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rea. No definite, uniform method of determining percentages of infestation in 
scouting work was recommended, Where accurate percentages are desired the above 
nethod or the picking method is suggested, but, owing to the necessity of cover- 
mg considerable territory as rapidly as possible and the practical need of se- 
uring the degree of infestation, only in approximate figures, it was considered 
best to permit individuals to use any reliable method of determining the general 
infestation with which they were most familiar. 
It was planned to determine yield by taking one five-thousandth of an acre 
nm five different places in the plot (total of one one-thousandth acre) to be 
Secured by taking squares of approximately one square yard, In at least one 
place total plots will also be cut and threshed to determine the reliability 
of the smaller areas in comparison, 
INSTRUMENTS, The meteorological instruments to be used at the large ten- 
acre experimental plants shall be as follows; 
Hygrothermograph and Sling Psychrometer, 
Soil Thermograph. 
Two or three Soil Thermometers, 
Set of Maximum and Minimum Thermometers. 
Rain Gauge. 
Anemometer. 
Wind Vane. 
Barometer. | 
In addition, the use of atmometers and radiation thermometers at the 
lafayette station will be continued another year, 
CAGES AND SCREENS, The box cage, consisting of a frame one yard square 
and eighteen inches high, covered with black cloth, wood or roofing material, 
and with a trap to collect issuing flies, seems the most desirable for deter- 
Mining the normal fly emergence. Further studies should be made to obtain a 
cage which will be reliable in showing the natural emergence of flies and which 
Will be practical for use by county agents and others, Studies should also be 
made to determine whether stubble gathered from the field and placed in a cage 
Such as described above will produce flies as normally as in the field. 
Screens made of ordinary wire fly screen are also to be used in determin- 
ing the periods of emergence. These screens shall be two in number and each 
shali be three feet high and ten feet long, set about six or eight inches from 
the ground and placed north and south and east and west respectively. These 
screens to be covered with tanglefoot suitably thinned and examined at least 
Once daily for flies. Our experience indicates that one daily examination is 
EXPERIMENTS. The experiments planned for certain stations in the Hessian- 
y-infested area shall consist of one or more series of sowing plats and one 
major plat of approximately ten acres. At the latter plat experiments shall be 
Hessian fly control, variety tests, effect of various kinds of cultivation on the 
emergence of the fly and the effect of different dates of plowing on the follow- 
ing wheat crop, and the relation to fly control, In addition, a complete set of 
meteorological instruments described above shall be in operation at the major 
plat and studies on the different phases of the life history of the fly made to 
determine the relation of the various meteorological influences. 
It is desirable that "flaxseeds” from each series of sowing plats be 
