-7- 



2. Those which are exempt when used in accordance with good agricultural 

 practices such as Bordeaux mixture. 



3. Those for which a zero tolerance has been established such as T.E.P.P. 

 In other words, no trace of these materials is allowed on the fruit, 



4. Those for which a tolerance has been established. For apples the tolerance 

 for materials commonly used falls within the range of 0.25 parts per million 

 for aldrin and dieldrin to 20 parts per million for captan. 



While no practical means is available to the fruit grower to determine the 

 amount of residue remaining on his fruit at harvest time, he can be reasonably sure 

 that his fruit does not exceed the tolerance if he follows explicitly the instruc- 

 tions on spray material containers and those prescribed in official spray charts. 



— 0, C. Roberts 



I I I 11 I I I I I I I I I I I 



TRANSFER OF RED STELE TO STRAWBERRY LAND 



It has been recognized for some time that soil with no red stele history may 

 become contaminated through drainage water from an infected field at higher 

 elevation. Recently Michigan has reported two other sources of contamination which 

 might not occur to most growers; (1) plants of red stele resistant varieties 

 gro^m in infected soil may carry red stele spores in soil particles adhering to 

 their roots, and (2) the fine rootlets of some red stele resistant varieties may 

 be attacked by red stele and thereby carry the disease to clean land if such 

 plants are used for starting a new bed. 



---A. P. French 



I I I f I I I I I I I I I I I I 



REPEAT BLOOM 



In one block of Mcintosh apple trees in the University orchard a high percent- 

 age of spurs that bore fruit in 1956 bloomed again this year. Last fall the 

 writer tagged on each of 5 Mcintosh trees 25 spurs bearing one apple and 12 spurs 

 bearing two apples. In addition, 25 non-bearing fruit spurs were tagged on each 

 tree. The table below shows the tree yields in 1955 and 1956 and the percent 

 of repeat bloom on spurs bearing in 1956. 



