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Strawberry

Nursery Pest Problems

On this page
  • Spider mites
  • Cyclamen mite
  • Anthracnose
  • Angular leaf spot
  • Botrytis rot
  • Powdery mildew

Monitor the nursery during the last month before digging for pest problems that may be introduced to fruit-production fields on contaminated transplants. Names link to more information on identification and management.

Click on photos to enlarge

Twospotted spider mite damage
Twospotted spider mite damage
Identification tip: Yellow stippling and discoloration of foliage. Infestations usually not heavy enough to cause visible symptoms.

Twospotted spider mite adult and immatures
Twospotted spider mite adult and immatures
Identification tip: Moving dots on the undersides of leaflets. With hand lens: yellowish, pale green, or orange; dark blotch on each side; two red eyespots on head; eggs spherical.

Carmine spider mite
Carmine spider mite adult
Identification tip: Similar to twospotted spider mite in size and shape, but deep red; dark blotch on each side.

Cyclamen mite damage
Cyclamen mite damage
Identification tip: Stunting and distortion of new leaves; compact mass of crinkled leaves in center of plant.

Cyclamen mote adults and eggs
Cyclamen mite adults and eggs
Identification tip: Invisible to naked eye. With 20X hand lens: teardrop shaped; tiny legs toward one end; eggs oblong.

 

Anthracnose runner lesions
Anthracnose runner lesions
Identification tip: Sunken, dark brown lesions on stems, runners, leaf petioles.

Anthracnose damaged plant
Anthracnose damaged plant
Identification tip: Wilted, collapsed plants.

Anthracnose crown discoloration
Anthracnose crown discoloration
Identification tip: Red-brown discoloration in crown tissue of wilted plants.

Angular leaf spot lesions
Angular leaf spot lesions
Identification tip: Watersoaked lesions on underside of leaf, delimited by leaf veins; dark, viscous fluid on surface of lesions.

Angular leaf spot coalesced lesions
Angular leaf spot coalesced lesions
Identification tip: Reddish brown spots and patches on upper leaf surface.

 

Botrytis blossom blast
Botrytis blossom blast
Identification tip: Brown, withered blossoms; gray tufts of pathogen spores.

Botrytis early fruit lesion
Botrytis early fruit lesion
Identification tip: Light brown spots or patches on fruit, often near calyx.

Borytis sporulation
Botrytis sporulation (gray mold)
Identification tip: Velvety gray pathogen spores on surface of rotting fruit.

Botrtis R
Powdery mildew damage
Identification tip: Leaf edges curled upward; purple discoloration of leaf margins.

Powdery mildew sporulatoin
Powdery mildew sporulation
Identification tip: Powdery white patches on underside of leaves.

 

 

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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