87 



less time is needed to drain and clean the system; (6) less material is re- 

 quired to make the spray system operable; (7) there are fewer operating parts; 

 and (8) the spray system can be calibrated to apply the required dose before 

 the plane is flown. 



161.' ; Scott, W. P.; Davich, T. B.; and C. R. Parencia, C. R. Jr. 1966. 



Control of the boll weevil on cotton with ultra-low-volume (undiluted) 



technical malathion. J. Econ. Entomol. 59: 973-976. 

 Applications of ultra-low-volume (undiluted) technical malathion at 8, 12, and 

 16 fluid 02 per acre (about 10, 15, and 20 actual oz per acre) from a J-3 

 Piper Cub flying 15 feet above the cotton in 75-foot swaths were as effective 

 against the boll weevil, Anthonomus grandis Boheman, as the standard applica- 

 tion of methyl parathion (0.4 lb per acre in 2 gallons of water applied in 

 37.5-foot swaths from a plane flying in the conventional manner directly above 

 the cotton). Populations of bollworms, Heliothis zea (Boddie), were not suffi- 

 ciently large to allow evaluation of the control achieved by the A treatments. 

 Numbers of boll weevils found in surface woods trash in the fall and spring 

 near treated fields were reduced considerably by fall applications of technical 

 malathion, compared with areas that received no late treatment. The popula- 

 tions o*! overwintered weevils found in cotton planted in 1965 in the area 

 treated in the fall of 1964 were also considerably reduced over that found 

 in an area that had received no treatment. 



162. Coakley, J. M. ; Maxwell, F. G,; and Jenkins, J. N. 1969. Influence of 



feeding, oviposition, and egg and larval development of the boll weevil 

 on abscission of cotton squares. J. Econ. Entomol. 62: 244-245. 

 The results obtained with implantation of larvae and with injection of water 

 homogeraates of 2nd and 3rd-instar larvae demonstrated that these 2 larval In- 

 stars caused the reaction in the plant that resulted in abscission of the 



