Chiggers can be controlled with a broadcast application of diatomaceous earth or an application of granular or dusting sulfur at 5 pounds per 1,000 square feet. If you have alkaline soil, the sulfur is also a good soil amendment. If you have acid soil, just don't overdo it. Excess sulfur will kill or severely imbalance the microorganisms in the soil. If your property is watered occasionally, chiggers won't be a problem.