Could be "white rot". We have it and I have to harvest the garlic early (and small) so they don't rot. Doesn't seem to affect the leeks in our case though.
On strimmers, I gave up using one 6 years ago in favour of a grass hook/sickle and haven't looked back. I think it is almost as quick as a decent strimmer and the cut material is easier to rake up to compost. Also fits in a pannier, doesn't need petrol, and isn't noisy (something I only really noticed after having kids and taking them up to the plot only for someone to start up a petrol strimmer next door for an hour)
Could be "white rot". We have it and I have to harvest the garlic early (and small) so they don't rot. Doesn't seem to affect the leeks in our case though.
On strimmers, I gave up using one 6 years ago in favour of a grass hook/sickle and haven't looked back. I think it is almost as quick as a decent strimmer and the cut material is easier to rake up to compost. Also fits in a pannier, doesn't need petrol, and isn't noisy (something I only really noticed after having kids and taking them up to the plot only for someone to start up a petrol strimmer next door for an hour)