70 



124. , and Smith, D. B. 1974. Effects of droplet sizes on deposition of 

 ULV spray. J. Econ. Entomol. 67: 751-754. 



Results of quantitative deposit measurements from field tests in which ULV 

 spray droplet sizes were used as treatments showed that droplets of 140 urn 

 diain or larger are necessary for reasonably good control of spray drift. 

 The acceptability of this droplet size will be determined by its effective- 

 ness in controlling the boll weevil and other target pests. 



125. ; Smith, D. B.; and Lloyd, E. P. 1966. Application of ultra low 

 volume pesticides with ground equipment. Proc. 1966 Beltwide Cotton 

 Proc.-Mech. Conf., pp. 22-23. 



The results of this experiment allow us to conclude that both the mist blower 

 and the rotary disc may be used satisfactorily to apply ultra-low-volume 

 chemicals with ground equipment. Control of the boll weevil by the two 

 machines was not significantly different. The rotary disc appears to 

 give more uniform coverage across the swath with less drift than the mist 

 blower. 



126. ; Smith, D. B.; and Lloyd, E. P. 1966. A rotary disc device for 

 applying ultra-low-volume (undiluted) pesticides with ground equip- 

 ment. J. Econ. Entomol. 59: 1487-1489. 



A rotary disc device was developed for ground applications of ultra-low-volume 

 (ULV) undiluted pesticides. The applicator consists of 2 rotating discs powered 

 by a small electric motor and a metering nozzle. One applicator is used on each 

 row. Experimental application of ULV azinphosmethyl (2 lb per gallon), applied 

 to cotton with this device at 0.25 lb per acre gave boll weevil, Anthonomus 

 grandis Boheman, control equivalent to standard methyl parathion applied as a 

 water-emulsion spray at 0.5 lb per acre. Particle deposition within the plant 

 and across the swath was compared with a mist blower ULV applicator. Both gave 



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