June, '19] GOODWIN: JAPANESE FLOWER BEETLE 249 



We (Mr. Ellis and I) were anxious to get the results and dug the test 

 plots two to three days after treatment. A kill of 65 to 80 per cent 

 resulted from this treatment. 



Plots treated later on in the season (duplicate halves of others) 

 in which the kill averaged to 60 to 65 per cent of all grubs 3 days after 

 treated; when dug six to seven days after treatment gave an increase 

 of approximately 15 per cent to 20 per cent in effectiveness, killing 80 

 to 90 per cent of the stages in soil. 



The partial larval survey, made by C. A. Perry and myself, gave us 

 ample territory that was heavily infested with larvse to be treated but 

 no materials or equipment had arrived by mid-June. Trap light 

 towers were constructed, gasoline lanterns and pans were purchased 

 and these were put in place through the central part of the district. 

 Counts of beetles caught in the pans by the latter part of July gave an 

 average of less than 20 beetles per lamp where the lamps were kept 

 burning every night. Several towers fully equipped, but which did not 

 have the lanterns lit on account of failing to catch beetles, averaged 

 above 250 beetles per tower. The trap lanterns were a failure; some 

 one had made a bad recommendation, if we can rely on the transla- 

 tion from the Japanese literature or else we have a change in habits of 

 the beetles. Such things sometimes make one question species 

 indentification. 



As no more equipment or materials had arrived by June 20, 1918, 

 steps were taken to get the eradication work under way. A Ford 

 runabout had been purchased at New Brunswick and, through Dr. 

 Headlee, we secured a small supply of sodium cyanide at Perth Amboy 

 and brought it to the scene of operation in the Ford. The Ford was 

 provided with a hundred-gallon gasoline tank and a fair capacity force 

 pump was borrowed and belted to the engine on one of the duster 

 trucks. 



This was used to pump water from a creek and the cyanide treatment 

 was begun. 



A small beginning but under way finally, enabling the treating of 

 between one and one-half and two acres of sod land, along ditches and 

 roads, that was heavily infested with larvse. June had passed into 

 history, also eight days of July before the tractor arrived by express. 

 The sprayer also arrived, but with some parts broken, so it had to be 

 repaired l)cfore it could be used. 



Oil and oil combinations had been tested in a small way as weed 

 killers as the things ordinarily used were dangerous to live stock if 

 they ate the treated grass or plants. Kerosene, alone, was inefFective 

 but a mixture of cheap lubricating or summer black oil, using equal 

 parts or 2 or 3 parts kerosene to 1 of black oil, gave promising results. 



