- 3 - 



wi-bh Phygon v/as experienced by some growers, Howard Gilmore offers an ingenious 

 "Fay IJountain Method" of overcoming this problem, - "Fill the spray tank v;ith 

 water; then place the bag of Phygon under water and empty its contents". There is 

 nothing gained by first iuaking a slurry of the material. At Vvaltham we dumped the 

 Phygon into the tank. 



It has been claimed that sulfur and lime depreciate the action of Puratized 

 Agricultural Spray. Extensive laboratory and orchard studies indicate that these 

 claims are exaggerated and even doubtful, Puratized and paste sulfur combined 

 performed about the same a? or a little better than Puratized, or Puratized and 

 dry wettable sulfur combined. Puratized and Ferraate combined was highly effective 

 and virtually the same a;j paste sulfur alone. Considering all of our results 

 (small and large scale tests), Puratized with lime, and without, showed no 

 significant difference. Our tabulation of apples for scab is as follov/s: 



Treatment 



Puratized, 1 pint 



Paste Sulfur, 11,75 lbs. 



No treatment 



Puratized, l/S pint 



Paste Sulfur, 5.87 lbs. 



% Scabby Apples 



1.04 



1.0 



0.19 



0.5 



Puratized, 1 pint 

 Lime, 3 lbs, 



Puratized, l/2 pint 

 Kolo Spray, 3,5 lbs, 



Phygon, 1/2 lb, 



Puratized, l/2 pint 

 Fermate, l/2 lb. 



.46 



0,0 



0,0 



1.5 



3,6 



0,3 



The early protectant sulfur sprays should carry at least 6 lbs. of actual 

 sulfur to 100 gallons. For 50^o Paste sulfur the equivalent is 12 lbs, of paste. 

 For 70^0 Paste sulfur the equivalent is 8,6 lbs, of paste. Though some allovance 

 may br; made for the finer particle size, peculiar to paste sulfurs, it is never- 

 theless desirable to provide at least 6 lbs, of sulfur to 100 gallons in the 

 early sprays, , 



— E. F, Cuba 



ARE Vffi COMING TO BIOLOGICAL CONTROL OF PLANT DISEASES? 



Combatting insect pests and plant diseases with living organisms comes under 

 the category of biological control. The action of ladybug predators on aphids, 

 and the Macrocentrus parasites on the larvae of the Oriental fruit moth are 

 examples of insects controlling insects. Employing the "milky disease" against 



