-6- 



PROPERTIES AiN^ USES OF FUNGICIDES ON FRUIT S - 1947 (So many questions 



"Have 'bsen asked abbuT^tlie nev/er spray" and "Hust materials that vie are 



presenting, in this issue, a detailed statement on the nswir Fun gicides , - 



ElbStol, Kronite, Fermate, Karbam, Puratized, and phy^on, prepared by 



0. C. Boyd. In th«-3 next issue, another chapter coverinj^ the older materials, - 



Bordeaux ^ixturo, iTettable Sulfurs, Dusting Sulfur, and Lime-Sulfur will be 



presented, ) 



With the approach of an unusually hazardous season for con- 

 trollinjj diseases of frxiit crops in Massachusetts, due to an abnormally 

 heavjr carryovor of disease organisms, it seems desirable to list the 

 standard and some of tiic newer fung,icidal spray materials, and indicate 

 their outstanding properties and what appears to be tlieir most appropriate 

 uses on fruits in 1947. 



llijBTOL, KRENITB 



1, physica l. Chemical ; Yollov.' organic dj'o in a slurry or thin paste 



emulsion, in 1-gal. cans; containing 34^i of tho sodium salt of 

 dinitro ortho cresol. 



2, Supply, pl ontiful . Cost, around v2.25 to ^'2.85 a gal. 



3, Formulas: 1 l/2 to 2 qts. - 100 on dnnaant peach trees; 2 to 3 qts. 



r00"on apple and poar orchard floor; 4 qts. - 100 on raspberry 

 canes and ground, and on floor of peach orcliard and grape vine- 

 yard. At rate of 500-600 gals, p:jr acre of j^round on floor. 



4, Properties; Aside from use as a strictly dormant tree spray to 



control aphids and bud moth on apples (2 qts.-lOO) and leaf curl 

 on peaches (1 l/2 to 2 qts, -100), it is effective at delayed 

 dorrucnt time in killing the overv/intoring orgEuriisms for apple 

 scab and pear scab (leaves on ground); raspberry spur blight 

 (canes and old leavv-^s); peach brown rot (mummies on ground), 

 and grape black rot (leaves and mutnmies on ground). It is in- 

 jurious to young green leaves and shoots of all of these plrnts 

 except raspberry side shoots or fruiting laterals up to 1 inch 

 in length, 



5, Best Uses; (a) On floor of apple orchards v;ith heavj,' carryover of 



scab (15-20>o or more of old leaves scabbed) in order to reduce 

 the danger of heavy primary scab infections and thus simplify 

 control with the regular suiiuacr protectiv; sprays. (See under 

 3 and 4 above for formula and time of applicatiori). Best results 

 if applied at delayed dormant, although nearly as effective when 

 applied In spring dorsiont season. Spffay -wiith truiiinj, hoao and 

 brooms so as to v.'et all surface leaves on the orchard floor; 

 using pressure 'f rot more than 350-400 lbs. Avoid disturbing the 

 matted leaves and avoid hitting the tree tops if applied at 

 delayed doj-mant. Should require 500 gals., better 600 gals, per 

 acre, 



(b) On raspberry canes and surrounding ground (4 qts. -100) 

 when longest side shoots are nn^ inch long to eradicate organisms 

 of spur blight and probably anthraonose. 



