76 BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



observation in the Yakima Valley, and the date of maximum hatching 

 varied 20 days. The date of earliest hatching of the second brood of 

 larvae also varied 11 days, while the date of maximum hatching varied 

 only 5 days. 



Newly hatched larvae, after finding an apple or pear, will crawl 

 about over it for some time before entering it. It requires an hour 

 or more for the larva to hide itself in the fruit, and most of the skin 

 is bitten off in small pieces and not eaten. If a larva fails to find a 

 fruit, it may burrow into the midrib of a leaf or a terminal shoot, but it 

 appears to be unable to maintain itself on this food. 



From 75 to 85 per cent of the first brood of larvae, and from less 

 than 1 per cent to nearly 2 per cent of the second brood of larvae trans- 

 form the same season, the others waiting until the following year. 



The egg parasite TricJwgramma minutum Riley has been observed 

 in the Yakima Valley, and the larval parasites Aenoplex plesiotypus 

 Cush. and Epiurus indagator Walsh were observed at Wenatchee. 

 Occasional evidence of predators was observed. 



