10 THE PLUM CUECULIO. 
Page. 
Plate XV. Benefits of spraying apples for the plum curculio. Fig. 1. — 
Duchess apples from trees in unsprayed plat. Fig. 2. — Duchess 
apples from trees in plat sprayed against the plum curculio with 
arsenate of lead 196 
XVI. Conditions favoring the plum curculio. Fig. 1. — Native plum 
thicket in the south, adjacent to peach orchard. Fig. 2. — Woods 
and thicket adjacent to plum orchard, furnishing the beetles 
with excellent hibernation quarters 200 
XVII. Effect of arsenical sprays on peach foilage, Arlington Farm, Va. 
Fig. 1. — Unsprayed or check tree. Fig. 2. — Tree sprayed once 
with commercial arsenate of lead. Fig. 3. — Tree sprayed once 
with homemade arsenate of lead. Fig. 4. — Tree sprayed once 
with Paris green. Fig. 5. — Tree sprayed once with green arse- 
noid. Fig. 6. — Tree sprayed once with arsenic sulphid 208 
XVI II. Arsenical injury to fruit. Fig. 1. — Elberta peach sprayed three 
times with arsenate of lead, showing burning and cracking effect 
of the poison. Fig. 2.— Japanese plums, showing burning from 
one application of arsenate of lead 208 
XIX. Field experiments in Georgia for control of plum curculio and 
peach diseases. Fig. 1. — Gasoline power outfit in operation. 
Fig. 2. — Determining results of spraying, each peach being cut 
open 212 
XX. Size of peaches at time of first spraying with arsenate of lead, show- 
ing on the left the earliest and on the right the latest stages in 
development when this treatment should be given 214 
TEXT FIGURES. 
Fig. 1. Herbst's figure of plum curculio, accompanying the original descrip- 
tion in 1797 16 
2. An early illustration of the plum curculio, frequently used between 
about 1830 and 1850 17 
3. Peck's figure of the plum curculio, published with his description 
(Rhynchsenus cerasi) in 1819 ' 17 
4. Map showing by the shaded area the distribution of the plum curculio. . 25 
5. The apple curculio (Anthonomus quadrigibbus) 28 
6. The plum gouger (Anthonomus scutellaris) 28 
7. The acorn weevil (Balaninus victoriensis) 29 
8. Fuller's rose beetle (Pantomorus fulleri) 29 
9. Imbricated snout beetle (Epicxrus imbricatus) 29 
10. The plum curculio ( Conotrachelus nenuphar) : Egg 30 
11. The plum curculio: Larva, showing structural details 30 
12. The plum curculio: Head of larva, with parts named 31 
13. The plum curculio: Head of larva, lateral aspect, with parts named.. 31 
14. The plum curculio: Head of larva, ventral aspect, with parts named. . 31 
15. The plum curculio: Lateral, dorsal, and ventral aspects of right man- 
dible of larva, with muscles 31 
16. The plum curculio: Dorsal aspect of maxilla and labium of larva, with 
parts named 32 
17. The plum curculio: Pupa, showing structural details 32 
18. The plum curculio: Mouth parts of the adult 33 
19. Black-knot of plum, showing, on the left, infestation by plum- 
curculio larvae 37 
