Bulletin 229, Diseases of Citrus in Florida


TABLE II.-SPRAY PROGRAM FOR PRINCIPAL FLORIDA CITRUS DISEASES AND
 INSECTS, ARRANGED BY SUBJECTS.-Continued.
 APHIDS

 Time of Application Materials Used Remarks


 Winter clean-up. Dipping infested new Special effort should be
 growth of young trees made to clean up all aphids
 During late winter. in bucket containing 1 during winter and to rush
 tablespoonful of nico- the spring growth to ma-
 tine sulphate or Derris turity as quickly as pos-
 compound to 2 gallons sible.
 of water.

Time of Applicationi Materials Used Remarks


Spring application. 3% nicotine sul-I Especially important for
 phate-lime dust, or nic- I tangerine trees. Oil emul-
 On first flush of otine sulphate or Der- sion and lime sulphur
growth. iris compounds at the sprays used for other pur-
 1rate of 1 pint to 100 poses are likewise fairly
 gallons of water. (See effective for control of
 note 4.) aphids if an aphicide is
 added.

 NOTES
 1. This spray program may be expected to give reasonably satisfactory
 results under ordinary Florida weather conditions. The most effective time
 of application will vary somewhat with different seasonal conditions and
 in different sections of the State.
 2. Do not use lime-sulphur solution, bordeaux-oil emulsion, or oil
 emulsion when the temperature rises above 900 F., since burning of fruit
 may result. Lime-sulphur solutions or sulphur dusts should not be used
 within at least 10 days to 2 weeks following an application of oil emulsion;
 otherwise, burning of fruit may result.
 3. In sections of the state where trees are likely to be affected by cold
 injury the fall application of oil emulsion should be made early enough
 to give them time to recover from the effects of the spray before the ad-
 vent of cold weather. This is especially applicable to satsumas and tan-
 gerines.
 4. By employing some of the more efficient spreaders (certain oxidized
 oil derivatives, oleates or pine-oil soaps now on the market) the amount
 of nicotine sulphate or Derris compounds required for 100 gallons of spray
 mixture may be cut down to 14 pint at a saving of one-half in cost.