52 



REPORT OF THE STATE ENTOMOLOGIST I92I 



Percentage of wheat straws infested with Hessian flly puparia for 1918 



Per cent infestation 



No. No. fields , • . 



localities examined Maximum Minimum Average 



I I 2.86 1.67 



1 2 4 .86 



6 II 4 2.17 I. OS 



2 6 8 4 1.47 



I 4 2 . 86 .42 



I 2 4 .84 



3-33 .17 



8 2.86 1,73 



3 23 1. 19 



6.4s I.I I. 19 



4 2 . 63 I . 06 



2.17 .28 



8 2.33 1-78 



4 2.7 I 67 



6.06 2.94 2. 57 



12 -z.ib 3.73 



36 2.86 5.91 



S-7I 4 2. 59 



6.67 3-23 2.56 



571 2.78 I.I 



4 23 4 1.52 .3 

 6 8 4 2.86 1.28 



5 II 8 2.22 2.07 



1 I 3 13 1-75 



2 3 4 3-33 1-82 

 2 2 3.33 1. 81 



County 



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 



3 

 3 

 3 

 3 



S 

 14 



4 

 18 



6 



23 



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

 in 1919, 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 



County 



Cayuga 



Cortland 



Erie 



Genesee 



Jefferson 



Livingston 



Monroe 



Niagara 



Onondaga > . . . . i . 



Ontario 



Orleans 



Oswego 



Schuyler 



Tompkins 



Wayne 



Wyoming 



Yates 







Infc: 



ilation 





No. 



No. fields 



Max. 



Min. 



A verage 



localities 



examined 



No. 



No. 



per cen t 



8 



8 



18 





9.39 



2 



5 



6 





4-39 



3 



8 



4 





3.87 



15 



28 



58 





15-77 



I 



I 



2 





4.00 



II 



19 



44 





5-91 



13 



20 



30 





12.24 



10 



10 



16 





7.48 



6 



8 



18 





7.83 



S 



7 



3 





3.43 



6 



8 



14 





5. 79 



3 



6 



3 





2. 



I 



3 



I . . . 





.67 



2 



4 



2 





4-SO 



II 



16 



32 





10.38 



4 



10 



6 





2.98 



8 



13 



4 





3 26 



Supplementaiy data were also obtained from a number of the 

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



Hessian flly in wheat and barley; supplementary data, 1919 



Average 



A'o. fields No. straws per cent 



Co'unly examined examined infestalion Grqin 



Frank'in 7 i7S .31 Spring wheat and barley 



Jefferson 6 375 22 . s Spring wheat and barley 



Ontario t 50 6 Winter wheat 



Orleans. i so 12 Barley 



Tompkins i 25 12 Winter wheat 



St Lawrence 7 400 i . 2 Spring wheat and barley 



