96 



PAPERS ON CEREAL AND FORAGE INSECTS. 



Figure 34 is a plan of the experimental plats and shows very clearly 

 that the attacks of the pod moth were not restricted to any one part 

 of the field, but were more or less promiscuously distributed. The 

 plantings were made on a gentle slope, the upper side being to the 

 south, thus giving a northerly exposure. The vacant rectangle in 

 the center of the plan indicates a wheat-straw stack. All sides of the 

 field were bounded by grain fields, and the roadside was practically 







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73 



80 



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Fig. 34. — Planting plan of plats used in investigations of the legume pod moth during the season of 1910. 



(Original.) 



without weeds of any kind. The plats were separated from each 

 other by strips of oats 1 yard in width. 



Field peas vary greatly in texture of the seed, time of blooming, 

 time of maturing seed, and adaptability to semiarid conditions. The 

 variability, however, is confined to the varieties to a large extent, 

 the individuals of a variety being quite uniform in response to given 

 conditions. This fact at once opened the question of a worm- 

 resistant variety. The results arrived at by this investigation are 

 very suggestive. The actual records made in the investigation are to 

 be found in Table I, but to make the results more readily available the 



