EXPERIMENT STATION BULLETINS. 



449 



By the middle of June the nymphs of the second summer brood were 

 present in large numbers and were causing serious injury to the foliage. 

 This condition prevailed in Block A which had received the dormant appli- 

 cation for the hibernating adults in addition to the applications made on 

 Block B. The smaller number of eggs in Block A early in April was not 

 reflected in a less serious infestation in June as the nymphs were present 

 apparently in about equal numbers in both blocks. 



This condition indicates that the fall application was really of little value 

 in this instance for which there are two probable reasons. First, there were 

 as many eggs escaped injury from the application of strong lime-sulphur in 

 Block A as in Block B, and second, there were probably equal numbers of 

 eggs deposited in both blocks by belated females. 



Summer applications. Several material^ and combinations of materials 

 were used from June 18 to 22 to kill the nymphs of the second summer brood. 

 They were as follows : 



1. Black Leaf 40 1 pint 

 Hydrated lime 20 pounds 



2. Black Leaf 40 1 pint 

 Casein 2 ounces 

 Hydrated lime 6 ounces 



3. Black Leaf 40 1 pint 

 Whale oil soap 3 pounds / 



4. Hydrated hme 20 pounds 100 gallons water 



100 gallons water 



100 gallons water 

 100 gallons water 



Fig. 7. — A view in Orchard No. 1 in which control was not satisfactory. The trees were practically 

 defoliated in early September. This orchard received the dormant application for hibernatmg adults, 

 the delayed dormant for the eggs and a caly.x application for nymphs. Picture taken in September, 

 1921. 



