INSECTS INJURIOUS TO POTATOES AND TOMATOES 277 



bollworm (see pages 168 and 221), under which names their habits 

 and life histories have been fully described. 



Obviously tomatoes should not be planted on land which has 

 been in corn or cotton infested by this insect the previous year, 

 unless it has been given thorough winter plowing and harrowing. 



It has seemed to the writer that trap rows of sweet corn might 

 be used for protecting tomatoes as they are used with cotton, but 

 no experiments seem to have been conducted which show the prac- 



FIG. 237. Bollworm boring into green tomato. (After Quaintance and 

 Brues, U. S. Dept. Agr.) 



ticability of the method. As the young caterpillars feed a little on 

 the foliage before boring into the fruit, a thorough spraying with 

 arsenate of lead, 3 pounds to 50 gallons, will undoubtedly protect 

 the tomatoes if applied as soon as the eggs are laid, and with one 

 or two later applications at intervals of ten days, the exact time 

 depending upon the latitude and season, as indicated by the life 

 history (see page 168). 





