3. Remove nozzle tips and screens. Clean them in kerosene or 

 detergent solution, using a soft brush. Do not use a knife, wire, 

 or other hard material to clean nozzle tips. The finely-machined 

 surfaces of the tips can be easily damaged, causing distortion of 

 the spray pattern and an increased rate of application. 



4. Fill the tank about half full of water and add about 1 

 pound of detergent for every 50 gallons of water. 



5. Operate the pump to circulate the detergent solution through 

 the sprayer for about 1/2 hour, then flush it out through the boom. 



If you have used 2,4-D or an organophosphorous insecticide, be- 

 fore doing step 6, follow these additional procedures: 



a. Replace the screens and nozzle tips. 



b. Fill the tank about half full of water and add 1 pint of 

 ammonia for every 25 gallons of water. 



c. Operate the pump to circulate the ammonia solution through 

 the sprayer for about 5 minutes, and discharge a small 

 amount through the boom and nozzles. 



d. Keep remaining solution in the sprayer overnight. 



e. In the morning, flush out all the ammonia solution through 

 the nozzles by operating the sprayer. 



6. Fill the tank about half full of clean water while hosing 

 down both the inside and outside, then flush out through the boom. 



"When finished with the sprayer for the season, remove and store 

 the nozzle tips, strainers and screens in light oil. Store the 

 sprayer in a clean, dry shed. If the pump cannot be drained com- 

 pletely, store where it cannot freeze." 



*************** 



A SUBSTANCE THAT DETERS EGGLAYING BY APPLE MAGGOT FLIES 



Ronald J. Prokopy 

 Department of Entomology 



In the preceding 2 issues of Fruit Notes, I have discussed 

 how apple maggot flies locate food, mates, and egglaying sites and 

 how this information can be put to practical use in developing traps 

 for monitoring and (in small orchards) possibly even controlling 

 maggot fly populations. In this article, I will discuss a unique 

 sort of behavior engaged in by the apple maggot and its close rela- 

 tives just after egglaying. The fly-originating chemicals associated 

 with this behavior offer promise as a new means of controlling the 

 apple maggot without insecticides in large orchards. 



