8 



BULLETIN" 708, U, S. DEPARTMENT OF AGRICULTUEE. 



begun in August, while the temperature was high and the weevils 

 very active. By the following December all the weevils were dead 

 and dry, none had reached the grain, and no evidence could be 



found that they had 

 attempted to force 

 their way through 

 the shuck protection 

 to the grain. 



As a logical part of 

 this test, some wee- 

 vils were confined in 

 jars with ears of corn 

 from which the shucks 

 had been removed. 

 This part of the test 

 was identical with 

 the first, with the ex- 

 ception that in this 

 case there was no 

 shuck protection. 

 With four or five ex- 

 ceptions, the wee- 

 vils were alive at 

 the final examination 

 and had done a very 

 serious amount of 

 damage to all the 

 ears. 



This test makes it 

 evident that while it 

 seems that these in- 

 sects should be quite 

 able to cut through 

 all of the shuck 

 fact, will not do so. 



Tig. : 



-White Rice pop corn damaged by weevils, 

 eat the hardest corn. 



These insects can 



covering that corn may have, they, in 

 even though they must starve if they do not. 



RESULTS OF INVESTIGATIONS IN 1916. 



On October 6, 1916, at Thomasville, Ga., a quantity of corn was 

 selected from a field and examined for ear damage. The variety in 

 this case was one of those used in the 1915 investigations. As may 

 be gathered from the data, it had a wide range of protective adapta- 

 tion. As the field was located about one-fourth of a mile from places 

 where old infested com was stored, the opportunity for weevil in- 

 festation was very good. The worm damage is believed to have been 

 exceptionally severe. 



