Early blight

What you see

Brown spots with distinctive concentric rings (a bullseye) on the OLDEST leaves first, with yellow halos; works its way up the plant.

Conditions

Warm weather on stressed or hungry plants; splashing irrigation spreads it from the soil.

Treatment

Remove affected lower leaves; feed the plant (it targets the weak); copper if it climbs.

Prevention

Mulch to stop soil splash; water the base, not the leaves; rotate Solanaceae; keep plants fed.

Months: not recorded

Plants

Tomato

Remedies

Not recorded — the field is blank rather than guessed.

The thing people get wrong

Not recorded — the field is blank rather than guessed.