PEST
|
BRIEF DESCRIPTION
|
DAMAGE/REASON FOR CONCERN
|
MONITORING APPROACHES
|
DECISION POINTS/ TOLERANCE
|
MANAGEMENT OPTIONS
|
FOLLOW UP
|
Spur
Blight |
Brown irregular shaped lesions on fruiting
laterals. 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 leaves and weaken buds. Increases
susceptibility to winter injury. |
Continue to examine foliage for spur blight
lesions and lower primocane area for cane lesions. |
Consider field history - past incidence
of infection. Wet weather during harvest increases likelihood
of continued infection of new canes. |
Optimum timing for chemical control is prior
to and during early bloom. |
Examine primocanes for purplish lesions
in late harvest. |
|
Botrytis
Fruit Rot |
Botrytis infection of blossoms not easily
seen. Gray powdery spores form on rotting berries. Disease
Cycle |
Reduces fruit quality and yield. Spores
from fruit infection can infect and weaken cane tissue. |
Examine fruit for gray mold. |
Disease prevention strategy. |
Presence of diseased fruit may
indicate need for fungicides during harvest period. Avoid
excessive overhead irrigation. Pick fruit frequently as
it ripens. Avoid excessive canopy. |
Examine fruit and canes during harvest. |
|
Cane
Blight
|
Fruiting canes are weak/brittle at catcher
plate level. The fungus only enters canes through wounds.
Primocane wounds during harvest allow for infection.
Disease
Cycle
|
Infection of new canes allows fungus to
carry over to following season. |
Examine primocanes for evidence of damage
from catcher plates. Current season infection cannot
be seen until later in the fall. |
Catcher plate damage to primocanes. History
of infection. |
Adjust catcher plates on mechanical
harvesters to minimize wounding and subsequent infection.
Fungicide application directed to base of primocanes to
protect wounds. |
Check lower primocane buds for infection
in the fall. |
|
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. |
Damage seen as collapse of fruiting laterals,
wilting primocanes with onset of hot weather. Reduced
vigor and yield. |
Note areas in field where these
symptoms are seen. Decline can be extreme during harvest.
Examine roots and crown from suspect areas to confirm root
disease. If left untreated, the areas with weak or dying
plants will enlarge from year to year. |
History of root rot problems.
Consider varietal susceptibility and area and degree of
infection. |
No controls available during harvest. Sample
suspect areas to confirm infection. Samples need to be
tested by a qualified lab to confirm the presence of
the pathogen. |
Treat infected areas in the fall. |
