Frank in Brazil: Zoysia 'Emerald', 6 yrs, 4 in topsoil on sand, tropical, irrigated 2×/day. Small bare spots, hard soil, morning cobwebs. Ronald suspected sod webworms (cobwebs). Follow-up: heavy rain → spongy soil. Ronald: rain rules out insects → likely fungus, but symptoms don't match known diseases. Contact local extension (if in US) or agronomist.
Overwatering + rain = fungal risk. Reduce irrigation. Aerate hard spots.
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