It’s been awhile since we’ve plugged this book, so I’ll do it again:
It’s a terrific resource for any turfgrass manager. You can find more details about the contents and purchase it at this website:
Summer patch symptoms tend to show up when heat and drought fire up in late June/July/Aug, but the infection occurs in mid/late spring. The fungus is soilborne and attacks roots. When the daily max soil temperatures at 2-3 inches deep are consistently (3 days in a row) above 65, that’s a good time to make a first application. Follow up 28 days later, or according to label intervals. Normally, around here, that temperature threshold comes in late April/early May but this year things are warming up faster than normal. Check the soil temps at your site – you may be surprised!