FIG. 6. Pupa of the elm 

 leaf -beetle . 



weather this period may be prolonged several 

 days. The writer found that in Ithaca, last year, 

 the majority of the eggs were laid during the first 

 three weeks of June. By June 2oth the young 

 grubs w r ere appearing in force. The grubs eat 

 ravenously, increase in size very fast, and com- 

 plete their growth in fifteen to twenty days (Fig. 5). 

 When full grown they either crawl down the trunk 

 of the tree or drop from the ends of the branches. 

 At the bases of the trunks many of the larvae 

 transform to the yellow pupae (Fig. 6). Some- 

 times they are so numerous that the golden pupae 



lie an inch deep about the foot of the tree. Others 

 transform in crevices of the bark, especially if the 



trunk is rough, others go to the gutters, while others seek shelter in 

 crevices of the sidewalk and wherever they can find hiding places. The 

 quiet, inactive pupae lie motionless for six to ten days and then trans- 

 form to the adult beetles, thus completing the life round of one genera- 

 tion. Our observations show that in Ithaca we have one generation, 

 with a possible second, the latter, however, being so small as to cause 

 no serious damage. 



METHODS OF CONTROL 



The elm leaf-beetle can be controlled effectively only, by spraying 

 the trees with an arsenical poison, preferably arsenate of lead, at the 

 rate of three or four pounds to fifty gallons of water. (See Fig. 7 for 



FIG. 7. Sprayed elm at right, unsprayed at left. 



