PEST
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BRIEF DESCRIPTION
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DAMAGE/REASON FOR CONCERN
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MONITORING APPROACHES
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DECISION POINTS/ TOLERANCE
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MANAGEMENT OPTIONS
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FOLLOW UP
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Spur
Blight
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Brown wedge shaped lesions on primocane
leaves. Petiole left attached to primocanes. Dark brown
area on cane around bud may be present.
Disease
Cycle
|
Can damage/weaken buds. Increases susceptibility
to winter injury. |
Continue to examine foliage for wedge-shaped
lesions and lower primocane area for cane lesions. |
Disease prevention strategy. Consider field
history - past incidence of infection. |
Spraying at this crop stage is too late
for good control. |
Rate disease incidence on primocanes now
or following spring. |
Cane
Blight |
Primocane wounds during harvest are sites
for infection. Brown to black lesions develop on new
infected canes. Disease
Cycle |
Infection of new canes allows fungus to
carryover to following season.
|
Examine primocanes for evidence of damage
from catcher plates. Scrape off bark on primocanes near
catcher plate wounds in late fall/October. Diseased canes
will have a reddish, spreading, vascular lesion. |
Catcher plate damage to primocanes.
History of infection.
|
Fungicide application directed
at base of primocanes.
|
Monitor closely in late fall
and following spring.
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Yellow
Rust
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Black teliospores replace the orange-yellow
spores on the underside of leaves. |
Teliospore stage allows the fungus to overwinter. |
Inspect leaves for presence of teliospores
and degree of infection. |
Presence of teliospores. Identify fields
with moderate to heavy degree of infection. |
Delay tying canes in infected
fields until leaves have dropped, if practical. Cultivate
leaves that have dropped into the soil to reduce carryover
inoculum. |
Monitor closely next spring.
|
Phytophthora
Root Rot |
Soilborne fungus which can cause
root and crown rot. Infection favored by saturated soil
conditions. Diseased plants have lack of feeder roots,
poor vigor canes. Interior of major roots and crown are
brown to black. |
Fruiting canes are dead. Primocanes
may wilt or die.
|
Note areas in field where these
symptoms are seen. Decline can be extreme during and after
harvest. Examine roots and crown from suspect areas to
confirm root disease.
|
History of root rot problems.
Consider varietal susceptibility and area and degree of
infection.
|
Sample suspect areas to confirm infection.
Cultivate so that water drains away from plants into
the center of the alleyway. Also subsoil down each alleyway
to improve the movement of water into the soil. This
can also be used to fracture compacted soil beneath equipment
wheel tracks. Apply fungicides within row in October
through early November where disease is confirmed as
cause of decline. |
Monitor diseased areas closely
next season.
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