50 



NEW YORK STATE MUSEUM 



Wheat midge in rye fields 



Analysis of samples June i8, 191 8 



Large heads . . . 

 Spikelets . . . . 



Grains 



Grains, max . 

 Maggots. . . . 

 Below max . . 



Medium heads . 

 Spikelets . . . . 



Grains 



Grains, max . 

 Maggots. . . . 

 Below max . . 



Small heads. . . . 

 Spikelets . . . . 



Grains 



Grains, max. 

 Maggots. . . . 

 Below max . . 



White heads . . . 

 Spikelets. . . , 



Grains 



immature . 

 Maggots . . . . 



Total andper cent 



EAST SCHODACK NO. I EAST SCHODACK NO. 2 



No. and 

 per cent 



8i 



112 

 162 

 29 



31% 



68 

 71 

 136 

 45 



48'-; 



66 



43 



132 



5S 



67'; 



61 



38 



189 



Per cent crop 



Loss Class 



St. 6 



No. and 

 per cent 



75 

 70 

 150 

 41 

 53 < 



80 

 76 

 160 



85 



Per cent crop 



Loss Class 



NORTH CHATHAM 



No. and 

 per cent 



46 

 65 

 92 

 10 



29% 



66 



74 

 132 

 23 



44' 



66 

 39 

 132 



Per cent crop 



Loss Class 



14 



East Schodack field no. i was very badly infested, no. 2 showed 

 only a moderate infestation and the North Chatham field still less. 

 The last was considered one of the best looking pieces of rye in that 

 section. 



Attention is ca'.led first of all to the varying percentage of large, 

 medium, small and white heads in these three fields. The percentage 

 of the last was low except in the Schodack field no. i , while the marked 

 difference between the Schodack field no. 2 and the North Chatham 

 field is in the percentage of small heads. 



The maximum grains possible are double the number of spikelets 

 and the reduction from the maximum in each case is calculated by 

 taking the difference between the maximum grains and the actual 

 niimber and figuring out the percentage for the group and then the 

 percentage reduction for the entire crop, this latter appearing by 

 itself in the column marked Crop percentage, loss. It should be 

 remembered that a maximum yield is very rarely obtained and that 



