-6- 



alone. Thus we have demonstrated in both 1976 and 1978 that certain 

 surfactants may increase the effectiveness of Promalin and adjustment 

 of the solution pH appeared to be of additional benefit. Since Pro- 

 malin is a rather expensive product, we feel that the addition of a 

 surfactant to the Promalin spray may allow growers to apply less 

 Promalin per acre or get an enhanced response from that which would 

 normally be applied. 



Other Observations Warm weather prevailed during the bloom period 

 in 1978. Fruit elongation with an enlargement of the calyx end was 

 apparent 3-4 days after Promalin application. It is not necessary to 

 wait until harvest to determine if Promalin caused increased fruit 

 length in your orchard. Calyx elongation and enlargement is perhaps 

 most pronounced 1-2 weeks after Promalin application. 



The L/D ratio of fruits will vary considerably on a tree. This 

 is due to the location of the fruit on the tree and their origin 

 within the blossom cluster. The L/d ratio distribution of fruits 

 from untreated and Promalin- treated trees is similar (Figure 1). 



I .00 

 L / D RATIO 



Figure 1 



The L/D ratio distribution of fruits from Promalin- treated 

 trees and control trees. 



