816 Popular Editions of Station Bulletins of the 



The grape leaf-hopper is about one-eighth of an 



The inch long, light yellow during the summer, but 



insect. changing to salmon color toward fall and becoming 



dark red in its winter hiding place. One of the 



adults is shown on page 819 and five iiymphal stages or 



" instars " in the adjoining 

 figures. These differ from 

 each other mainly in the in- 

 creasing prominence of the 

 wing pads ; since the hoppers 

 do not pass through larval, 

 pupal and adult forms which 

 differs so markedly in most in- 

 sects. The adult hoppers have 

 a front, or outer, pair of wing 

 shields, or " elytra ", which 

 close along the back, making a 

 tight, tent-like cover beneath 

 which the thin, filmy, true 



Fig. 1— First Four Ntmphal Instars of wings are concealed when the 

 Grape Leaf-Hopper. • , . ' n- •> . 



(Enlarged.) lusccts are not m night. 



The protection given the little pests by 



these resistant wing covers makes it very 



difficult to injure the adults by spraying, 



since the ordinary mist spray does not 



reach any tender part of the body. Both 



old and young " thrips " are still further 



protected by their habit of feeding on the 



under side of the leaves, so that, to combat 



them successfully, driving sprays must be 



used that catch them from below and 



drench them thoroughly. 



The adult hoppers winter in protected Fig. 2— Fifth Ntmphal In- 



places about the vineyards, weeds, piles of '^^" ''hS'per^ ^''^^' 



rubbish, ditch banks or other neglected (Enlarged.) 



corners of the vineyards themselves or woodland, 

 undergrowth or grass lands adjoining them. They 

 appear before the grape foliage has started and 

 feed for a time on early spring weeds or other 



Time of 

 feeding. 



