PARADICHLOROBENZENE ON YOUNG PEACH TREES. i 
TABLE 11.—Effect of different marimum temperatures and different amounts of moisture 
in the soil on the time required to kill peach-borer larvx, 1922. 
INDOOR CAGES. 
| Condition oflarve. 
Per cent} 
Maxi- | of mois- at SLagpy Cees ESB 
mum | turein ate = 
temper- soil larve Jan.11. Jan.15. Jan.17. pares Per 
Cage | ature | when | were , ae mill |.cent Remarks. 
No. | during} larvee | exposed | [u! | |= Ey larvae. _ | Killed. 
ex- were to gas. Sal lle! |e 
posure. | exposed bed 2ee2Flgeit 
hae Sis S(Sisisisisis 
Alas Ajai<|A |S 
| 
°F. | Percent Pp. 
I} 90 17.6] Jan. 4 | 1/4 0) 4) 1) 0} 5) 0] 0] 13 days....| 100} Average temperature 80.9° 
| F.; strong odor of gas 6 
inches down on Jan. 5; 
larve did nofeeding. 
Il 90 18.1 4 | 0} 5; 0] 5) 0) 0 .| 11 days.... 100} Average temperature 80.3° 
F.; strong odor not noted 
| until Jan. 9; larve fed 
faa before death. 
Til 90 27.6 4 | 0} 5} 0} 5| 0}. 0}. .|..]..] 11 days... 100} Average temperature 80.3° 
| F.; strong odor not noted 
until Jan. 11; larvee fed 
of before death. 
IV 80 17.6 4 | 11 4) 0) 4/1 5! 0} 0) 13 days... 100} Average temperature 69.5° 
F.; strong odor Jan. 5; 
larve did no feeding be- 
fore death. 
Vv 80 21.1 4 { 1| 4] O} 5} O} O}..)..]..| 11 days... 100} Average temperature 69.5° 
F.; strong odor Jan. 11; 
larvee fed before death. 
Vi 80 30.3 40a) 4) OF 5) G] GO}... -| 11 days... 100; Average temperature 69.5° 
F.; strong odor Jan. 11; 
| larvee fed before death. 
VII | Check (2) 4/00 5| if ey Cmaa, ie eee ee 0} Larvee fed continually. 
OUTDOOR CAGES. 
| Jan.11.\Jan.17. Jan. 23. 
Vu 70 17.60) Jan. 6 | 0} 5) 0 s| 0} 0j)..|..]..} 11 days.... 100) Strong odor noted Jan. 11; 
larve did no feeding be 
fore death. 
Ix 70 19.8 6 | 0} 0} 5] 1] 4) 0) 5) 0} O} 17 days... 100) Strong odor noted Jan. 19; 
; larvee fed before death. 
x 70 27.6 6 | 0} O} 5} 1) 2! 2) 1) 4) O| 1 Killed in 20/ 100 per cent killed in 21 
17 days. days; larve fed before 
death; strong odor Jan19. 
eS ET t@lsoeke [452525 }5-f2<.'3-2h524 | 0| 0 5| 0| 0 5| OQ) Ohl3. 23.5. £35: 494 --| Larve fed continually. 
ICED CAGES. 
Jan. 20.|Jan.28.|Feb. 4. 
xi i 16.4) Jan. 13 | 0 5 0} 0} 5) 0} 5 a 0) 23 days.... 100| Strong odor noted Jan. 28; 
larvee fed before death. 
XU | 34 20.7 13 | 0| 0| 5| 0} 4| 1] 0| 5| G| Nonekilled 0| 100 per cent killed in 29 
in 23 days. days; larve fed before 
death; odor of gas re 
mained mildin this cage. 
DL OMe a OO a Or Gla Ol Ol aiceasess caeael- oc. ss Larve fed continually; 
made cases and entered 
bark furnished for food. 
1 Normal! soil. 
NoTE.—AI]I cages contained 1 ounce of paradichlorobenzene and 5 larve each. All larvee were placed 
6inches below the crystals. 
