Control recommendations can be found in the Georgia Pest Control Handbook. Be careful to observe all safety precautions and harvest intervals. Cold and Wind Damage Cold damage may appear as a discoloration of the foliage, wrinkling of the leaf tissue or, in severe cases, actual wet spots where the cells have ruptured due to ice formation. Susceptibility to cold is determined by variety and cultural practices, especially fertilization. Heavy nitrogen fertilization can make onions more susceptible to cold injury.
Adequate potassium helps onion plants better withstand injurious cold.
A silver streak on one side of the onion foliage is good evidence of wind damage. Wind damage is often associated with abrasion caused by wind-blown sand particles. Plant small grain windbreaks every 10 beds to reduce this damage. Harvest Green onions are harvested when they reach the proper diameter for the particular market. This can be from 60 to 90 days after seeding, depending on the variety and the season.