Diseases and Pests of Garlic 4/12 Botrytis Neck Rot of Garlic

Diseases and Pests of Garlic 4/12 Botrytis Neck Rot of Garlic (caused by Botrytis porri)

Botrytis neck rot causes frequent and significant losses to garlic. First symptoms appear in spring or early summer in the form of water-soaked neck rot near the soil line. After infecting the pseudostem, the fungus grows downward towards the bulb attacking the inner axis and leaving the exterior asymptomatic at first. After curing, the outer wrappers of affected bulbs often display an intense purplish discoloration and deterioration. The inner wrappers may at this point become hardened brown or black.

Neck rot may persist through storage developing grey mold and large black sclerotia, as opposed to the poppy-seed-sized sclerotia of white rot.

Botrytis porri lives in virtually all soils and particular weather patterns determine its impact from year to year. Cool and wet conditions in late spring or early summer favor the disease which naturally dies at temperatures above 30 degrees C. Management strategies include

culling diseased plants,
avoiding excess mulch and irrigation,
creating good air circulation in field and storage,
promoting speedy drying by cutting off the stems right at harvest time rather than after curing and spreading out harvested, neck-trimmed garlic bulbs in trays rather than hanging them in bundles.

Recently, a preventative cure for Botrytis has been proposed to us by BioFert Manufacturing Inc., a subsidiary of TerraLink. The following recipe treats 7,500 square feet:

To 4 gallons of water add:

2 tablespoons of liquid dish soap
300 grams potassium bicarbonate (available from BioFert)
75 milliliters of BioFert’s RapiGro, a seaweed extract.

Mix thoroughly and spray (fog) plants every two to three weeks, starting at emergence, and making sure to apply enough liquid so that some drips down the neck to the soil line.

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