250 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 12 



Fence rows full of poison ivy, sassafras, and weeds, food plants of the 

 beetle were killed or could be set on fire and burned on warm breezy 

 afternoons, even two or three days after they were sprayed. 



Fire following the spraying does a clean job, but as oil could not be 

 procured after July 1, due to the dry rider on the federal appropriation 

 bill holding up available funds for this work, and New Jersey's funds 

 for this work being appropriated, contingent to the use of the federal 

 funds first, operations were handicapped for several months and oil 

 treatment was abandoned. 



A hmited amount of federal funds were available for labor or the 

 work would have stopped. 



Dusting all food plants in a band one-half to one mile wide around 

 the territory heavily infested by the beetles was begun July 14, and 

 continued through July, August, and until September 16. One big 

 Niagara dusting machine, pulled by the tractor, was in operation contin- 

 uously, weather permitting, and as rain usually fell at night little hin- 

 drance was experienced from weather. When one duster went out of 

 commission, the other one was pressed into service until the broken 

 one could be repaired. 



One hundred pounds of lime was mixed with 15 pounds of dry arsen- 

 ate of lead and in a small dust mixing machine. Later, the amount of 

 arsenate of lead was increased to 20 pounds to 100 pounds of lime. 



The last few days of the dusting, 24 pounds of arsenate to 100 pounds 

 of lime was used as a test on amounts of poison needed. The acreage 

 dusted cannot be estimated with any exactness but the total territory 

 covered in the dusting operations can be estimated approximately: 



First treatment 4,000-4,500 acres 



Second treatment 4,500-5,000 " 



Third treatment 4,000-4,500 " 



Fourth partial treatment 1,000 



13,500-15,000 " 



Total area dusted, 13,500 to 15,000 acres which includes large tracts 

 on which no dusting was done, such as hay fields, pasture lots and 

 fields free from food plants of the beetle. 



Difficulty was experienced in dusting the area rapidly enough to keep 

 the food plants covered with poison. Weeds grow rapidly and Poly- 

 gonum or smartweed and other weeds grow very rapidly during July 

 and August. Dead beetles were found under poison-dusted asparagus 

 and smartweed at different times throughout the season but in most 

 cases, the effective kill was difficult to determine as poisoned beetles 

 usually had enough strength left to bury themselves in the ground. 



