101 



result in injuries to the leaf which cause it to curl slightly 

 and to show all over the surface fine streaks of a light 

 colour. 



red spider (Tetranychus telarius, L.) Acarina. 



Red spider (Fig. 114) also lives on the under surface of 

 the leaves, and, when very abundant, on the upper surface 

 as well. The red spider forms a very fine web under which 



I a \ 



Fig. 114. A red spider. 

 (a) adult; (6) ]]aljnis ; (c) claw. Enlarged. {From U. S. Dept. Agric.) 



most of the mites live. The feeding of these mites results 

 in a considerable amount of curling of the leaves, and in 

 producing a russet appearance on leaf-stalk and vine. 



Thripsand red spiders are both very small in size, but 

 they can be easily distinguished. Thrips are long and 

 narrow ; they never have more than six legs, and the 

 adults are winged. The red spider has a comparatively 

 short and broad body. The adults possess eight legs, 

 and are never winged. The presence of a web is also an 

 indication of the presence of red spider. 



Control. Flea beetle does not often occur in such 

 numbers as to require the application of insecticides 

 The use of Paris green and lime, or lead arsenate 



