52 



REPORT OF THE STATE ENTOMOLOGIST I92I 



Percentage of wheat straws infested with Hessian fly puparia for 1918 



Per cent infestation 



County 



No. 

 localities 



No. fields 



examined Maximum Minimum 



Alleghany. . . 

 Cattaraugus . 



Cayuga 



Chautauqua . 



Columbia 



Cortland .'.'.'. 

 Dutchess .... 



Erie 



Genesee 



Livingston . . . 

 Madison. . . . 

 Montgomery. 



Monroe 



Nassau 



Niagara 



Oneida 



Onondaga . . . 



Orleans 



Rensselaer. . . 



Schuyler 



Seneca 



Steuben 



Suffolk. 



Tompkins. . . 



Wayne 



Westchester . . 



Wyoming 



Yates 



I 

 2 



II 

 6 

 4 

 2 



II 

 3 

 3 

 3 

 3 

 5 



14 

 5 

 S 

 2 

 4 



18 

 2 

 2 

 5 

 6 



23 

 8 



II 

 I 

 3 



36 



86 



33 



17 



4 



6.06 

 12 

 36 



2.17 



4 



"2. 86 



1.1 



2.63 



233 



2.7 

 2.94 

 2.86 

 2.86 



Average 



1.67 



.86 



1.05 



1-47 



.42 



.84 



.17 



1.73 



1. 19 



1. 19 



1.06 



.28 



1.78 



I 



.67 



2 



•57 



3 



• 73 



5 



•Qi 



5-71 



6.67 



5-71 



4 



4 



8 



3-13 



4 



3 33 



3-33 



2.S9 

 2.56 

 I.I 

 •3 

 1.28 

 2.07 

 1. 75 

 1.82 

 1. 81 



It will be seen by comparing the above data with those obtained 

 in 19 1 9, that there was a material increase in the abundance of this 

 insect, particularly in Genesee, Livingston and Monroe counties. 



Percentage of wheat straws infested with Hessian fly puparia, 1919 



Infestation 



County 



Cayuga 



Cortland. . 



Erie 



Genesee . . . 

 Jefferson. . 

 Livingston . 

 Monroe. . . 

 Niagara . . . 

 Onondaga . 



Ontario 



Orleans 



Oswego 



Schuyler . . . 

 Tompkins . 

 Wayne. . . . 

 Wyoming . . 

 Yates 



No. 



No. fields 



Max. 



Min. 



Average 



localities 



examined 



No. 



No. 



per cen t 



8 



8 



18 



1 



9-39 



2 



5 



6 



1 



4-39 



3 



8 



4 



1 



3-87 



15 



28 



58 



1 



15.77 



I 



1 



2 . . 





4.00 



11 



19 



44 



1 



5-91 



13 



20 



50 



1 



12.24 



10 



10 



16 



1 



7.48 



6 



8 



18 



1 



7-83 



5 



7 



3 



1 



3-43 



6 



8 



14 



1 



5-79 



3 



6 



3 



2 



2. 



I 



3 



I 





.67 



2 



4 



2 



1 



450 



II 



16 



32 



1 



10.38 



4 



10 



6 



1 



2.98 



8 



13 



4 



1 



3 26 



Supplementary data were also obtained from a number of the 

 less important grain-producing counties and these are given below. 



Hessian fly in wheat and barley; supplementary data, 1919 



County 



Frank'in 



Jefferson 



Ontario 



Orleans 



Tompkins 



St Lawrence 



No. felds No. straws 

 examined examined 



7 



175 



•3 



6 



375 



22.5 



I 



50 



6 



I 



50 



12 



I 



25 



12 



7 



400 



1.2 



Average 

 per cent 

 infestation Grain 



Spring wheat and barley 



Spring wheat and barley 



Winter wheat 



Barley 



Winter wheat 



Spring wheat and barley 



