citrus scab: its cause axd control. 
33 
Table 11. — Spray schedules/or the control of citrus scab in Florida. 
Xo. /.—For Orchards Where Citrus Scab Is Always Serioxs.i 
Application. 
Time of application. 
Materials used. 
Object and remarks. 
First 
Second 
Third 
Just before growth 
sets in. 
In height of bloom 
Two weeks later 
Two weeks after third 
application. 
Bordeaux mixture, 3-3- 
50, plus 1 per cent oil 
as emulsion. 2 
Bordeaux mixture, 3-3- 
50, plus 0.5 per cent 
oil as emulsion. 2 
do 
To cover old scab lesions. Direct the 
spray especially toward the under 
surface of the leaves; reduces very 
early citrus-scab infection. 
For the protection of expanding 
leaves and small fruit against scab 
and melanose. 
For the protection of small fruit 
against scab and melanose. 
Advisable if the season is rainy. For 
protection against scab; will also 
reduce early melanose infection. 
Fourth 
Bordeaux mixture. 3-3- 
50, plus 1 per cent oil 
as emulsion. 
Caution: Insecticidal applications must follow to prevent serious scale injury. 
No. 2.— For Orchards Where Citrus Scab Varies from Moderate to Serious. 3 
First . . 
Second. 
Third. 
Fourth. 
Just before growth Bordeaux mixture, 3-3- 
sets in. 50, plus 1 per cent oil 
as emulsion. 
In height of bloom Lime-sulphur solution, 
1 to 40, or Bordeaux 
mixture, 3-3-50, plus 
0.5 per cent oil as 
emulsion. 
Two weeks later do 
Two weeks after third 
application. 
Bordeaux mixture, 3-3- ' 
50, plus 1 per cent oil ! 
as emulsion. 
To cover old scab lesions. Direct the 
spray especially toward the under 
surface of the leaves; reduces very 
early citrus-scab infection. 
To protect expanding leaves and 
small fruit from scab and melanose. 4 
If the season is normal use lime- 
sulphur; if the season is rainy use 
Bordeaux mixture. 
To protect small fruit from scab and 
melanose. If the season is normal 
use lime-sulphur; if the season is 
rainy use Bordeaux mixture. 
If the season is rainy, probably ad- 
visable for protection of smallest 
fruits against scab; will also reduce 
early melanose infection. 
No. 8.— Fob Orchards Where Citrus Scab Is of Minor Importance. '* 
First i Just before growth I Lime-sulphur solution, 
sets in. 1 to 30. 
Second In height of bloom . 
Third Two weeks later. . . 
Lime-sulphur solution, 
1 to 40. 
....do 
To cover the old scab lesions. Direct 
the spray especially toward the 
under surface of the leaves; pre- 
vents early scab infections. 
To prevent infections on expanding 
leaves and small fruit. 
To prevent infections on expanding 
leaves and small fruit. Advisable 
only when the season is especially 
favorable for scab development. 
1 To insure bright clean fruit at harvest time follow schedule No. 1 with the regular scale, white-fly, and 
rust-mite spray applications (see Farmers' Bulletin 933), one or two additional applications of which should 
be used to check the heavy increase of insect pests following copper sprays. 
2 Prepare 3-3-50 Bordeaux mixture in the usual way. Three quarts of oil emulsion, Government formula, 
in 50 gallons of Bordeaux mixture gives 1 per cent oil. Add the oil emulsion to the Bordeaux mixture while 
the latter is being thoroughly agitated in the spray tank. Keep up the agitation while spraying. 
Preparation of boiled-oil emulsion, Government formula. 
[See U. S. Dept. Agr., Farmers' Bulletin 933.] 
Paraffin oil gallons 2 
Water ga U 0I1 . . i 
Fishoil soap pounds. . 2 
Put oil, water, and soap into a kettle or other vessel that will stand fire and heat to the boiling point. 
While still very hot, but after removal from the fire, pump the material into another vessel with a bucket 
pump and then pump back again. 
3 To insure clean, bright fruit at harvest time follow schedule No. 2 with regular scale, white-fly, and 
rust-mite spray applications. When Bordeaux mixture is used additional applications of oil emulsion 
most likely will be necessary. 
4 Lime-sulphur solution has not proved effectivein melanose control. 
5 To insure clean, brght fruit at harvest time follow schedule No. 3 with the regular scale, white-fly and 
rust-mite spray applications. 
'4573°— 23— Bull. 1118 3 
