THE EUROPEAN CORN BORER AND ITS CONTROL. 35 



Second Generation. 



Incubation Period. 



The eggs are deposited in masses on various parts of the food plant 



selected for oviposition. They hatch, on an average, in 6 days, with a 



maximum of 8 and a minimum of 4 days (see Table VIII). Duration of 



the incubation period depends upon temperature conditions. 



Table VIII. — Duration of Incubation Period — Second Generation. 



Observation Number. 



201 

 202 

 203 

 204 

 205 

 206 

 207 

 208 

 209 

 210 

 211, 

 212, 

 213, 

 214, 

 215, 

 216, 

 217, 

 218, 

 219, 

 220, 

 221, 

 222, 



Number of 

 Eggs. 



Deposi- Hatch- 

 tion, 1918. ing, 1918. 



July 

 July 

 July 

 July 

 July 

 July 

 July 

 July 

 July 

 July 

 July 

 July 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 



Aug. 2 

 Aug. 2 

 Aug. 3 

 Aug. 3 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 6 

 Aug. 7 

 Aug. 7 

 Aug. 7 

 Aug. 8 

 Aug. 7 

 Aug. 8 

 Aug. 8 

 Aug. 9 

 Aug. 9 

 Aug. 12 

 Aug. 12 

 Aug. 14 

 Aug. 14 

 Aug. 15 

 Aug. 15 

 Aug. 16 



Duration of 



Incuba- 

 tion Period 

 in Days. 



