SUMMAHY OF INSECT CONDITIONS DURING 1921. 



11 



until after the fly- free date in the northern part of the State north 

 of the Missouri River. This was partly clue to the efforts of the 

 Hessian fly campaign and was also due, in part, to the heavy rains 

 which delayed plantings in many localities. South of the Missouri 

 River the rains abated early enough to induce a great deal of plant- 

 ing from one to three weeks before the fly-free date, and very heavy 

 infestation of the Hessian fly was reported about the middle of Octo- 

 ber in this region. Xorth of the river the volunteer grain was also 

 badly infested. 



In Nebraska the Hessian fly was present in rather menacing num- 

 bers early in the spring. By midsummer a rather serious spring 



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Fig. 2. — Geographical distribution of serious chinch-bug infestations in the United States 

 in 1921 : Solid-colored area, very seriously infested ; shaded area, general infestation ; 

 lines limit western and southern known distribution ; dots are records from literature. 



brood was present all over the eastern counties. The September 

 examinations, however, showed that the fly was only present in 

 serious numbers in a few scattering localities. 



On the Pacific coast the fly was reported as less serious than in 

 1920, but much lodging of wheat occurred in the Willamette Valley 

 due to unusual winds where slight fly infestation occurred. 



CHINCH BUG. 



(Blissus leucopterus Say.) 



The chinch bug appeared as a serious pest during the season of 

 1921 over only a small part of its normal range of destructive 

 abundance. The area seriously infested extended in a southwesterly- 



