10 



BULLETIN 1336, U. S. DEPARTMENT OF AGBICULTTJRE 



to 7 days. During the winter the life of the moth is greatly extended, 

 because of hibernation. 



Table 2. — Longevity of moths of the green clover worm reared in confinement 



No 



Sex 



Date of 



emer- 

 gence 



Date of 

 death 



Length of 

 life 



1 





Oct. 14 

 18 

 16 

 28 



Oct. 22 

 25 

 25 



Nov. 2 



Days 



8 



2 



Male . . 



7 



3 





9 



4 





5 













Average 



7.25 







EGG STAGE 



Table 3 shows the length of the period of incubation of eggs laid 

 by moths in captivity. During the summer and early fall months 

 eggs hatched in from 2 to 5 days, but during cool weather in the 

 spring the incubation period was lengthened to as many as 14 days. 



Table 3. — Length of incubation period of eggs of the green clover worm 



Egg lot No. ! 



Laid — 



Hatched — 



Incuba- 

 tion 





Egg lot No. 



Laid — 



Hatched — 



Incuba- 

 tion 



1 



1916 



Mar. 26 



27 



28 



30 



Apr. 1 



2 



3 



4 



5 



6 



8 



9 



13 



14 



15 



16 



17 



18 



1916 

 Apr. 2 

 4 

 4 

 13 

 13 

 14 

 14 

 15 

 15 

 18 

 14 

 17 

 22 

 22 

 23 

 24 

 26 

 27 



Days 

 7 

 8 

 7 

 14 

 12 

 12 

 11 

 11 

 10 

 12 

 6 

 8 

 9 

 8 

 8 

 8 

 9 

 9 



19 

 20 



1 

 2 



3 

 4 

 5 

 6 



7 

 8 



£ 





1916 

 Apr. 20 

 22 



1916 

 May 1 

 1 



Days 

 11 



2 





9 



3 



Spring average... 





4 



9.45 



5 





July 26 

 27 

 28 



Aug. 1 

 11 

 25 



1915 

 Sept. 8 

 10 



July 31 



Aug. 1 



1. 



3' 



15 



29 



1915 

 Sept. 12 

 13 





6 



5 



7 





5 



8 





4 



9 





2 



10 





4 



11 





4 



12 







13 





14 



4 



15 





3 



16 



ummer and early 

 fall average 





17.... 





18 



3.88 













1 Each lot contained from 15 to 1,104 eggs. 



LARVAL STAGE 



GENERAL HABITS 



In hatching, the larva eats a ragged hole at one side of the apex of 

 the egg just large enough to permit exit. It then works its way slowly 

 out and at once searches for food. During the first three instars the 

 larva, when feeding on alfalfa, skeletonizes the leaf, leaving the upper 

 epidermis intact; but beginning with the fourth instar it eats entirely 

 through, avoiding only the larger veins. On large-leaved plants, such 

 as soybean, the iarvse are usually found stretched out on the under 

 side of a leaflet; but on plants with smaller foliage they commonly 

 feed extended along the stem, and in these positions their color blends 



