TWENTY-FIRST REPORT OF STATE ENTOMOLOGIST 



15 



CORN 



•mon Name 



Plant lice 

 Corn earworm 



Cutworms 



Scientific Na^ie 



Aphididae 



Heliothis obsolete, Fab. 



Noctuidae 



Localttt 



Billings 



Billings 



Victor 



Winnett 



Malta 



Culbertson 



Broadus 



Date 

 1925 1926 



Mar. 2 



Mar. 18 



July 29 

 Sept. 30 

 Oct. IS 



Apr. 21 



May 29 



The corn earworm was reported only once in 1925 and three times during 1926 

 in widely scattered localities and it is hoped that, as our new industry of corn 

 raising develops, this earworm will not develop into such a serious enemy of corn 

 as it is in the central and southern States, but the chances are that it will always 

 be one of our major pests of corn. 



POTATO 



Colorado potato beetle Leptinotarsa decemlin>?ata Say 



Cutworms 



Leaf-hoppers 



Wireworms 



Noctuidae 



Cicadellidae 



Elateridae 



Victor 



Simms 



Raymond 



Rothiemay 



Malta 



Helena 



May 23 



May 28 



Sept. 28 



Aug. ■:• 



Aug. 



Aug. 



The old standby, the Colorado potato beetle, as usual does more than its share 

 of damage, although the growers are becoming more and more efficient with their 

 poisoning practices. Wireworms are becoming more of a problem with the growers 

 of certified potato seed. Work is now in progress at this station in an attempt to 

 discover more efficient control practices. 



GREENHOUSE PLANTS 



The number and the wide variation of the insects affecting greenhouse plants 

 were about normal, with no outstanding new pests. 



