Apr. 1. 1918 Laspeyresia Molesta 65 



L. prunivora works in apple, causing injury to fruit almost identical 

 with that caused by L. molesta (PI. 7, A) ; it does not injure twigs. Speci- 

 mens of larvae were not available for comparison. Superficially they 

 appear the same as L. molesta. 



Anarsia lineatella attacks peach twigs, causing injury identical with 

 the spring injury of L. molesta (PL 5, A). The larva is most readily 

 separated from L. molesta by the setal plan of the ninth abdominal seg- 

 ment, which should be compared with that shown in Plate 8, D. In 

 Anarsia lineatella seta I is not approximate to seta III, being farther 

 from or at least as far from seta III as from seta II; the frons extends 

 almost to the incision of the dorsal hind margin; the longitudinal ridge 

 is extremely short; setae P^ and Pj and puncture Pb lie in a line; P, is 

 well behind the level of Adfj. 



Laspeyresia pyricolana attacks the twigs of apple, boring out the 

 center and killing the tip. The injury resembles that of L. molesta on 

 apple twigs. No specimens were available for comparison. 



LIFE HISTORY AND HABITS 



The following data on the life history of Laspeyresia molesta are based 

 on material collected chiefly at the United States Department of Agri- 

 culture experimental farm near Rosslyn, Va., and reared in the insectary 

 at the Bureau of Entomology, Washington, D. C, during the season 

 of 1 91 7. The insectary provides practically outdoor conditions where 

 insects may develop normally. 



SPRING EMERGENCE AND OVIPOSITION 



In mid-March hibernating larvae pupate and about mid- April, or when 

 peaches are in full bloom, the first adults emerge, their emergence con- 

 tinuing through the first three weeks of May. The time elapsing between 

 emergence and the beginning of oviposition, called the preoviposition 

 period, ranges from 2 to 12 days and averages 5 days. In 191 7 the first 

 eggs were found in a peach orchard on May 3. Normally the eggs are 

 deposited singly on the under side of the leaves, and in the orchard they 

 were not found in any other place. In glass rearing jars an occasional 

 egg was deposited on the upper surface of the leaf, and in one case four 

 eggs were found on the bark of a peach seedling confined in a rearing 

 cage. The moths oviposit much more freely on the smooth glass surface 

 of the battery jar and lantern globe rearing cages than on peach foliage 

 placed in the jar; hence eggs used for study were those deposited on the 

 glass of the rearing cages. 



The deposition of eggs began May 2 and continued until late in the 

 fall. The last egg observed was found October 8. At this time develop- 

 ment had proceeded far enough to show the eye-spots in the embryo. 



