until the fruit ripens). ![]() Without good fungicide control, 70 percent of the fruit may become diseased. The disease normally spreads from the lower leaves to the upper leaves on the diseased plants.Īnthracnose is considered to be the most serious ripe-fruit rot of tomatoes. These spots will increase in size, with the centers of these spots becoming light tan in color with dark margins. In general, a tomato plant infected with Septoria will have lower leaves that have become peppered with small, dark circular spots. This loss of foliage results in yield loss and sunscald of the remaining fruit. Rapid defoliation of Septoria-infected plants may occur when the weather is warm with frequent rain showers. This is a common foliar disease and may occur on the tomato plant along with other tomato-loving pathogens. Septoria blight is severe in our tomato research plots in East Lansing and appears to progressing rapidly on plants that were not protected with fungicide. A 3- to 4-year crop rotation can help reduce the levels of the early blight fungus in the soil. Heavy dews, extremely humid weather and abundant rainfall are essential for early blight. ![]() Infection is greatest in warm weather (75 to 85 degrees Fahrenheit). ![]() The early blight fungus causes dark brown, leathery sunken spots with concentric rings. Infection can occur at the point of attachment to the stem and through growth cracks and wounds on the fruit. The most common fungal leaf blight and fruit rots of tomato in the Michigan production region are early blight (Alternaria solani), Septoria blight (Septoria lycopersici), and anthracnose (Colletotrichum coccodes).Įarly blight infects foliage and ripening fruit and seems to be especially troublesome for growers who have not kept up on their preventive fungicide sprays. By Mary Hausbeck, Michigan State University Extension, Department of Plant, Soil and Microbial Sciences
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |