CoLOKADo Experiment Station 
:r2 
tliat are I'eady to enter any such wound on a healthy apple, so it is 
advisable to eliminate all apples showing the slightest sign of decay 
before putting the fruit in storage. 
If the apples ai‘e fancy stock and it is desired to keep them a 
long time, it will probably pay to Avrap each apple in a piece of 
clean paper. 
Since apples decay more rapidly at high temperatures it is well 
to store them in cool dry places. 
Black Mold (Alternaria sp.) (16) — A fruit rot which attacks the 
blossom end of ripe apples is common in Colorado and is often 
the source of much loss. The affected fruits show a dark broAvn 
sunken area at the base of the shriveled flower parts. The spots 
Apples affected with black mold. (Original in Bulletin 212, by Robbins.) 
may be scarcely noticeable at time of harvest but they increase in 
size in storage until the entire apple is ruined. Cars of fruit Avhich 
were apparently in perfect condition when shipped have shown as 
high as ten to twenty per cent of infected apples on reaching their 
destination. The Winesap seems to be particularly susceptible. A 
similar trouble has also been noted on Kieffer pears. 
No extensive experiments have been made to determine methods 
of control, but it is very probalile that if a fungicide spray was 
applied according to the plan recommended for other apple diseases, 
the loss would likely be reduced. 
Frost Injury — (17), (18) — Injury from low temperatures is an 
important factor in apjile growing. Frost injury may occur during 
