ISTew York Agricultural Experiment Station. 



363 



damaged 75 per ct. of the pears in the well-known orchard of Mr. 

 Wright McCollum of Lockport and it was estimated that the loss 

 of fruit as a result of the attack was approximately one-half of the 

 crop. 



LIFE HISTORY AND HABITS. 



Hatching occurs during the period when the trees are coming into 

 blossom and until pollination is completed and the young fruits are 

 the size of filberts. During recent years the young nymphs have 

 appeared in greatest numbers at about the time when petals 



Fig. 38. — Pear Cluster Showing Early Injuries. 



began to drop. The newly-hatched forms (Fig. 3) are frail but 

 very agile creatures and seek the tender unfolding leaves which 

 they may puncture severely. With the second molt the nymph 

 is green in color, while the integument is tough and horny. In this 

 stage the insects are less active and remain quietly on foliage and 

 fruits for considerable periods of time. These nymphs are the first 

 to cause marked injuries to the fruit, which is in part explained by 

 their increased size and relatively sedentary habits. The principal 

 damage to pears is done in the month of May. During the first 

 two weeks in June the insects are mostly in the fifth or last nymphal 



