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– A fungus or other disease is attacking your grass. Action: Lay off the fertilizer (fungi often thrive on the N). Aerate the grass with one of those prongy things (you can get spiked shoes, or a handled aerator tool, or a spiked roller, or a ride-on thing that will cover acres). If that fails, you could consider an antifungal treatment.

– Insects are attacking your grass, possibly beneath the surface. (A clue is if insectivorous birds are particularly interested in the brown patches.) Action: Wait for the predator/prey cycle to take care of it. Or consider an insecticide.

– An animal (e.g. dog) has started pissing on the lawn, killing the grass in patches where the urine goes. Action: Stop it doing so. How to do that depends on the animal. Camera trap would yield useful information and be a fun project if you like that sort of thing. (If you have a spare computer lying about, you only need some free software and a webcam.)

– The ground is bumpy and mowing the hilly bits cuts the grass too close. Action: Raise the mowing height when you mow.

– Grass is dying because of lack of water. Seems unlikely in the circumstances, although it could be local compaction making the ground water-impervious. Action: If it’s compacted, try aerating it as above. Water it, or just wait until it rains again. Grass is pretty robust, unless you cut the sward very close. (This is why bowling greens and golf courses have to water a lot.)

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Two-boxing is a statement that Omega is not competent enough to predict you will two-box.

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