24 PAPERS OX THE COTTOX BOLL WEEVIL, ETC. 



above records show in a striking way. based upon extensive counts, 

 the difference in amount of infestation during early summer where 

 stalks have been destroyed the previous fall. 



CROP ROTATION. 



The value of the rotation of crops was strikingly shown by the dif- 

 ference between the number of weevils occurring on the experiment 

 station variety plats at the college barn, where cotton had been planted 

 the previous year (1902), with corn adjoining, and our plats, situated 

 a mile distant on land which had never been in cotton, havino- o-rown 

 sorghum in 1902. tho cotton was grown not 100 yards distant. The 

 cotton was planted April 5 at the college barn, and on June 17 there 

 were 5 weevils to tOO stalks, 2 being found on the ttO stalks examined, 

 whereas on the other field there were but 0.5 to 100 stalks, only o 

 being found on 940 stalks examined. Again, on August 13 the varie- 

 ties at the barn, planted May 3, had 233 weevils to 100 stalks, 163 

 being found on 70 stalks, while only 5.5 to 100 stalks occurred in the 

 field where there had been no cotton the previous year, onh^ 10 being 

 found on 180 stalks from all parts of the field. On the same day 48 

 weevils to 100 stalks were found on Mr. James Boyett's cotton, just 

 across the railroad from our field, his land having been in cotton the 

 previous year, while on Mr. Suber's cotton, a mile distant, 53 to 60 

 per 100 stalks were found, this crop also following- cotton.^ 



WHERE THE WEEVILS FIRST APPEAR. 



It has been frequently observed in all parts of the State that the 

 weevils first appear on the cotton field along the side adjoining wood- 

 land, if there be any timber adjoining. From the extensive reports 

 of observers thruout the State there seems to be no doubt that cotton 

 in timbered sections is much more seriously injured by the weevil 

 than that on prairie land, owing to the more successful hibernation in 

 the timber. It has also been observed by many that the weevils first 

 appear and commence to be injurious in that part of the field where 

 they were most abundant daring the previous year. In southern 

 Texas the weevils may be found on stubble cotton very early in the 

 season; in fact practically all winter. Thev hardh^ seem to hibernate 

 in the strict sense of the word, as under such conditions the}' are 

 found feeding on warm days practically thruout the winter. 



Upon emerging from hibernation the majority of the early weevils 

 seek the earliest cotton, which ma}' be either stubble cotton or planted, 

 and they will be found more abundantly upon it than elsewhere, even 

 tho the early cotton forms but a very small part of the acreage on a 



« The same value of rotation has been noted by Mr. Louis Teltschick at Vienna. 

 (See Mally, Report on Boll Weevil, 1902, p. 66, paragraph 4.) 



