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HEAT CANKER - BROADLEAF CROPS
In severe cases, heat canker causes a constricted area that completely girdles the base of the plant at the soil line. This can lead to a toppling over of the plant at that point. Broadleaf crops such as mustard, canola and flax are often killed. Newly emerging plants are more susceptible.
Before treating the fields for insects and herbicides assess the stand loss and be sure sufficient plants remain for economic yields. Canola, mustard and flax all compensate for reduced stand by more branching. Less than 50% stand will require extra care in weed control and other management to give good yields. Normal stands of flax should be about 70 plants per square foot. Canola and mustard should have 20 plants per square foot at normal seeding rates.
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