4 BULLETIN 1169, U. S. DEPARTMENT OF AGRICULTURE. 
THREE-YEAR-OLD ORCHARD TREES. 
The same experiments conducted on the 5-year-old and 4-year-old 
trees were also conducted on 3-year-old trees. Table 3 gives the results 
on effectiveness of the various doses used. 
TABLE 3.—Results of different treatments of paradichlorobenzene on peach-borer larvxe 
in 3-year-old Hale peach trees, Fort Valley, Ga., 1921-22. 
| 
| Number of larve found. Per cent of larve. 
Num-| size of Date | Dateex-|; Exposed | 
esd af dose. | applied. |} amined. to gas. ae St 
- Dead. fied Active. | Dead. ea: Active. 
Ounces. 1921. 1921-22. Days. 
5 | 41 Oct. 11°} Nov. 2 22 0 0 1 0 0 100.0 
5 | eT doen 8 28 0 | 0 1 0 0 100.0 
5 yo ess hepa 22 42 0 0 Oy) Alo thee 28 
5 4 |...do.....| Apr. 12 | Over win- 0 | 0 eS ees ee A Ae 
ter. 
5 | 2 5\c..-G0.0.-..| NOY... 2 22 0 | 0 OY Teiaie = otal] acl oe =a 
5 | gal edges. 8 28 0 0 OY, ee erie (ed SE eh 
5 | ch@een 22 42 0 0 Ob Se Strole Seen | 
5 | 3 |_..do.....| Apr. 12 | Over win- 2 0 0 100.0 0 0 
ter. : 
5 1 GGsce. s Nov.-' 21 22 0 0 0g Sree eevee 
5 1 dosoots 8 28 0 0 OU Se oes: | ob aoe ol eee 
5 iG F150 en 22 42 0 0 Oe eo cate lob ten on Se eee 
5 1 |...do.....| Apr. 12 |, Over win- 0 0 1 es eens (NS Sry Mr Se 
ter. 
5 14 | Oct. 18 | Oct. 22 0 0 0) | enc <0 2 lobes sacs eee 
5 t |h2td0:.< 26 8 0 0 a Se il i DS 
5 1A che dOss 31 13 0 0 O-lcscerecslo race ser ae 
5 2 Go: 22 4 2 1 0 66.7 33.3 0 
5 2 dose. 26 8 1 0. 0 100. 0 0 0 
5 2 Ose 31 13 0 0 Ol ee lee oe 
5 254) GO: A 22 4 0 0 Oe) SA ie ees 
5 24 (lo..22 26 8 0 0 Of eetress.ce|baes 2. Fal eee 
5 FA, Seve 60 Yeewe al 31 13 0 0 Oslo eseecscls seep eet | 
JA; | \@heek.'s }s 2h 5526 - NOVs{22712.:5- to Sut 0 0 2 0 0 100.6 
3 | Check. oe Aver 109). ote os 0 0 Golesi Lis eee | ae eee 
» TWO-YEAR-OLD ORCHARD TREES. 
In the experiment on 2-year-old trees 105 trees were used. The 
tests included both long exposures of small doses and short exposures 
of large doses. For the long-exposure tests, one-half and three- 
fourths ounce doses were applied October 11, 1921. The soil was 
removed and examinations made on groups of five trees in both the 
one-half and three-fourths ounce test plats three, four, and six weeks 
after the material was applied. The check or untreated plat of this 
experiment was examined six weeks after the application was made 
to the treated trees. ' 
For the short-exposure tests, three-fourths, 1, 14, and 2 ounce 
doses were applied October 21, 1921. The soil was removed and 
examinations made on groups of five trees in each test 4, 8, and 12 
days later. The trees in the check or untreated plat of this experi- 
ment were examined for borers the latter part of November. 
Table 4 gives the results on effectiveness of the various doses used 
on the 2-year-old trees. 
‘~ = 
