198 



DISEASES OF THE ROSE. 



saw-fly. The little insect alluded to has been mistaken for a 

 species of Thrips or vine-fretter : it is, however, a leaf-hopper, or 

 species of Tettigonia, much smaller than the leaf-hopper of the 

 grape-vine ( Tettigonia Vitis), and, like the leaf-hopper of the bean, 

 entirely of a pale-green color." Harris. 



20. TENTIIREDO PAVIDA. Linnceus. The larvae of both these last are 



very injurious to rose plants. 



2 1 . TENTIIREDO USTULATA. Linnceus. The real tenthredo j and has 



not been ascertained to be injurious to roses. 



22. TENTHREDO CINCTA. Linnceus. The larvae of this insect are found 



upon the leaves of rose-bushes in autumn, and the perfect insect 

 bores holes in the stem. 



23. TENTHREDO CYNOSBATI. Linnceus. 



24. TENTHREDO ANNULATA. Linnceus. The larvae of both of these are 



found on the leaves of the Rose. 



25. TENTHREDO of Merat, see page 000. 



Of all the insect enemies of the Rose, the Tenthredo tribe is the 

 most injurious. After they reach the larvae state they bury 

 themselves in the ground to undergo their metamorphosis, from 

 which the perfect insect does not emerge till the following year. 

 The Bedeguar ichneumon of some authors is the same as No. 15. 

 The Diplolepe bedeguar of Geoffrey, is also a synonyme of the 

 same. 



26. APIS MELLIFJCA. Linnceus. The honey-bee. This species, like 



many others of its family, is frequently found upon every kind 

 of rose, either drawing out with its proboscis the honeyed treasures 

 secreted in the nectarium, or gathering with its feet from the 

 stamens the pollen for its wax. 



27. MUSCA PELLUCEUS. Linnceus. This fly, according to Geoffroy, 



also lives upon rose-bushes. 



28. MUSCA NIGRA. Linnceus. Similar to the preceding. 



29. ACARUS CROCEUS. Linnceus. According to Linnaeus, this insect 



lives on the Rosa Monstrosa, sucking the sap from its stems. 



30. Coccus Ros^:. Merat. A species of caterpillar, infesting the 



bark of roses. It has a white shell, very thin, irregular, and 

 gathered in such a manner as to cover the part it attacks, which 

 is generally near the point of the stem. Merat has not yet suf- 

 ficiently distinguished the habits of this insect to describe it with 

 precision, but thinks it would destroy the plant upon which it 

 . happened to be in very great numbers. Its destruction is easy, 

 by merely scraping the scales with the back of a pruning-knife. 



