TechNotes Tips - 05.18.01

The dry conditions occurring though the Great Plains and Midwest has enhanced the presence of rust. Rust infects slow growing cool season turfgrasses. Perennial ryegrass is especially susceptible to this disease. The early symptoms of rust appear as yellow flecks on the leaf blade and sheath. These flecks expand becoming more obvious. The fungus will produce spores that erupt through the leaf blade producing the orange colored pustules. Providing irrigation and fertility to promote growth are the major cultural management strategies for this disease. Fungicide applications may be necessary in situations where the disease is severe.

Gypsy moth populations may explode in areas where dry conditions persist. The natural predator of gypsy moth is a fungus, Entomophaga, is of little help with dry conditions persist. Applications of BT for the control of gypsy moth are currently being made through the northeastern United States. For more information on the control of this pest with BT see: www.ag.ohio-state.edu/~ohioline/hyg-fact/2000/2174.html.