Cold-injured blueberry stems develop a characteristic dead, hook-shaped tip.
By Dr. Elina Coneva, Auburn University
The following article is prepared based on a synopsis of information provided by Dr. Phil Brannen (UGA), Dr. Gerard Krewer (UGA Professor Emeritus)…
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 …
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 …
Cross-section of blueberry stem
showing brown discoloration
caused by the fungus
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 …
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 (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 …
Gloeosporium Leaf Spot or Anthracnose
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.
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 …
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 …