180 B. C. Entomological Society 



tivity prevented the taking of more ample notes on the places chosen for 

 oviposition, and the size of the egg precluded extended obsravtions in 

 the field. 



Appearance of Second Generation Larvae 



In 1918 the first small larvae of the second generation were observed 

 first, at Kaleden, on apricots on June 19th. The terminal leaf cluster was 

 attacked much in the same way as the earlier spring damage was accom- 

 plished. In this same orchard larvae 4 mm. long were taken on June 27th. 

 They had burrowed down two inches into the central pith of the stem 

 and had caused the terminal growth to wilt. Other larvae, entering the 

 stems at leaf axils, burrowed in, but frequently withdrew to attack the 

 tips of the growing twigs, where surface tissue is fed on to some extent 

 before entering and burrowing down the central pith, where they were 

 commonly found. On July 10th, larvae '< mm. in length were found, and 

 on July 16tli some 10 mm. long. In August larvae in all stages of gi'owth, 

 from 3 mm. to 12 mm., were common. Fruit was attacked much in the 

 same way as formerly noticed, the larvae frequently gaining entrance 

 near the stalk. Clustered peaches were often found attacked. Fruit thus 

 entered would he completely hollowed out, showing a large cavity within 

 and a minute entrance hole. The attack on mature fruit is probably 

 the only really serious form of injury caused, as it renders it un- 

 marketable. 



In 1919 all larvae seen between June 6th and 16th were full grown. 

 There was then a lapse of fully five weeks, in which period it was prac- 

 tically impossible to find any larvae of any kind and none at all on the 

 particular trees which were under continuous and careful surveillance. 

 On July 14 minute larvae 3 to 5 mm. in length were common. Hence 

 field data supports our la))oratory rearing that the larvae found during 

 July and August arose from moths which liad developed from over- 

 wintering larvae. On August 30th, in 1919, nearly all the larvae found 

 in the orchards were full grown. During the first two weeks of Septem- 

 ber, minute larvae were again apparent, which, from our laboratory 

 rearing notes, were the progeny from the autumn generation of moths. 

 These small larvae formed hibernacula. The field notes of injury show 

 no material variation in habits to that already evidenced by the spring 

 larvae. It was noticed, liowever, that the percentage of larval injury 

 to fruit was greater than the injury to twigs. 



Second Generation and Moth Emergence 



Collections of larvae taken between August 1st, and 27th, 1918, 

 varied in size from 3 mm. to 10 mm. These were bred through under 

 normal insectary conditions, using a small cage over a young peach tree. 

 Pupation followed, and moth emergence took place between August 19th 

 and October 1st. The height of the flight season occurred in tlie middle 

 of August. The lengtli of the pupal period again lasted about 14 days. 



