32 



BULLETIN 189, U. s. DEPARTMENT OF AGRICULTURE. 



INVESTIGATIONS IN 1913. 



SPRING-BROOD MOTHS. 



Figure 18 represents the occurience of 60S moths of the spring 

 brood that appeared in the rearing cages at Fishers ville in 1913. 

 Moths emerged first on May 3 ; but maximum emergence was delayed 

 until May 30, the emergence curve in figure 18 for Fishersville being 

 very different in this respect from the spring-brood curve at Win- 

 chester, as it appears in figure 14. Adults continued to emerge until 

 June 27. (See also Table XXIV.) 



Table XXIV. — Emergence of spring-brood moths of the codling moth at 

 Fishersville, Va., in 1913. (See fig. 18.) 



Date of obser- 

 vation. 



Number 

 of moths 

 emerging. 



Date of obser- 

 vation. 



Number 

 of moths 

 emerging. 



May 3 



6 



1 



3 



9 



11 



53 



28 



94 



91 



124 



81 



June 5 



8 



44 

 10 . 



9 



22 

 10 



7 



3 



2 



• 6 



9 



11.::: 



12 



14 



15 



17 



18 



20 



21 



24 



24 



27 



27 



Total 



30 



608 









First-brood larvae were probably entering the fruit in the field by 

 May 10 to 13, from eggs laid by moths emerging May 1 to 3. 



On account of the light crop of fruit in 1913 the records at Fishers- 

 ville for the remainder of the season are of little value and are not 

 included in this report 



INVESTIGATIONS AT FRENCH CREEK, W. VA. 



DESCRIPTION OF LOCALITY. 



French Creek is located near the lower border of the Transition 

 Life Zone in a hilly region not far from the center of West Virginia. 

 Commercial apple growing is just beginning to attract attention, and 

 several orchards of considerable size are being planted in that general 

 locality. Bearing orchards of from 5 to 25 acres are not uncommon. 

 The orchards from which banding records were obtained are located 

 at an approximate elevation of 1,600 feet above the level of the sea. 



INVESTIGATIONS IN 1911. 



On June 19, 1911, 15 suitable apple trees in an orchard that had 

 never been sprayed were banded, but it was found that the bands 

 were placed too late in the season to obtain a complete record of the 

 time of emergence from the fruit of the first-brood larvae. The bands 



