128 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
curculio, as on this latter the beetles were quite abundant, as shown 
by the low total percentage of uninjured fruit, namely, 8.85 per cent. 
In view of the habits of the curculio in ovipositing and feeding over 
a considerable period (six to eight weeks or more), the results from 
the one-spray method are the more surprising, and it would appear 
that the single treatment resulted in their almost complete destruction. 
In Table VIII are brought together data showing the effects of the 
treatments in the control of the three principal insect enemies of the 
fruit, namely, the codling moth, the plum curculio, and the lesser 
apple worm (Hnarmonia pruniwora Walsh). The value of the one- 
spray method is here put to the severest possible test so far as con- 
trolling insect enemies of the fruit is concerned. It will be noted 
that when these three insects are taken into account somewhat better 
results were secured from Plat IV, which received the demonstration 
treatment, namely, 81.19 per cent sound fruit, as against 79.60 per 
cent sound fruit from the one-spray plat. The unsprayed plat (V) 
shows a very low percentage of fruit free from injury by these three 
insects, namely 6.94 per cent. 
Taste VIII.—E fect of treatments on the three principal fruit insects and total percentage 
of sound fruit. Siloam Springs, Ark., 1909. 
PLAT I. ONE-SPRAY. 
Tree 1. | Tree 2. | Tree 3. | Tree 4. | Tree 5. | Tree 6. | Tree 7. | Tree 8. 
Injured by plum curculio.........-.. 1,179 915 687 387 208 532 370 706 
Injured by codling moth............- 703 522 419 118 181 222 286 315 
Injured by lesser apple worm......-. 71 74 41 6 31 17 19 30 
Number injured apples..........--.- 1,778 | 1,403 | 1,062 486 409 739 652 991 
Number uninjured apples........-..-- 3,911 | 3,410] 2,734 | 2,264] 3,037] 3,023 | 2,655 4, 452 
Total numberapples-2:..:-.--------- 5,689 | 4,813 | 3,796 | 2,750} 3,446] 3,762 | 3,307 5, 443 
abe pote 
ota. er cent |per cen 
Aree ie Tiree ox Tree | “for free from] free 
: ; : plat. | injury. | from 
injury. 
Injured by plum curculio......------ 364 216 BOD |e sate atic Meeione 5, 899 S684 bates: 
Injured by codling moth......-.-..-.- 110 113 TIS Ne | Pe ees eer Ley 3, 120 92.9745 ee zeae 
Injured by lesser apple worm......-- 10 5 OR evslsectoa | Serer 309 995205 |Saa eee 
Number injured apples......-.------- 473 349 460) [ac aae stile apes 85802. |Ecc os nceuleeeeearre 
Number uninjured apples......-.-...-- SS LZ6Nle, B08) | to; toanlee eee Bs SHS RS asl Meter acre 79. 60 
otal mumiber applesae. .- = cet = BER GAGE || BAEK | Popescelaosces 43152 7|Ueeaae eens | soomee 
PLAT III. ONE-SPRAY. 
Tree 1. | Tree 2. | Tree 3. | Tree 4. | Tree 5. | Tree 6. | Tree 7. | Tree 8. 
Injured by plum curculio..........-- 1,051 349 533 368 358 | . 795 727 372 
Injured by codling moth. ........-.-- 397 298 286 431 321 247 231 200 
Injured by lesser apple worm.......- 29 19 14 32 40 22 26 12 
Number injured apples.........----- 1, 363 525 772 806 684 | 1,010 919 551 
Number uninjured apples..........-- 3,386 | 2,960] 1,972) 1,846] 1,557 | 2,560 | 1,962 1, 441 
Total number apples............----- 4,749 | 3,485 | 2,744 | 2,652 | 2,241] 3,570] 2,881] 1,992 
