DISEASES OF THE ROSE. 193 



careful observation of their habits and modes of life, especially 

 while in their larva state. It is highly desirable that amateur 

 cultivators should devote more time to the study of Entomology, 

 for upon an intimate acquaintance with the habits of these 

 minute depredators depends, in a greater degree than is gene- 

 rally supposed, the success of cultivation. Our own leisure is so 

 limited, that we have been able to devote very little time to this 

 subject ; and we can find no work that ■ treats in detail the in- 

 insects that attack the Rose. With this paucity of material, 

 we simply give a list of the principal, in the hope that some 

 one will improve upon it. Our authorities are mostly Euro- 

 pean, and some of the varieties we name may not exist in this 

 country. 



1. ScA|!.AB.EUs AURATUs of Lhinceus, or Cetonia aurata of modern au- 



thors, sometimes called the golden fly. This insect causes a 

 cessation of growth in the plant, and may be easily destroyed 

 by tobacco smoke. 



2. Melolontha vulgaris. — Fabricius. Common May-bug. It is some- 



times found upon the leaves of the rose-bush, but quite as fre- 

 quently upon those of many other plants. 



3. Chrysomela bipukctata. — Linnaus. It is found on the rose-bush 



occasionally, and does it no injury. 



4. BupRESTis manga. — Linncms. This, like the preceding, is a Cole- 



optera, and is only found occasionally on the Rose. 



5. Cicada spumaria. — Linnaus. This insect is found on various 



plants, and not exclusively on the Rose. 



6. Cicada Ros.e, or Jassus Ros.c — Fabricius. This insect, commonly 



known as the rose-grasshopper, lives upon the Rose during its 

 three states, and injures it by draining the plant of its sap. 



7. Aphis Ros.^. — Limmus. Green Fly. This insect is a scourge to 



roses, from the facility of its reproduction, and its numerous pro- 

 geny sometimes entirely cover the leaves, the young sprouts, 

 and the flower-buds. Devouring the sap, they are very injurious, 

 and, when numerous, sometimes destroy the plant, while they 

 soil every part on which they collect. The most common species 

 is of a pale green, but there is a variety of a dingy yellow. In 

 Europe they are commonly called vine-chafers. Their principal 

 destroyers are small birds, but they have other enemies, as many 

 small hymcnopteres of the genus Chalcis and Cynips^ and espe- 



17 



