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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Garlic > Leaves yellow then wilt

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Garlic > Leaves > Leaves yellow then wilt

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  • Image: Fusarium Basal Rot 1
  • Image: Fusarium Basal Rot 2

Fusarium basal rot
Fusarium oxysporum f.sp. cepae

  • Leaves turn yellow to brown from the tip down and wilt
  • Red to purple discoloration may be seen on bulbs early in the season
  • Bulb has watery brown decay starting at the base and extending up into the bulb
  • A white fuzzy growth can often be seen on the rotted basal plate
  • More information Fusarium Basal Rot
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  • Image: Penicillium Decay

Penicillium decay
Penicillium hirsutum

  • Young plants are stunted, yellow, and wilted
  • Infected cloves rot before emergence, resulting in poor stand establishment
  • Plants remain weak and thin throughout season
  • Cloves have a blue-green fuzzy fungal growth
  • More information on Penicillium Decay
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  • Image: : Bot Leaf Blight 2

Botrytis neck rot
Botrytis porri

  • Outer leaves yellow and die back, in severe cases the entire plant dies
  • Stem (neck) appears water soaked at the soil line
  • Small, hard, black fungal structures form in the decayed stem tissue
  • Rot may extend into the top of the bulb in severe cases
  • Disease is common in cool wet weather or in heavy wet soils
  • More information on Botrytis Neck Rot
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  • Image: White Rot 1
  • Image: White Rot 2

White rot
Sclerotium cepivorum

  • In severely infected plants, leaves may be stunted, yellow from the tip down, and die
  • Bulb is soft and rotten from the base up
  • Bulb has white, fluffy fungal growth
  • Small, hard, black poppy seed like fungal structures form on infected bulbs
  • Roots may be rotten or completely rotted away
  • More information White Rot
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  • Image: Onion Maggot 3
  • Image: Onion Maggot 1
  • Image: Onion Maggot 2

Onion maggot
Delia antiqua

  • Plants yellow and wilt, sometimes rapidly
  • Holes in bulbs are present
  • Maggots may be present; they are carrot-shaped, legless, and cream colored
  • More information on Onion Maggot
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  • Image: Pink Rot 1

Pink root
Phoma terrestris

  • Leaves turn yellow with a reddish tinge from the tip down due to root damage
  • Sunken dark pink to maroon areas on roots
  • Infected roots break off easily
  • Plants are stunted and may produce no to very small bulbs
  • Commonly occurs mid to late season, in areas with poor soil
  • More information on Pink Root
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  • Image: Nitrogen Deficiency

Nitrogen deficiency

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  • Image: Stem and Bulb Nematode 1

Stem and bulb nematode
Ditylenchus dipsaci

  • Base of stem (neck) of plant is soft, eventually wilts
  • Plants appear distorted
  • Plants are stunted with shortened and thickened leaves
  • Bulbs are often desiccated and light weight, secondary rot organisms like soft rot may invade and rot the bulb
  • More information on Stem and Bulb Nematode

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