40 



or 5 and a half pints weaker ammonia water (2). Stir until 

 all is dissolved, or at least all but a few granules, and then 

 dilute with water to 50 gallons. 



3. Apply the ammoniacal solution with a pump giving a 

 good pressure and furnished with a Vermorel nozzle. The 

 initial spraying should be made when the first young fruits are 

 exposed by the falling of the flowers. The second spraying 

 usually after two or three weeks, a third two or three weeks 

 later on when blooming is nearly or quite over, and a fourth 

 when the fruits are of a size ranging from that of a pea to that 

 of an olive. If necessary a fifth and even a sixth spraying 

 should be made after particularly wet weather. In most cases 

 four and often five sprayings are absolutely necessary, By 

 carefully watching for the appearance of warts on the fruit, 

 particularly during moist weather, the grower can determine 

 when to spray and whether any spraying is necessary after 

 the third application. 



4. Direct the spray so as to coat all the young fruits evenly, 

 but thinly. It is not necessay to spray the leaves but it will 

 not be possible to avoid wetting them when spraying the fruit. 



5. Watch for scale insects, and if they appear in great 

 numbers use resin wash, kerosene emulsion, or other insecti- 

 cide. This caution is necessary because in some cases where 

 trees are spread with Bordeaux mixture the fungus parasites 

 of the scale are killed, and consequently the scale insects 

 multiply very fast. As yet no such effect has been observed 

 when ammoniacal copper carbonate was used, but the possible 

 danger from this source should be borne in mind. 



6. If preferred, Bordeaux mixture can be used in place of the 

 ammoniacal solution of copper carbonate. In preparing the 

 Bordeaux mixture, take 6 lbs. of copper sulphate, and 3 lbs. of 

 lime, add 26 gallons of water to each, then mix and add 6 lbs. 

 of dissolved soap to the mixture. This spray must be applied 

 with care, giving the trees only a thin coating, otherwise the 

 youngest foliage may be injured or scale insects induced. 



SOOTY MOULD CI). 



Sooty mould of the orange, or smut (2), as it is sometimes 



(2) Aqua ammoniae (10 per cent.) of druggists. 



(1) Sooty mould of the orange is probably produced by several 

 different species of the genus Meliola. The forms known as Meliola 

 penzigi and Meliola camiliae appear to be the most common in Florida. 

 In publications in this country the fungus has usually been referred to 

 Oapnodium citri and Fumago salicina. The drsease is known in Italy 

 undej the names fummaggine, morfea, nero, &c, and in Germany as 

 Russ'uiian. 



(2) Smut is the name very generally applied to diseases produced by 

 the true smut fungi (Ustilagineae). 



