-8- 



3, Supply , moderate. Cost, around sfl.40 - vl».50 a pint, 



4, Concentration for spraying, 1 pt, - 100 [.alSo 



5, Properties: Contains a bit of mercury and should not be used on 



apples beyond mid-Jun*;» Equal of dry wettable sulfurs for 

 protection of fruits and foliage against apple scab and black 

 rot, up to mid or late June only. Burns out scab spots pn im- 

 mature leaves nearly as vvell as liquid lime-sulfur and usually 

 v/it;iout appreciable injury, V/hen combined v/ith lead arsenate 

 the spray sometimes causes spotting aiid jfellov.ing of older leaves 

 of apples, dtimagc rather characteristic of arsenical injury. Not 

 compatible with lime, Compatability v/ith sulfur questionable. 

 No bettor than sulfur for cedar-apple and quince-rust control, 



6, Best Use s; (1) In first or second cover spray to eradicate scab . 



frdni leaves, (2) If cost isn't a factor, in pink, calyx and 

 first cover as both protectant imd eradicant, v/ith sulfur or 

 sulfur plus Formate in remainder, (3) In post-rain spray to 

 head-off or prevent scab (but length of period for this "kick- 

 back" action not definitely knov»-n). Use of spreader (but not a 

 calciuju caseinate) mi^^ht improve it v;hon used as an eradicant spray, 



PHYGON 



1, phy sical , Chemic a l t A br'->vmish-yellow powder containing dl% 2,3, 



di'ch'lOro- 1 , 4-naphthoquinone , Forras true suspension in water. 



2, Supply, limited. Cost around !;;,2,00 per lb, 



3, Formulas ; 3/4 to 1 lb, -100 is standard, although both concentrations 



may cause light to marked injury v^n apples, 



4, Properties ; Compatible v;ith all standard sumaer spray materials 



except oils. Highly effective at 3/4-100 in preventing apple 

 scab and black rot, but is only poor to moderate for burning 

 out scab spots. At 1-100, effective against black rot and bitter 

 r'">t -.if apples, and spur blight of raspberries (suiiimer sprays on 

 nevif canes - see under Formate). Injury to apples includes dwarfing, 

 yellowing and sometimes dropping of loaves, and spotting and re- 

 duction is size of fruits. The diluted spray is caustic to the 

 hands and face of some op»-;rators, 



5, Best Usos; (1) As alternative for Formate on raspberries, at 1-100, 



(2") For small scale trial on apples for scab control; not stronger 

 than 1/2 lb, -100, in pinlc, calj-^x and first cover spray using sulfur 

 or Fermate and sulfur mixture (see under Fermate, 4) in pre-pink, 

 bloom and later covers, (3) if cost is not important, use as in 

 (2) except throughout the pro-pink to third cover spray inclusive 

 follrwed by sulfur or sulfur- Fermate mixture in last cover. 



0. C, Boyd 



