Apple. Anthracnose. Effective. By Arthur Frank, Plant Pathologist Western Washington Experiment Station, Puyallup, Washington The above are the results of but one seasona#39;s work, ... If, however, the vents are left open both day and night all advantage of the cool night air is lost during the day. This is ... This will allow much less warm air to enter the storage room than would come through a large door.