Brown patches in lawns often trigger concern about lawn grubs, but multiple factors can cause the same symptoms, according to consumer and science-based guidance. When areas of grass turn brown despite appearing healthy elsewhere, the cause may not be grubs at all.
Both outlets note that common alternative explanations include drought stress, dog urine, fungal disease, other pests, and issues such as using too much fertilizer. The Phys.org source emphasizes that brown patches can have many causes, not only insects. The Independent similarly points out that homeowners frequently misattribute the problem to grubs without testing.
In this context, outlets encourage homeowners to perform a targeted check for grubs rather than guessing. The reporting frames grub testing as a way to confirm whether insect larvae are damaging the turf, helping guide next steps only if grubs are present. If grubs are not found, the materials suggest shifting attention to other likely causes such as water balance, lawn health, and potential disease or environmental damage.
