THE LEGUME POD MOTH. 



103 



Table IV. — Mean percentage of damage done by the legume pod moth to all plats in full 



bloom on a given date in the season of 1911. 



Full bloom. 



June 12 

 June 16 

 June 19 

 June 28 

 Julyl. 

 July 3. 

 July 5. 



Mean per 





cent of 



Number 



seed 



of plats. 



damaged. 





0.0 



1 



.0 



1 



.0 



2 



.5 



10 



1.1 



1 



.2 



1 



1.9 



3 



Full bloom. 



July 7. 

 July 8. 

 July 10 

 July 12 

 July 13 

 July 15 

 July 18 



Mean per 



cent of 



seed 



damaged. 



1.7 

 .6 

 1.5 

 1.7 

 1.8 

 1.9 

 2.5 



Number 

 of plats. 



19 

 3 



2 

 1 

 6 

 15 

 1 



7.0 



CO 



SO 



+.o 



3.0 



2.0 



t.O 



<v9 



\ 



vs 



\ 



V9 



<-M 



^ 



1 





\ 



\ 



\ vs ^ 



\ A M M < \ <\i 



Fig. 40.— Diagram showing mean percentage of damage done by the legume pod moth to varieties of peas 



in full bloom on a given date in 1911. (Original.) 



ARTIFICIAL DISSEMINATION. 



On examining sacks of seed peas, September 14, 1911, a larva was 

 found enclosed in a very tough silken cocoon. On October 24 

 another larva was found in a second sack. Mr. Evans also found a 

 hibernating larva in a seed sack and kept it alive on his desk during 

 the greater part of the winter. It seems as if this insect could very 

 easily be introduced into regions where it does not at present occur, 

 by being shipped with the seed field peas. 



