40 



BULLETIN 932, U. S. DEPARTMENT OP AGRICULTURE. 



THE THIRD GENERATION. 



Owing to the small number of moths of the second brood that were 

 reared at the insectary, data of the third generation were not se- 

 cured. The moths of the second brood deposited third-brood eggs 

 but none of these hatched. Complete data of the third generation, 

 however, were obtained in 1916 (see p. 75-78). 



CODLING-MOTH BAND STUDIES OF 1915. 



Two orchards were selected for banding purposes. The first of 

 these, known as the Edwards orchard, was unsprayed : it was located 

 about one-half mile west of the insectary. The second, or Hamilton 



Fig. 



12 - — Number of larva? of the codling moth collected from banded trees, Edwards 

 orchard, Grand Junction, Colo,, 1915. 



orchard, was well sprayed throughout the season, and was located 

 about 2 miles west and 3J miles north of the insectary. Certain 

 trees in each orchard were scraped to remove the loose bark on the 

 trunk and larger limbs and were then banded with a strip of burlap 

 cloth, folded to three thicknesses, having a width after folding of 

 about 5 inches. These bands were removed every three days with 

 one exception in both orchards when the interval was four days. The 

 larvae of each collection were kept separate and were allowed to spin 

 up in corrugated pasteboard strips at the insectary for further 

 studv. 



