of the rooms will be convei^ted to dry lime scrubbing than in New England 

 where caustic soda scrubbers are most common. 



At the Barden Orchards in South Haven, we saw a CA storage with 

 "pole-barn" type of construction. According to Dr. Don Dewey, Michigan 

 State University, the walls and ceilings of the rooms are insulated with 

 4 inches of Styrofoam, but the floors have no insulation. The insula- 

 tion is protected on the exterior wall by corrugated metal but is left 

 exposed on the interior side. The refrigeration in these rooms also is 

 unique in that the Hardens' utilized Krajnmer straddle units, which are 

 unitized completely and installed by hanging over the wall at the time 

 of erecting the storage. 



Storage operators in Michigan pay a $25 fee to the Michigan Depar't- 

 ment of Agriculture for each CA room. The minimum storage period, witli 

 not more than 5% oxygen, for certification as CA apples is 90 days for 

 all varieties, with the exception of the Jonathan, which has a 60 day 

 minimum storage period. 



Representatives of the Food and Standards Division of the Depart- 

 ment of Agriculture affix a seal to the door of each CA room at closing. 

 Whenever an interruption in the storage period occurs, this Department 

 must be notified within 48 hours after opening the room. Upon investi- 

 gation, the room may be resealed by an authorized representative of the 

 Food and Standards Division of the Department of Agriculture. However, 

 the rules and regulations governing CA storage state - - "The oxygen 

 level in any sealed controlled storage may exceed five (5) per cent for 

 an accujTiulated time, not to exceed ten (10) days (240 hours) during the 

 storage period. The storage period shall be increased to 100 days for 

 all fruit except Jonathans, which is seventy (70) days when the atmos- 

 pheric conditions have been interrupted." 



*************** 



POMOLOGICAL PARAGRAPH 



William J. Lord 

 Department of Plant and Soil Sciences 



Russet of Golden Delicious - During a visit with Dr. Arthur E. Mitchell, 

 Michigan State University, he stated that Golden Delicious are most sus- 

 ceptible to pesticide injury and subsequent russeting from pre-pink to 

 5 weeks after bloom and that this variety is most susceptible at petal 

 fall. To reduce russet, he suggested a cap tan or thylate fungicide pro- 

 gram from pink to 5 weeks after bloom and to delay the use of insecti- 

 cides until first cover. And, at that time, Guthion should be the only 

 insecticide used. 



