WAC 16-230-640   Use restricted herbicides -- Eastern Washington -- Weather and temperature conditions.  Use restricted herbicides shall not be applied on and after April 1 through October 31 of each year when there is a temperature inversion; or throughout the year if weather conditions are such that damage could result to adjacent and nearby towns, susceptible crops and plantings through physical drift or volatilization, or the temperature is 85°F. or above at the point of application: Provided, That application at the rate of fifty gallons or more per acre using nozzles having a minimum orifice diameter of .072 inches shall be exempt from the 85°F. temperature cutoff requirement: Provided further, That when using the invert system, applications may continue up to 95°F. with a maximum wind velocity of fifteen miles per hour and with water carrier at twelve or more gallons per acre.



[Statutory Authority: Chapters 17.21, 15.58, and 34.05 RCW. 07-11-041A, § 16-230-640, filed 5/9/07, effective 6/9/07. Statutory Authority: Chapters 15.58 and 17.21 RCW. 88-05-033 (Order 1965), § 16-230-640, filed 2/12/88; 87-09-015 (Order 1923), § 16-230-640, filed 4/6/87; 80-03-041 (Order 1680), § 16-230-640, filed 2/20/80.]