216 



showed that the means for boll weevil and Hellothls spp. infestation were 

 negatively correlated with yield, and the highest yields were obtained when 

 boll weevil infestations were held below the economic threshold level (10%) 

 and when Hellothis spp. larval infestations in squares did not exceed 1.17± 

 0.17 SE larvae/100 squares. Numbers of live Hellothis spp. larvae/100 squares 

 can be used readily to determine a treatment schedule that will give a sound 

 pest management program. 



418. ; Taft, H. M. ; and James, W. 1979. Comparir^on of spray nozzles for 

 ground applications for control of cotton insects and spider mites. 

 J. Econ. Entomol. 72: 180-183. 



Fenvalerate applied at a rate of 0.11 kg Al/ha to cotton gave equal control 

 of the boll weevil, Anthonomus grandis grandis Boheman, Hellothis spp., beet 

 armyworm, Spodoptcra exigua (Htlbner), fally armyworm, S. fr t.giperda (J. E. 

 Smith), and cabbage looper, Trichoplusia ni (HUbner) , whether the nozzles 

 were the conventional type (Conejet TX6) , the 8001 low-pressure fan nozzle, 

 or Raindrop®, 33974-(3-23) . Control of the carmine spider mite, Tetranychus 

 clnnabarinus (Boisduval) , with monocrotophos and American Cyanamld AC-85,258 

 (mitrllacard 1:1 complex with zinc chloride) applied with Raindrop 33974 (5-23) 

 nozzles was statistically equal to that obtained with conventional nozzles. 

 AC-85,258 was phytotoxic when applied with Raindrop 33974 (5-23) nozzles. 

 An LD-^ dose for the boll weevil was found at various distances downwind in 

 relation to the type of spray nozzle used and height above plants. The 

 only significant difference between the conventional and Raindrop nozzle 

 33974 (3-23) occurred when these were raised to 107 cm above the cotton plants. 



419. ; Taft, H. M. ; James, W. ; and Jernigan, C. E. 1970. Evaluation of 

 substitutes for DDT in field experiments for control of the bollworm 

 and the boll weevil in cotton: 1967-69. J. Econ. Entomol. 63: 848-850. 



