42 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Figure 13 gives a graphic representation of the rate of emergence 

 of the moths of the first brood for the season of 1907. 



The most extensive record of the egg stage of the second brood 

 was secured in the season of 1907. Table XVIII gives the length 

 of this stage for 35 eggs, which shows an average of 6.5 days, the 



17 ZO 2J5 



August 



4- 7 10 13 



September 



FIG. 13.— Diagram showing the time of emergence of the first-hrood moths of the grape-berry moth in 1907, 



at North East. Pa. (Original.) 



minimum being 5 days and the maximum 9 days. This record 

 shows a shorter period than that secured for a smaller number of 

 eggs hi 1909 (see Table XII. which shows an average of 10.1 days, 

 a minimum of 9 days, and a maximum of 11 days). 



Table XVIII. — Length of incubation of second-brood eggs of the grape-berry moth, North 



East. Pa.. 1907. 



1 



No. Date— 



Days 

 of in- 

 cuba- 

 tion. 



No. 

 of ob- 

 serva- 

 tion. 



Date — 



Days 

 of ih- 



No. 

 of ob- 



Date- 



Days 

 of in- 

 cuba- 

 tion. 



serva- 1 

 tion. Laid. , Hatched. 



Laid. 



Hatched. 



euba-l serva- 



tion. lion. 



Laid. Hatched. 



1 Aug. 31 



2 ...do.... 



3 ...do 



4 ...do 



5 ...do 



6 ...do.... 



7 ...do 



8 ...do.... 



9 ...do 



10 ...do 



11 ...do 



12 ...do 



13 Sept. 1 



Sept. 6 

 ...do.... 

 ...do.... 

 ...do.... 



Sept. 7 



'.'.'.do'.'.'.'. 



...do.... 

 ...do.... 



Sept. S 



'.'.'.do'.'.".'. 

 Sept. 9 



6 

 6 

 6 

 6 

 7 

 7 

 7 

 7 

 7 

 8 

 8 

 8 



8 



14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 



. S X..!. 



...do.... 

 ...do.... 

 Sept. 10 



...do 



...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 



Se &. 9 . 



...do.... 



...do.... 

 Sept. 16 



...do 



...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 



8 

 8 

 8 

 8 



6 

 6 

 6 



6 

 6 



6 

 6 

 6 

 6 



27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 

 35 



Sept. 10 



' Sept.'ii" 

 ...do 



s x-. 12 . 



...do.... 



...do.... 



Sept. 16 

 Sept. 17 

 Sept. 16 

 Sept. 17 



'.'.'.do'.'.'.'. 

 ...do...: 



...do.... 



Sept. IS 



6 

 7 

 5 

 6 

 6 

 5 

 5 

 5 

 6 



Ave 

 Maa 



Min 



rage 



imum . . . 



imum 



6.5 



8 



5 



