Gray leaf spot on newly seeded ryegrass

For those who are seeding ryegrass in August and September, when air temperatures are still well above the threat temperature of 68F (average daily air temperature), gray leaf spot can still be a problem. The frequent irrigation used to assist in seedling germination, when combined with warm temperatures, make conditions even more cushy for the moisture-loving spores of gray leaf spot.

If you are overseeding ryegrass into gray leaf spot damaged roughs or fairways to reestablish the stand, before you…