Leaf Rust of Blueberry

 

Rust
Rabbiteye cultivars suffer from pre-
mature defoliation that appears
to be caused by a rust fungus,
tentatively identified as
Pucciniastrum vaccinii (Synonym P.
myrtillus). Photo courtesy of
NCSU Cooperative Extension Service.

Leaf rust, caused by the rust fungus, Pucciniastrum vaccinii …

Alternaria Leaf Spot of Blueberry

 

Alternaria leaf spot in blueberries
 

Alternaria Leaf Spot (Alternaria tenuissima) occurs primarily in the spring during prolonged periods of cool wet weather, when spores are produced in abundance. In most cases only lower leaves are affected; however, instances do occur when severe infection completely defoliates …

Double Spot and Gloeocercospora Leaf Spot

Dothichiza caroliniana and Gloeocercospora inconspicua

In late summer, the double spot fungus develops a secondary necrotic area around the original lesion spreading in an irregular to fan-shaped pattern. The gloeocercospora leaf spot appears on the foliage by mid-summer as large …

Powdery Mildew of Blueberry

 

Powdery Mildew
Yellow to black fruiting
bodies (cleistothecia) form on infected
leaves. Photo courtesy of
NCSU Cooperative Extension Service

The powdery mildew disease usually does not develop on blueberry leaves until midsummer after the crop is harvested.

Symptoms:

  • A white fungus growth

Septoria Leaf Spot of Blueberry and Grape

 

Septoria Leaf Spot
The septoria leaf spot fungus overwinters
in infected leaves on the ground
and in stem lesions.
Photo courtesy of NCSU Cooperative
Extension Service.

 

Symptoms:

  • Small to medium brown leaf spots with purplish margins.
  • Lesions on succulent green stems.
  • Premature defoliation