

157 



The production rate of about 5,058,000 weevils per week in 1976 increased to 

 6,243,000 weevils per week in 1977, after antimicrobial agents were added to 

 the sand. Fewer than 1% of the trays had microbial contamination in the 1977 

 tests. Our results are conclusive that large numbers of boll weevils can be 

 reared in the laboratory with currently available equipment and technology. 



300. , and Roberson, J. 1980. New and improved techniques for mass 

 rearing boll weevils. Southwest. Entomol. 5- 165-168. 



A new system was developed for handling rearing trays for planting through 

 adult emergence of mass reared boll weevils, Anthonomus grand is grandis 

 Boheman. Use of the new system resulted in reducec cost for equipment, and 

 considerable savings in time and labor for handling and allowed for fumiga- 

 tion of each development and emergence unit after each production cycle. 

 Experimental results indicated that the yield of adult weevils with the new 

 system was equal and possibly superior to that obtained with the standard 

 system. 



301. ; Roberson, J.; and Malone, 0. L. 1980. Boll weevil development in 

 mass rearing: Effects of temperature. Environ. Entomol. 9: 72-74. 



This study was made to determine whether a temperature could be found that would 

 causo: laboratory (mass) reared boll weevil, Anthonomus grandis grandis Boheman, 

 to develop at an uniform rate (85% or more of insects pupated at the beginning 

 of adult emergence) from eggs to adults in 11-12 days and to obtain an 85% or 

 larger emergence of adults during a 3 day or less period but not have a decrease 

 in yield of weevils. Three tests were conducted in which 7 developmental-period 

 temperature regimens were used. When the rearing-medium temperature was held 

 constant at 30.0°C for the entire development period (egg to adult stage), the 

 total development period was 2 days shorter than with the other temperature 

 regimens studied, but the yield of adults was lower than with some of the other 

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