If you apply dust by airplane, limit 

 the swath width to the plane's wingspan, 

 or not more than 40 feet. Flag or 

 mark the swaths to insure thorough 

 coverage. 



If the dust is likely to drift into fields 

 of alfalfa or other crops that would be 

 made unsalable by presence of a hydro- 

 carbon-insecticide residue, apply Di- 

 brom, malathion, or methyl parathion. 



Dust applications are usually more 

 effective if made in early morning or 

 late afternoon. In desert regions, do 

 not make applications after 10 a.m. or 

 before 4 p.m. 



Do not apply dust when wind velo- 

 city exceeds 4 or 5 miles an hour. 



Spraying 



Spray materials for use on cotton 

 usually are formulated as emulsifiable 

 concentrates. When mixed with water, 

 they form emulsions that are easily 

 applied with aircraft or ground equip- 

 ment. 



Before preparing a spray, determine 

 the amount of spray your equipment 

 dispenses per acre at a given speed. 

 Mix the concentrate with enough water 

 to insure that the proper amount of 

 active ingredient will be applied to each 

 acre. For example: If your spray ma- 

 chine delivers 8 gallons of spray per 

 acre, and the recommendations specify 

 4 pints of concentrate per acre, you 

 should mix 4 pints of concentrate with 

 7V2 gallons of water to make 8 gallons 

 of finished spray for each acre to be 

 sprayed. 



If you spray by aircraft, use nozzles 

 that produce droplets of 100 to 300 



BX-13917-X 



Damage to cotton plant that was exposed to 

 lygus bugs for 7 weeks under a screen. 



microns. Flag the flights; make 

 swaths overlap. Do not spray by air- 

 craft when wind velocity exceeds 8 

 miles an hour. 



If you use a ground machine, one 

 properly adjusted nozzle for each row 

 will put enough spray on plants in the 

 early fruiting stages to give control. 

 When plants are larger, use two or 

 three nozzles per row. Set the nozzles 6 

 to 9 inches above tops of the plants. 

 Apply 2 to 10 gallons of spray per acre, 

 at about 60 pounds pressure. Adjust 

 dosage to the size of plants; largest 

 plants require maximum dosage. 



With ground machines, you can 

 apply sprays effectively in winds up to 

 15 miles an hour. 



