nu i m . I L.AHW>. ' mi » »l,^n i gi » »j] II . i i i iw i j i |n n»»»w!pji»i>w;p ^ »i >» i w »it ti,mm. i j wa^rw^»»r» " » « t »>"" ' i'" 



495 



979. I. ; Dilday, R. H.; and Hartstack, A. W. , Jr. 1979. Boll weevil: 

 relationship of predicted vs. observed peaks of populations to 

 squaring rates of two cotton cultivars. Environ. Entomol. 8: 506-511. 



From 1973 to 1975, two varieties of cotton, Stoneville ST-213, a standard 

 cultivar, and Tamcot SP-37, a short-season cultivar, planted at ca. 50,400 

 plants/ha, in river silt in the Lower Rio Grande Valley of Texas, were samp- 

 led for adults of the boll weevil, Anthonomu s grand is grandis Boheman, and 

 boll weevil larval damage to squares. The predictions of 2 models for the 

 peak emergence of adults of 4-5 generation of boll weevils was then compared 

 to the actual times of peak emergence of weevils in the field. A good rela- 

 tionship was found between the number of days (0-3 days) when adults of F- 

 were actually observed in cotton and when they were predicted based on the 

 time for 98% adult emergence. From computed cumulative squaring, 50% of 

 the squares occurred 4 and 9 days earlier on SP-37 than on ST-213 in 1973 and 

 1974, respectively, and populations of weevils were greater in SP-37 than in 



ST-213 during 2 of the 3 test yr. Reliable data were accumulated from the 



2 

 sampling of 0.25% of the plot area measuring 204 m . 



980. ; Graham, H. M.; Parker, R. D.; and Davis, J. W. 1976. Boll weevil: 

 seasonal patterns of response to traps baited with grandlure in the 

 Lower*"Rio Grande Valley. Environ. Entomol. 5: 403-408. 



From 1972-75, more boll weevils, Anthonomus grandis Boheman, were caught in 

 grandlure traps in the lower Rio Grande Valley from mid-August to mid-September 

 after defoliation, harvest, and stalk and root destruction of the cotton than 

 at any other time of the year. Larger numbers were collected in traps after 

 poor stalk and root destruction in August and early September than after good 

 stalk and root destruction. Good and poor stalk and root destruction is judged 

 b^ the percentage of cotton acres which has been treated in that manner; 100% 



