In goneral, the uso of the sulfur dusts has been accompanicd 
by fewor now wilt infcctions than has the uso of sprays. Flotation 
sulfur dust has been somewhat more effective than Kolodust, perhaps 
because it is composed of finer particles and gives a more even coverage 
of the leaves, The data in table 1 indicate that Bordeaux is somewhat 
more effective in reducing the number of cases of wilt infection than are 
cithor of the two sulfur sprays used. Neither sulfur spray proved 
materially effective in preventing the occurrence of new cases of wilt 
infoctione 
2.--Control of leaf disensese Leaf diseases, particularly those 
that result in spotting, occur in varying amounts from one year to another, 
their abundance and severity depending largely on the prevalence of weather 
favorable or unfavorable to thom. When present in severe amounts, they bring 
about heavy defoliation at a time when the leaves should be building up a 
reserve supply of food materials and thus undoubtedly seriously influence 
Diagram I. Tho effectiveness of cortain fungicides in reducing the 
amount of leaf-spotting on olms by parasitic fungi in 1932, a season when 
this type of injury was exceptionally prevalent. 
i. F Seaiieieeaeemeeinteetiememmeen 
sd Seon No Pungieide 
al 4,59 Flotation Sulfur Dust | 
oe 
nemerewrre ese om! 
1114) | 32,81 No Fungicide 
Ilse 6.65 Bordeaux Mixture 
iho! Miles teeth OEE RE RA LSA A ae OR EP 5 Oe 
tv. i wn A BY EL ae ee PR vo «1 Rk toe Ae lta tes ME A et Bil ry eA NE Mi AEE CAE EO 
ReeSese soe eee] 21489 Koloform 
eeeewers a Oper tweets © |} 80,52 No Fungicide 
va 12.59 Bordeaux Mixture 
A CRE | Ne re eee 
[Jae inte Sig tS. He Fungicide 
ea sc1'7.25 Bordeaux Mixture 
7.07 Dry Wettable Sulfur 
~~] 8.73 No Fungicide 
Oe ee a ee 
iste. 8 SG.ph ian Fungicide 
| } 6.22 Koloform 
Oe ee ee ee ee ee Se eA Lt AA OE AEN Sl A RIO I A RR 1 = RY a Rs RN eB 
IX-. 
1 106.53 No Fungicide 
ES A eT LTR NM INET Samm RTS NAIR OA I 
itad Wiest M. oe ELL. EEE rn Neen caeoter Ammen ye tee OL TENE eo caret ae 
“ ARES, AE 
O 10 20 30 8640 60 80 LOO 120 140 
Average Number of Spots per Leaf 
~4ha 
