332 



BOARD OF AGRICULTURE. [Pub. Doc. 



Another treatment is to dust the plants while the dew is 

 yet on with a mixture of Paris green, one pound, and plaster 

 or flour, seventy-five pounds, or else with air-slaked lime. 



As tobacco appears to be disagreeable to these insects, 

 considerable 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 cucumber 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, cab- 

 bage root maggot, turnip root maggot, etc. 



Fig. 6. — Ouioii maggot; ailult fly at left; crossed lines lielow, showing iiatuial size. Onion 

 plant at right, showing eggs of fly, and maggot worlting 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 



^-e^ 



^OJ) 



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

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



