Phomopsis twig blight, caused by the fungus Phomopsis spp. (including P. vaccinii), can be a serious disease if allowed to buildup in a blueberry planting. This disease is frequently more severe following winters characterized by excessive temperature fluctuations and …
Gloeosporium Leaf Spot or Anthracnose of Blueberry
Gloeosporium Leaf Spot or Anthracnose
can produce flecking, leaf anthracnose
and stem lesions. Photo courtesy of
NCSU Cooperative Extension Service
can produce flecking, leaf anthracnose
and stem lesions. Photo courtesy of
NCSU Cooperative Extension Service
Gloeosporium leaf spot can cause severe defoliation and reduction in yield of blueberry crops.
Symptoms include:
- Small reddish flecks on
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 …
Leaf Rust of Blueberry
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.
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 (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
The septoria leaf spot fungus overwinters
in infected leaves on the ground
and in stem lesions.
Photo courtesy of NCSU Cooperative
Extension Service.
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
Powdery Mildew of Blueberry
Yellow to black fruiting
bodies (cleistothecia) form on infected
leaves. Photo courtesy of
NCSU Cooperative Extension Service
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