102 INSECTS OF ECONOMIC IMPORTANCE 



adults and the young ones scarify leaves of onions, 

 eating off epidermis; leaves turn white, wilt and 

 die; very injurious at times. 



Control — Clean culture in fields and around the 

 borders of fields; spray with the tobacco extracts, 

 nicotine sulphate, ^)4 pint to lOO gallons of w^ater 

 and 4 or 5 pounds of soap, preferably whale-oil 

 soap; spray thoroughly and repeat two or three 

 times 4 or 5 days apart ; commence just as soon as 

 thrips are seen. 



OTHER INSECTS INJURIOUS TO ONIONS 



Black onion fly (Tritoxa flcxa). 

 Cutworms (several species). 



TOMATO PESTS 



Cutworms (several species) 



Cutworms sometimes cut off the young plants 

 when first set and destroy much more than thev eat. 

 A spoonful of the poison bait near each plant when 

 first put out will aid in controlling these pests. 



Flea beetles 



The potato flea beetle often attacks tomatoes but 

 may be repelled by thorough and frequent applica- 

 tions of Bordeaux mixture. It should be sprayed 

 on the under sides of the leaves as much as pos- 

 sible. 



The NORTHERN TOMATO WORM ~^ (PhlegcfJiojifius 



quinquemaculata) 



Order — Lepidoptera 



There are two large green caterpillars very simi- 

 lar in appearance that attack tomatoes, one more 



21 Chittenden — Insects Injurious to Vegetables, p. 229. 



