38 



As tobacco appears to be disagreeable to these insects, consid- 

 erable success has been obtained by applying tobacco dust freely 

 to the ground around the stems of the plants and renewing the 

 application after every rain. 



The cucumber beetle feeds on the squash and melon also, and 

 if a few squashes be planted early around the edges of the cucum- 

 ber field the insect will usually devote most of its attention to 

 them. Spraying cucumber plants with Bordeaux mixture, once 

 as soon as the seed leaves appear, again when the third true leaf 

 develops, and lastly when the plants begin to run, not only makes 

 the plants distasteful to the cucumber beetle but to flea beetles, 

 and protects them from various diseases to which they are subject. 



Root Maggots, 



Under this head may be included the onion maggot, cabbage 

 root maggot, turnip root maggot, etc. 



Fig. 5. — Onion maggot: adult fly at left; crossed lines below, showing natural size. 

 ■Onion plant at right, showing eggs of fly and maggot working on stem below level of 

 ground. 



The adults of these maggots are flies, somewhat smaller than 

 the house fly, which appear in spring and lay their eggs on the 

 roots of the young plants. These eggs are smooth, white and 

 large enough to be seen by the eye. Upon hatching, the little 



J % 



€MIl> 



oco 



Fig. 6. — Eggs of onion maggot nitural size and enlarged, at left; maggot natural size 

 and enlarged, in centre; pupa natural size and enlarged, at right. 



