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Garlic

General Garlic Diseases and Pest Management

Onion Disease Guide - A Practical Guide for Seedsmen, Growers and Agricultural Advisors. Published by Seminis Vegetable Seeds, Inc.’s Plant Health Department (covers onion and leek; mentions garlic).

Problems of Stored Garlic. Oregon State University Plant Clinic.
 

Diseases

Disease: Basal rot
Pathogen: Botytis allii and Fusarium roseum

Basal rot on onion.

Photo Source: G.Q. Pelter

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Garlic (Allium sativum) – Basal Rot ;

Onions, Garlic: Basal rot, Washington State University Hortsense

Common name: Embellisia skin blotch and bulb canker of garlic
Latin binomial: Embellisia allii
Host plants: Primarily garlic. Skin blotch is the most common symptom caused by this fungus, and usually is a cosmetic blemish on the outer skin layers of garlic that does not affect consumer appeal unless sufficiently developed. Bulb canker consists of corky masses, primarily on the top or sides of individual cloves. If the first true leaf of a garlic seedling becomes infected, the leaf may be curled.

Embellisia skin blotch and bulb canker of garlic.
Photo Source: Lindsey du Toit, Washington State University

Online Resources:

https://plant-pest-advisory.rutgers.edu/skin-blotch-in-garlic/

Oregon State University Extension Bulletin on Embellisia Skin Blotch (PDF)

Common name: White rot
Latin binomial: Sclerotium cepivorum
Host plants: Garlic, onion, and other Allium spp.

	Sclerotia (small, black, pinhead-size dormant structures) produced by the white rot fungus, along with white mycelium attached to infected garlic cloves.
Photo Source: Karen Ward, Washington State University Plant Diagnostician	Photo Source: Bruce Watt, University of Maine

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Garlic (Allium sativum) – White Rot