136 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
As will be noted, the difference in results between the demonstra- 
tion and one-spray plats is quite small, namely, 1.06 per cent in 
favor of the former. The unsprayed trees show 54 per cent of sound 
fruit, and there is thus a gain on the demonstration plat of 38.74 and 
on the one-spray plat of 37.68 per cent of sound fruit. <A total of 
61,424 apples was examined from Plats XIII, XV, and XVII, 
respectively, as follows, 16,292, 19,502, and 25,630. 
The influence of the treatments on the places of entrance of fruit 
by the larvee of the first and second broods combined is shown in 
Table XIV. 
TaBLe XIV.—Places of entrance of fruit by total larvx for each tree of each plat. Mount 
Jackson, Va., 1909. 
PLAT XIII. DEMONSTRATION. 
Total number of larvee and places of entrance of fruit for each tree, first and Percent- 
second broods combined. ages of | otal 
Total larvee Bd 
l ; a 3 for entering ber of 
ae arene ese = = = = plats. | at calyx, ten 
Planes Gian tianiee. ree Tee ree | Tree | Tree | Tree | Tree | Tree side, and : 
| 4 BE. 3 MS BS Ramage rea Mae ae ra fe Sina 
o 
First and second broods: | 
Calyx oars paca -eaeee 32 14 15 16 20 26 15 24 162 13. 68 
Sid@seet, ssc HAS Aaceeslae 154 111 122 58 136 125 92} 116 914 Trae Poese ene 
SCM Is -8a525 o.ssae ee 14 11 18 9 17 17 12 10 108 to el be fet  omi 
Total. = seta: ose ee 200 | 136 | 155| 83 173 168 119 150 1, 184 100. 00 1, 184 
PLAT XV. ONE SPRAY. 
Calyx. aes ec neces ls 32 | 6 LGHlS S25 19 18 17 146 8.99 |. 
Sid ehseee ser aeeeeeee ce | 190 193 44 143 173 183 91 214 1, 261 STAY 
Siem); ees aesiqse elec i A 28 6 27) 52 17 13 26 216 13.31 |. 
| | = 
| 
ARGOS sas SeGcceoces |} 250] 253 | 86) 186] 250) 219 | 122) 257 | 1,623 100. 00 1, 623 
PLAT XVII. UNSPRAYED. 
| | | ! . 
| 
3 1,063 | 69 
| 
Calva tees crea 1, 466 9 | 762 |1,232 |1,377 |1,584 | 969] 9,152] 77.62 J. 
Bldessea seasons out 332 | '265| 119) 141 | '203 | "205 | 353 | 209] 1,917] 16.26 |. 
Stems ks eevee oo | 1150] 07 te 47 3l- R08)" t03.|" 12001) 904! "6o)| "= zat 6.12 
otis A Mae eee aa ee 41,913 1,425 865 | 983 |1,538 /1,792 |2,027 |1,247 | 11,790 | 100.00 
| 
The demonstration plat shows 13.68 per cent of total larvee entering 
at calyx end as compared with 8.99 per cent on the one-spray plat, 
the percentage entering on the sides being practically the same in 
both plats. The demonstration plat, however, shows a reduction in 
total number of larve, having 1,184 larvee as against 1,623 for the 
one-spray plat and 11,790 for the untreated trees. 
THE PLUM CURCULIO. 
The plum curculio proved to be unusually destructive in the 
Strathmore orchard, which had not been plowed for at least two 
years and had grown up in grass and sod. The results of the respec- 
