8 BULLETIN 599, U. S. DEPARTMENT OF AGRICULTURE. 
FEEDING PERIOD OF FIRST-BROOD LARVA. 
The feeding period of the larve in the rearing cages in 1915 ex- 
tended from June 15 to August 5. In 1916, larvee were feeding from 
June 22 until August 1 as shown in Tables IV and V. The longest 
feeding period recorded was 48 days, the shortest 22 days, and the 
average 29.6 days for transforming larve, and 34.2 days for over- 
wintering larve. On July 28, 1915, the writer came upon the in- 
jury on sand cherry. The infestation was at its height and prac- 
tically all the insects in the larva stage. By August 11 about one- 
half the larvee had left the webs and newly formed pupz were to 
be found in the soil. Observations made on September 14 showed 
that from 95 to 98 per cent of the larvee had left the webs. 
TABLE [V.—Length of feeding period of transforming first-brood larve of the 
striped peach worm, 1916. 
Date of | Number Date of | Number 
Date of hatching. |ofcocoon-| of Pays of Date of hatching. | cocoon- of fe te of 
ing. | cocoons. | 1¢¢@8- ing. | cocoons. | *&&¢8- 
July 20 1 AS ||| GRUPO OR sa gooscco ease July 17 2 22 
July 22 3 30 OR ees July 20 2 5 
July 24 1 32 LDYo peers Ms ies July 26 1 31 
July 26 1 34 ee 
July 27 2 35 Totale ea anes) re eee TEED Is Says Se Z 
July 28 1 36 
Maximum length of feeding period . ie FOE YOE Yar 2 sae RT ae Sees SAE Se eee days. - 
Minimum length of feeding period ...........-...--..-------- +--+ +--+ +--+ 2-22-2222 do.. 
Average length of feeding period...-..-.-.------------.------ 0-22-22 eeeeeeeneeees do.. 29.6 
TABLE V.—Length of feeding period of wintering first-brood larve of the striped 
peach worm, 1916. 
Date of | Number | Date of | Number 
Date of hatching. | cocoon- of 2 aye of Date of hatching. | cocoon- of eouiee 
ing. cocoons. | *°°!8- ing. cocoons. S 
MUN} 22 = ee ae July 20 2 Q8ei UnNete2 nee eee Aug. 9 1 48 
Ornee rose ee July 23 1 Sia Juneloneane eee July 17 1 22 
AD Yo yes ees Si ahh July 24 2 32 Doses s...| July 26 3 31 
Boyer ta Sem a July 27 1 35 || July 5 5 July 31 1 26 
IDO ee July 28 4 3 Ope ae Aug. 1 27 
TB Yosef ten ie or et July 31 3 39 
DG), Sh eS July 30 2 38 Motal ss 28s soe ae D3 Seo eeeece 
ID Yoaerines Sareea Aug. 8 1 47 
Maximum length of feeding period...............-.--------------+------------ days.. 48 
Minimum)! lenethiofteedingiperiod- =. 22 sees eee ee eee oes =e ee ee do.. 22 
Averapellength of feeding period._ 1... ...- 222222222222 22 22-252 - seen ---- <= do.. 34.2 
CocooNING OF First BRroop. 
Cocooning takes places in the soil at an average depth of one-half 
inch, in fine sandy loam in the rearing cages, and this was found to be 
the usual depth in the soil in the field where the pupe were found. 
Of a total of 203 individuals recorded, 31 pupated on the surface of 
the soil, 154 in the upper half inch, 18 in the second half inch, 
