| 
STRAWBERRY ROOTWORM ON GREENHOUSE ROSES 41 
TABLE 15.—Hffect against the strawberry rootworm of miscellaneous treatments 
on larve and pupe in soil of potted rose plants 
Condition when examined 
Number Ree 
wa riod Larvee Pups 
Material and amount per plant after 
feat 
men 
Lar- | Pu- : Miss-| Con- P Miss-| Con- 
ve | pe Dead | Alive ing | trol Dead | Alive ing | trol 
Days Ps et. Be ct 
Borax, 1 gram in % pint water!__| 20 0 5 1 U ll 5 0 1 0 0 
Borax, 2 gramsin 4% pint water?.| 20 0 5 0 3 17 0 0 0 0 0 
Orthodichlorobenzene, 3 c. ¢.3__---| 20 10 5 20 0 0! 100 10 0 0 100 
Mercuric chloride (1-800), 14 pint 2 40 5 3 0 17 23 0 0 0 5 0 
Wood ashes, soil covered 4% inch i i 
COO sees tat ie ee te Bae 10 0 9 0 3 5 0 0 2; 0 0 
TYG) ee gi Ae Bat IL aS) ae 10 10 6 0 8 2 0 2 0 1 20 
Tobacco dust, soil covered 44 inch 
(SEED) ag SE ct a LA RIE 10 10 6 0 3 i, 0 0 I 9 0 
Lye (sodium hydroxide), 1 tea- 
spoonful in 4% pint water 5___--_- 10 0 5 3 6 1 30 0 0 0 0 
Lye (Sodium hydroxide), 1 tea- j 
spoonful dry and then watered‘_| 10 0 5 5 5 0 50 0; .0 0 0 
Nicotine sulphate, 2 drops in 225 : 
excuwaterits snes ree 10 0 5 0 1 9 0 0 0 0 0 
Kerosene nicotine oleate, 8 c. c. in 
BO CC sWatel os sasse S222 eee 20 10 5 12} 0 8 60 5 0 5 50 
Kerosene nicotine oleate, 16 ¢. ¢. 
ATNZ50.Cs Ca watery 322 22-8. aes! 20 OP ie aio) 18 0 2 90 9 0 1 90 
Checks{(no treatment)_____------- 20 10 5 0 9 11 0 1 0 9 10 
J DY) 5 Ser Aa 2 2 es YO 20 of 5 0 1 19 9 0 0 7 0 
TD Yo) a ga pee hap A Ed aoe 43 5 5 0 4 39 0 0 0 5 0 
1D) ap alae Sa HO ED Be 9 4 5 0 6 3 0 0 2 2 0 
1 One larva pupated. 3 Effective. 5 Slightly effective. 
2 Ineffective. 
4 Two larve pupated. 
6 Fairly effective. 
TABLE 16.—Hffects of paradichlorobenzene soil tr eatments on larve and pupe of 
the strawberry rootiworm buried in pois 
Number of— Period 
Condition when examined 
Pupse 
Amount 
of | heed Larve 
material mane 
Larve | Pups Dead | Alive |Missing Control Dead | 
Grams Days Per cent 
i 25 10 6 24 0 1 96 10 
2) 60a 25 10 6 25 0 0 100 10 
“On ae 10 0 5 5 0 5 50 0 
Ca 20 0 6 17 0 3 85 0 
ee 10 4 5 6 0 4 60 4 
Alive |Missing|/Control 
Per cent 
0 0 100 
0 0 100 
0 0 0 
0 0 0 
0 0 100 
The results obtained with paradichlorobenzene in preliminary tests 
were so satisfactory (see Table 16) that this material was used in 15 
plots in an infested bed. In 10 of these the larve and pupe were 
counted and their condition was noted in order to determine the in- 
Table 17. 
~secticidal effect of this chemical. 
These data are presented in 
