

es ——— 
t 
“Soil population according to depth in inches 
Bee EE2 2ieted 14to6 26 to 8 TBI IS 

Period 26 tol 4 : 
: Percent s percent: Percent s, Percent ; Percent: Percent 
April l+10---: 10. 9 ° Sg : 57 05 : Te ' eS 0 xe 0 
11-20---: 34.2 Be POs ook wi@s6:s enti. ox, 
21n30n== ti; O4edy « eethOey ot. beh: fet moe tee ra Oe 
Montha-+<ase sia Bbvbug uN pe 2007 pit : pes O +: 0: 
It is evident from the results given above that the periodic upward 
movement of the larvae was in progress throughout practically the entire 
month of Aprile As usual, this movement was coincident-with thé rise of 
soil temperature above 50° Fe at the depths occupied by. the larvae 
Seasonal fluctuations.--Data on changes in population frequencies 
during the current annual. “eyele of the Japanese beetle were derived in 
April from the records of both seasonal and periodic series Py SOre aa 
conducted by Mr. Fox in 1943-44. 
The general results along this mies as summerized from the records 
of the seasonal series of surveys are tabulated as follows; 

Average larvae per squ uare foot 
¢ New Jersey : Pennsylvania ‘:_ : 
Period cae ti __Stations : stations : General 
soe) | Numper ane Number : Number 
DoteaVlielh--n-yine eueie o19 fmt One omnes a ORG 
16~31 a e 6.8 eli : 8.0 
Nove 1-15~---- : 69 : 6 : Te 
16~30-~--~ : be4 : Gel : "705 
Decs 1-15----- : bag : iat : 704 
Mar. L643 esa: byes. ° 6.6 : 2rd 
Apre 1-15----- : ps5 : ‘evaesl ; oC 
16-30 ech a as ° 00 >! ¥ 3 ( 05 ° [04 

