Leaf spot and melting out are caused by which of the following?

Leaf spot and melting out are caused by which of the following?

• A. Bacteria
• B. Several different fungi, most common on Kentucky bluegrass and tall fescue
• C. Viruses
• D. Nematodes

Answer: (B)

Leaf spot and melting out are fungal diseases that attack cool-season grasses. They are caused by several different fungal species, not just one pathogen, and these diseases are especially common on Kentucky bluegrass and tall fescue. The fungi produce leaf spots and can cause the tissue to collapse or melt out, especially under conditions that favor fungal growth such as warm, humid weather and leaf wetness. This understanding helps explain why monitoring moisture, avoiding excessive nitrogen, and using appropriate fungicide timing during high-risk periods are important for management.

Leaf spot and melting out are fungal diseases that attack cool-season grasses. They are caused by several different fungal species, not just one pathogen, and these diseases are especially common on Kentucky bluegrass and tall fescue. The fungi produce leaf spots and can cause the tissue to collapse or melt out, especially under conditions that favor fungal growth such as warm, humid weather and leaf wetness. This understanding helps explain why monitoring moisture, avoiding excessive nitrogen, and using appropriate fungicide timing during high-risk periods are important for management.