6 4 



or nicotine. As I said before, the former is dangerous 

 to use on Roses. Experiments conducted last year 

 showed that strong tobacco wash and soft-soap will kill 

 the nymphs, and this is advised as it does not harm the 

 bushes. 



The tobacco wash is referred to in the last section. 



The Rose Leaf -Hopper (Typhlocyba rosa>). 



Rose leaves are frequently noticed late in the summer 

 to become pale and mottled, or almost marbled (Plate 

 VIII., Fig. 9). On examining the leaves there will be 

 found beneath one or more dried grey insect skins ; these 

 are the cast skins of the Rose Leaf-Hopper (Typhlocyba 

 rosce), an insect which belongs to the same group of 

 Hemiptera as the preceding pest. In warm, dry weather 

 in late summer the damage they do is often very marked 

 and causes the leaves to fall prematurely, and so 

 prevents the proper maturing of the wood. 



This insect has pale yellowish or dull white wings ; 

 the head and thorax are also whitish, and the abdomen 

 also yellow. In length one-seventh to one-sixth of an 

 inch (Plate VIII., Fig. 8). 



LIFE HISTORY AND HABITS. 



These little insects feed upon the leaves, and may 

 be found in May on the Roses. They take flying leaps 

 into the air when disturbed, the movement being con- 

 ducted by means of their longish hind legs. The females 

 place their eggs just under the skin of the leaf, up to 

 four being laid in the leaf together. On the young 

 hoppers hatching they eat their way out and feed on the 

 under surface. These young or larvae are pale yellowish, 

 and before each moult they fix themselves firmly on to 



