INSECTS AND INSECTICIDES. 23 



pairs of legs, always located near the head (see figure), whereas 

 the "red spider" (Tetranychus) has three pairs in the young 

 stage and four pairs in the adult, located upon the sides. 

 The body of the Phytoptus is cylindrical, transparent, and 

 long, as compared with the other portions of the mite. From 

 the position of the legs it has to drag its body in walking. 



Kerosene emulsion is considered the most effective wash for 

 winter use. It is very effective when diluted with from three 

 to eight parts of water and sprayed on the infested trees or 

 vines before the leaves start. Trees sprayed with the strongest 

 solution are practically free from this pest. Those sprayed 

 with the weaker solution show very few galls not over one 

 per cent of the number that were on the trees the preceding 

 year. Summer treatment with liquid remedies is of little avail. 

 As soon as the leaves start in the spring they should be liber- 

 ally treated with dry sulphur in the early morning while yet 

 damp with dew; a second and third application as the growth 

 develops will be found effective. 



