Scab
Cause:
Bacteria
Symptom:
Brown-yellow circular lesions on roots; sunken, cracked lesions which
maybe irregular in shape .
Scientific Name: Streptomyces scabies
Management:
Management
of scab is very difficult; Rotate crops to non-host for four years; Maintain a
high level of soil moisture; Avoid increasing soil pH through soil amendments.
Cause:
Fungus
Symptom:
Small black-blue areas on roots which expand and girdle taproot; roots become
constricted at site of lesions; black discoloration extends into root.
Scientific Name:
Management:
Plant
resistant radish varieties; rotate crops with non-brassica species.
White
Rust
Cause:
Fungus
Symptom:
White pustules in cotyledon, leaves, stems and/or flowers in which coalesce to
form large areas of infection; leaves may roll and thicken.
Management:
Rotate crops; plant only disease-free seed;
apply appropriate fungicide if disease becomes a problem.
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