EXPERIMENT STATION REPORT. 



)69 



the first larva was seen, and not over twelve days from the first 

 hatching. At this time the first signs of leaf-folding were noticed. 

 The larvffi abandoned the leaves upon which they had first fed, 



Fig. 20. 



Work of young black heads on cranberry leaves : a. the mine in the leaf, free of ex- 

 crement; b, the mass of excrement on leaf which indicates a young 

 larva; c, feeding done oq old leaves before the tips are 

 spun up ; all much enlarged. Original. 



crawled nearer to the tips of the spray and, where two leaves ap- 

 proached, fastened the under side of the one to the upper side of the 

 other. This was at the end of the first or the beginning of the second 

 stage, hence there was no superficial sign of lan^al development on 

 a plant until the caterpillars were already more than a week old. 

 Unhatched eggs on the leaves brought in had mostly collapsed, though 

 a few were yet present in good condition. 



j^la^j sth.— All the eggs along the bogs had hatched. Most of the 

 larvfp had abandoned their first quarters and had begun to fasten 

 leaves together. There was a general change to the second stage, and 

 any cranberry gi'ower could then realize that the "worms had hatched." 

 The submerged vines w^ere again examined, no larvas were found, and, 

 as the water on the bogs was to be dra^vn on the 8th, they were brought 

 to New Brunswick. Examined on the 8th in the laboratory, it was 

 found that most of the eggs were dead ; a few were apparently alive, 

 but only one appeared normally developed and ready to hatch. 



