Flax Flashcards
major diseases of FLAX
rust, fusarium wilt, mildew, blight, seed rot, aster yellows, chlorosis
FLAX RUST
yellow, orange, urediospores
Pustules turn black in fall, telispores
overwinters on stubble
no need for alternate host
Flax rust effects
leaves, stem, bolls
Control of FLAX RUST
2 year crop rotation
incorporate stubble
use clean seed
Flax WILT
Soil borne
vascular tissues
survives indefinitely
frequent cropping will help inoculum build up in soil
Control of flax WILT
resistant cultivars
crop rotation- 3 years
clean seed
seed treatment
Pasmo in FLAX
brown spots on levaes brown bands on stem black fruiting bodies shrivelled seed overwinters in debris spores rain splashed ascospores and conidia
Control of PASNO (septoria) in FLAX
resistant CV's crop rotation 3 years clean seed seed treatment control weeds proper seeding rate
Powdery Mildew in FLAX
air borne white mycelial mass high humidity shrivelled seed pre mature rippening
Conidia in Flax
Perithecia in flax
Asexual spores.
Not observed in western CND
high humidity and warm weather
Control of powdery MILDEW in FLAX
Most Canadian CV moserate resistance
Resistant CV
early seeding
clean seed
Alternaria blight in FLAX
Control?
stubble borne sed borne
rain and lodging
Control
- destroy crop reside
- crop rotation
- seed tretament
Sclerotinia Stem Rot in FLAX
Accociated with lodging could cause epidemics infection on senescent tissue stress plants bleached stem, sclerotinia inside
Management sclerotinia in FLAX
avoid water logged fields
crop rotation
avoid previous sclerotinia fields
Anthracnose in FLAX
Seedling Blight Stem crankers splashing rain helps spores warm weather increases disease over winters on stubble Conidia
