VEGETABLE INSECTS. 



273 



hind legs specially fitted for jumping. As soon as the vegetation 

 on which they are feeding is disturl)ed they iiop into the air in small 

 clouds, and fly off to nearby ])lants. 



They cause damage by sucking the plant juices from the foliage, 

 thus sapping the vitality of the plant and often causing the leaves 

 to cuii and dry up. Tlicy attack a great variety of vegetables, and 



although most 

 of them prefer 

 n e particular 

 plant, some of 

 tliem will attack 

 a great number. 

 This is particu- 

 Jarly true of the 

 apple leaf hop- 

 per, Empoasca 

 inali, but this 

 pest will be dis- 

 cussed in greater 

 detail as a pest 

 of the bean. 



Gomtrol. — 

 Ij e a f h oppers 

 Iieing sucking 

 insects cannot be 

 poisoned, but 

 nnist be hit with 

 a contact spray 

 in order to kill 

 them. A soap 

 and nicotine sul- 

 phate spray as 

 described on 

 page 268 is ef- 

 fective in kill- 

 ing a large num- 

 ber of then if properly applied. The spray should be applied as 

 fine as possible and 1o the undersides of the leaves. Sticky surfaces 

 may also V.q u.sed very effectively in catching the hoppers. These 

 should he carried along tlie i-ows of plants, and the hoppers caught 

 as they fly up ( n lieing disturbed. 



Fig. 2S.^ — Nematodes (Heleroclera radicicola) . Showing 

 the ijodulea ] icjiiiurcl on eclt-iy n.i ; . 



