A DEPARTMENT CIRCULAR 409, U. 8, DEPT. OF AGRICULTURE 
use of copper sprays, because of the control effect on their fungus 
parasites.) All plots were dusted with sulphur for the control of rust 
mites, or in the earlier years of the work were sprayed with dilute 
lime-sulphur solution for the same purpose. No appreciable fungi- 
cidal effect against melanose or fruit rots is to be attributed to these 
sulphur applications. The check plots were included in such insec- 
ticidal treatments. 
SLOPED OCANVCGE EXPLA ENTASIL FLOVSE 
F- 3-50 BORDLAP OX 071XT ORL F196 Ol 
Seana © 40 20 30 40 50 60 70 30 90° [00 
FERL (0 EEE TEREE EERE IE ES = ———y 
PEAY L 20 ee z ————— 
\) LEP = eee eee eee 2 —— EEE 
Ns A~A7ie 20 oo SD ES ET — 
SUINL £0 SSS zz LAL: ZT =a 
niet anemia 
POYVL 3 a OO —— —————— 
PILI L 1 = SS Ss Se =Wy 
MYL 46 = —— —————— ee 
0) SVEHVL CS EEE ee phe? eee 
\ ep 6 Te. Tee eG eas RE a a a 
LM 15 ; ———————————————— 
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\ IPEXRYAL 17 : age Me cane SS SSS YI. 
QN\7AF- —— 6 a ———— 
SNE 16 ———————— ITD Vl: UM LEE LL 
KGW —S==—=S=S==S=S==S=S=SSEK=X“an«"|”yuyaW' /"7/|""MWWtt€a lal tb 
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GLO CIDE ILFERL OF FEY FEFKEEE 
Fic, 1.—Percentage proportions of first, second, and third grade oranges, with respect to 
melanose infection, from experimental plots sprayed once with 3—3—50 Bordeaux mix- 
ture plus J per cent oil on the dates and for the years indicated. Mature fruit from 
these and similar plots were used for holding tests to determine the effect of spraying 
at various times on the keeping quality of the fruit during marketing 
Samples of fruit were taken first when just mature enough for 
marketing and two or three times later at intervals of about three 
weeks, thus covering the normal marketing period for the fruit in 
question. Random samples of 50 fruits were taken in duplicate on 
each sampling date, giving a total of 300 fruits in the six lots for 
the full sampling of each spray treatment each season. In some 
seasons circumstances prevented the collection of this full sampling.: 
The fruit was handled carefully to avoid injury that might lead 
to blue-mold infection. 
