Drop him some e-mail. While he can't answer individual questions directly, he will use the most interesting questions in future columns. Odds are those circular, yellow burn marks forming on your lawn are not the work of hot exhaust from UFO engines. The invaders probably aren't aliens from outer space, but insects from inner earth.
Summer is prime time for the chinch bug.
This insect has a voracious appetite for grass roots, especially in yards that have been overwatered. When the bug eats, the grass dies - usually in a circular pattern. The best thing is to catch them early on. Once identified, it doesn't take a rocket scientist to nuke these critters. The process is more like a sixth-grade science experiment.