FOOD PLANTS. 35 
him to recommend the planting of native plums among other sorts 
more subject to attack for the protection of the latter. In this way 
he believed that the cureulio could be largely exterminated. To 
the conclusions and premises expressed by Mr. Wier, Riley and 
Howard have indicated their dissent in a footnote to the article in 
question and also in their article on the cureulio in the Report of the 
Entomologist for 1887. 
Riley states in the First Missouri Report, page 53— 
That they prefer smooth-skinned to rough-skinned fruit. 
That up to the present time the Miner and other varieties of the Chickasaw plum 
have been almost entirely exempt from their attacks and that in the Columbia plum 
the young larvae are usually drowned out before maturing. 
Under the caption "Plums for the million/' Riley, in the American 
Entomologist, volume 1, page 92, further calls attention to the 
Miner and Columbia plums on account of their freedom from cureulio 
injury. 
Observations by Prof. Gillette in Iowa in 1889 include results of 
studies of varieties of plums as to their attractiveness to the cureulio. 
The following plums were examined and the percentages of injury 
by the cureulio were found to be as stated: 
Ter cent. 
Miner 2. 50 
Wolf 17. 30 
Chickasaw 15. 70 
Forest Rose 13. 60 
Native Seedling No. 1 8. 30 
Native Seedling No. 2 25. 80 
Native Seedling No. 3 5. 20 
Yellow Mira Bell '. 66. CO 
Black Prune 14. 00 
Bier 31.50 
Early Red 19. 00 
The four varieties last mentioned are of the Domestica, or Euro- 
pean type, the others being native. Mr. Gillette, in discussing the 
data, says: 
That of the European varieties an average of 46.8 per cent of all plums were injured, 
the maximum being in the case of the Yellow Mira Bell, the minimum of injury 
being to the Black Prune, namely, 14 per cent. The average injury to native plums 
and varieties was only 6.6 per cent, with maximum in the case of a native seedling. 
The several small trees of Prunus simonii carried their fruit to maturity without any 
signs of cureulio injury. 
Mr. Gillette concludes that this insect has a decided preference for 
the domestica varieties. 
From our own observations we would place Japanese varieties 
(Prunus triflora) and their hybrids atid crosses at the head of the 
plum list, as most susceptible to cureulio injury, and the varieties o( 
