In the present investigation opportunity was afforded to study 

 further the importance of spore population in the initiation of decay. 

 The data in figure 3 indicate that one of the critical factors in the 



H"! LENTICEL INFECTIONS 

 ■■ TOTAL INFECTIONS 



T — TIETON ORCHARD 

 LN— LOWER NACHES ORCHARD 

 NH-NACHES HEIGHTS ORCHARD 

 SH- SELAH HEIGHTS ORCHARD 

 WH-WILEY HEIGHTS ORCHARD 



1939-40 



Z M J Z l z 



■ J 



UJ UJ 



z z 



o o 



2— z 



I 



I 



UJ UJ' 



z z 

 o o 

 z z 



25 

 20 

 15 

 10 

 5 



LN NH SH \ 

 CLEAN WASH 

 ( FRUIT DIPPED 

 IN SPORE BATH ) 



T LN NH SH WH 

 CONTAMINATED ACID 

 (FRUIT NOT DIPPED 

 IN SPORE BATH ) 



T LN NH SH Wl 



CLEAN WASH 



( FRUIT NOT DIPPED 



IN SPORE BATH ) 



"940-41 



i 



Uj UJ U) LU 



z z z ^ 



o o o o 



z_ z -z. z, 



_cJ| 



UJ UJ 



z z 



o o 



z z: 



T LN NH SH WH 

 CLEAN WASH 

 ( FRUIT DIPPED 

 IN SPORE BATH ) 



T LN NH SH WH 

 UNWASHED FRUIT 



DIPPED 

 IN SPORE BATH 



T LN NH SH WH 



CLEAN WASH 



( FRUIT NOT DIPPED 



IN SPORE BATH ) 



Figuee 3. — Effect of blue mold spore population on infections in Delicious 

 apples from five orchards. Washing was done at harvest in a dual-process 

 machine containing sodium silicate (80 pounds to 100 gallons) at 110° F. and 

 1.5-percent hydrochloric acid at 100°; it was followed by a rinse of clean water 

 and in some instances by an immersion in a spore suspension. All lots were 

 packed immediately after treatment and stored at 32° until the following 

 March. 



13 



