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Tell-tale sign is the blackening of the stems at and below ground level. The leaves turn y

...d border, giving the appearance of a different disease. The distinguishing sign on older spots is the presence of small, black, specklike fruiting bodies c Apply a broad-spectrum fungicide at the first sign of [[foliar]] infection.<ref name="ontario"/>

Destroy infected plants at the first sign of symptoms before leaves touch adjacent plants. Infected seeds and [[tuber

The first sign of an attack from allium leaf miner is the presence of the adult fly, which

...debris immediately after harvest. Apply a recommended bactericide at first sign of [[:Category:Disease|disease]]. Tank-mix the recommended bactericide with

Apply at the first sign of disease and rotate with chlorothalonil, maneb, or cupric hydroxide after Apply at the first sign of disease and alternate with chlorothalonil, maneb, or cupric hydroxide af

...or use at any point. If left longer the plant will begin to grow taller; a sign that it is preparing to [[bolt]], it should be cut and used immediately.