~~ ~— 
of nelnee beetle larvae were made in the »lots which had received 
one application of the various mater 
rials. In making these examina- 
tions, a square foot of turf w ted and the soil exemined care- 
fully to a depth of G or 8 inches for the presence of larvae at 
regular designated stations in each plot... At ‘least 30 examinations 
were made in each plot. Subsequent examinations of the various 
plots were made in the spring and fall of 1932 and the spring of 
1933. Points in each plot were designated for examinations so that 
subsequent examinations would nct be made in areas previously ex- 
amined, but in close proximity to them, as larval infestation varies 
greatly and it was desired to get res “ that would be more compar- 
able than if the examinations were made at random in each plot. The 
following table gives the materiais used, the rate of spplicataenl 
the number of applications made, and the average number of larvae 
found in at least 20 square feet of soil in each treated and un- 
treated plot. 
Results of insecticidal applications to destroy larvae of 
the Jadanese beetle in the turf, Swarthmore, Pa., 1931-33 
VS 
Dosage per Averege nunber of ‘larvae 
| 1,060 Date of _ver square foot found in _ 
Material square application October June October May 
feat 2 oto wi of ood1 95) 111082). Osea 
Untreated oe frente 31.0 24.0 5.06 2.36 
Lead arsenate 5 lbs. wo 
Activated sludge i0 " July 1931 res 5.0 0.53 0.26. 
Sand a ; 
Lead arsenate mete July 1931 ' 
Activated sludge fo October 1931 oe 2.8" 0.06. Glam 
Sand ay ® | % | 
Lead arsenate att Vive toot 
Activated sludge 10 " October 1931 -~ ~~ 0.00 0.00 
Sand 20 +" May 1932 . 
Lead arsenate eee 
Tankage rae eR, July 1931 yd 1S 0.23°" Gea 
Sand ep lt . | , 
Lead arsenate i July 1931 ° 
Tankage 1 " . October 1931 —- ws 0.00° 0.00 
sand | 290 =#«O0N 
