Limit the life of an infested stand to 4 years. Clean equipment before moving from infested to clean fields. Spring Frost Frost damage. New growth in the spring is often subject to frost damage, particularly after a period of mild weather. Damage may occur to whole plants, or only to the top leaves.
Frozen tissue appears water-soaked.
Tolerance of leaves to frost varies among varieties and individual plants, and is not always related to winter hardiness. Alternate freezing and thawing in early spring cause the soil to expand and exert upward pressure on the plant crown. The tap root will often break 5 to 10 cm below ground level. Poorly established or late-seeded crops are most susceptible to heaving injury. Plant early so that plants are well established by fall.