216 THE PLUM CURCULIO. 
In Bulletin 9 of the Iowa Agricultural Experiment Station, page 
383 (1890), Prof. Gillette gives results of experiments on plums with 
London purple on the plum curculio and plum gouger. The poison 
was applied with a hand pump to 23 trees at the rate of 1 pound to 
120 gallons May 4 and 11. The leaves were badly burned. After 
May 25 all drop fruit on 5 trees each of the sprayed and unsprayed 
blocks was examined. A total of 21,000 plums was examined, and a 
benefit was determined of 1.1 per cent in favor of spraying. 
SOME RESULTS OF SPRAYING PLUMS. 
At Fort Valley, Ga., during 1905 Mr. Beattie carried out some spray- 
ing tests on Japanese plums. The plats were, however, small and 
there was considerable overflow from the surrounding unsprayed 
trees. Plats were laid off, extending across three varieties, namely, 
Wickson, Red June, and Satsuma, in which order the varieties are 
given in the table. The entire crop throughout the season from 
three trees of each variety was counted with the exception of Plat I, 
where only 2 trees were used. Plats received from 1 to 3 applications 
of arsenate of lead in water, without addition of lime. According to 
Mr. Beattie’s notes practically no injury resulted to the foliage from 
the sprays. The results are given in Table CVI. 
Taste CVI.—Results of spraying Japan plums for the plum curculio, Fort Valley, Ga., 
1905. 
Fruit f 2 |9|5 | 3 & | & 
Oy Truit from tree. | 3 2 Wey lee s Pale! 
ground. m|2 . = RC Es 
al 2 iss g Om | oe 5 
5 BS 3 os os 
Plat ~ j $3 15 la=| as |] 82 | og 
No Treatment. Pt sate Soi. Pas Ag) AS | Bg | &8 
NO. 6/81 a | ss ETE cz | ane SA 
4 S| So Pe) BS rh Soe (eee te ey aes 
ala 8/5181 eles! 2 12 {SSS ee 
Sa Sree acl ahs. | telsea le oatll ce eaee |p > SH 
® HIAI/A INIA I|Aa |e] a = H = is < Ay 
Tee One application, ar- 
senate of lead, 2 1) 52) 44 2| 54) 152) 37] 26 178 204; 81} 28 232|'4 35 oca| sone 
pounds to 50 gal- 2| 236] 213) 114) 350) 60 4! 300} 360) 296) 217) 414 PLO sees | See 
lons water, Mar. 19. 
288] 257) 116] 404) 212] 41] 326) 538) 500) 298} 442) 942) 46.92) 39.41 
II....| Two applications ar- 
senate of lead, 2 
ounds to 50 gal- 
ons water, Mar. 19 
and Apr. 20. 
255| 211) 71} 326) 430) 28) 527) 957) 685] 239) 598) 1, 283)..._.- 
: 38] 410) 31) 11] 35 66) 403) 356) 73) 476)......|...... 
210} 172| 32] 242) 73) 15) 200) 273) 283] 187] 232) 515)......)...... 
whore 
wo 
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BG 
rag 
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ie) 
2) 
837] 728] 141) 978} 534) 54) 762) 1,296} 1,371 
88] 69; 72] 160] 90} 25; 270) 360) 178 
8 218} 90) 30) 194) 284) 243 
108] 92} 53] 161) 72) 8/ 313) 385) 180 
arsenate of lead, 2 | 
pounds to 50 gal- | 
lons water, Apr. 4 
and 20, May 4. 
whore 
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TII...| Three applications | 
349] 299] 190} 539} 252) 63) 777) 1,029) 601 
6s 45| 31| 991 40/ 9| 35| 75] 108 
135| 105] 17} 91/ 196| 210 
72| 58; 10 s2| 11s| 36/ 6) 124| 190 
IV. .=|) Umsprayed:. =... |< 
Whe 
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245| 190} 71) 316; 263} 62/ 132; 395) 508 
