Skip to Main navigation Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Garlic > Undersized or no bulb developed

Print Icon Email Icon Share Icon

Garlic > Clove/bulb > Undersized or no bulb developed

1 of 5
  • Image: Nitrogen Deficiency

Nitrogen deficiency

2 of 5
  • Image: Nitrogen Deficiency
  • Image: Nitrogen Deficiency
  • Image: Nitrogen Deficiency

Garlic rust
Puccinia alli

  • Small bright orange spots on leaves and stems
  • Black spots develop on the edge of orange spots
  • If many leaf spots occur, leaves wilt, turn yellow, dry out
  • Bulbs are small, poor quality, and may lack outer dry skin
  • More information on Garlic rust...
3 of 5
  • Image: Pink Root

Pink root
Phoma terrestris

  • Plants are stunted and may produce no to very small bulbs
  • Sunken dark pink to maroon areas on roots
  • Infected roots break off easily
  • Leaves turn yellow with a reddish tinge from the tip down due to root damage
  • Commonly occurs mid to late season, in areas with poor soil
  • More information on Pink Root ...
4 of 5
  • Image: Yellow Dwarf Virus 1
  • Image: Yellow Dwarf Virus 2

Onion yellow dwarf virus
Trichoplusia ni

  • Bulbs fail to form if plants are infected when young or are firm but small when infected later in the season
  • First see yellow streaks at the base of young leaves
  • Eventually all leaves show yellow streaking to complete yellowing
  • Leaves are crinkled, flattened and fall over
  • Disease spread by the green peach aphid
  • More information on Onion Yellow Dwarf Virus ...
5 of 5
  • Image: Downy Mildew 1
  • Image: Downy Mildew 2
  • Image: Downy Mildew 3

Downy mildew
Peronospora destructor

  • Plants may produce small bulbs if leaf infection is severe
  • Leaves develop elongated pale green to tan spots
  • Purplish gray fuzzy growth develops on leaves
  • Severely infected leaves collapse and die
  • Disease is most severe in cool wet weather
  • More information on Downy Mildew ...

Don't see what you're looking for?

  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy