Bacterial Leaf Scorch of Blueberry

 

Bacterial Leaf Scorch
Scorch symptoms (late summer) observed
on plants infected with Xylella fastidiosa.
Photo courtesy of University of Ga. CES.

The bacterium Xylella fastidiosa is the causal agent of bacterial leaf scorch of blueberry, which primarily affects cultivars of southern highbush blueberries(interspecific …

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 …

Armillaria Root Rot of Blueberry

 

Armillaria Root Rot
A plant infected with Armillaria Root Rot.
Photo courtesy of NCSU Cooperative Extension Service.

Armillaria root rot (Armillaria mellea, A. ostoyae) is a rare disease of blueberries in the United States, but it can cause serious damage where …

Stem Blight of Blueberry — Control

 

Botryosphaeria dothidea
Cross-section of blueberry stem
showing brown discoloration
caused by the fungus
Botryosphaeria dothidea.
Image courtesy of NCSU CES.

 

The control of stem blight depends on cultural practices; fungicides do not provide adequate protection.

Having a clean planting stock is the …

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 …

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