314 | QUEENSLAND: AGRICULTURAL JOURNAL. [1 Ocr., 1898. 
of strawberry plants with a solution cf sulphuric acid—one pint to six gallons 
of water. This mixture killed allas if burnt with fire. Soon a new growth 
started from the crowns, and now the contrast in the apparent health of the 
rows (as compared with the unsprayed ones) is quite perceptible. The sprayed 
rows are nearly healthy; those not sprayed are much diseased” [ (14), 
p. 49].* 
4. The plants should be sprayed with some fungicidal wash. This should be 
applied (by aid of a knapsack, or bucket spray pump) indiscriminately to 
blighted and to sound foliage alike: that it may prevent spores that may have 
become attached to the latter from sprouting and, so starting the occurrence 
of disease in connection with them, as well as kill those spores that are still 
associated with the spots upon the already affected leaves. In this connection 
the following fungicidal washes have each been employed with highly 
satisfactory results :— 
Potassium Sulphide (or Liver of Sulphur).—A solution of this chemical 
hasbeen recommended for use of two different strengths; J.C. Arthur advocating 
a wash containing 4-02. to 1 gallon of water [4 Imperial gallon], and Lawson 
Scribner the same amount of potassium sulphide to 4 gallons (83 Imperial 
gallons). Regarding results following its employment, the former of these 
plant pathologists writes that ‘the object sought (¢.¢., the holding in check 
the spotting of the leaves) was attained, as that part of the bed took on a 
more vigorous growth, and showed fewer spotted leaves than the remainder. 
In fact, the difference between the sprayed and unsprayed portions was so 
marked that it seemed unsafe to ascribe it wholly to the fungicide” [ (7),p- 351]. 
Sulphide of potassium wash, of the strength indicated by J. C. Arthur, is also 
amongst those fungicides suggested for employment in this connection by Dr. 
N. A. Cobb [ (21), p. 60]. 
Ammoniacal Carbonate of Copper.—This may be made as follows :—(a), 
in a vessel containing 4: gallons of hot water dissolve about 5 1b. of carbonate 
of soda (salsoda), and to this add 1 pint of strong ammonia and 8 oz. of 
carbonate of coppert [ (20), p. 886] ; or (2), “into a vessel having a capacity of 
2 quarts or more pour 1 quart of ammonia ((22 degrees Baumé), add 8 oz. of 
carbonate of copper, stir rapidly for a moment, and the carbonate of copper 
will dissolve in the ammonia ” [Progrés Agricole et Viticole, Aug. 1887, p. 114]. 
In either case there results a clear blue liquid that may be kept indefinitely, 
When required for use, the solution should be diluted with water to 50 gallons, 
some molasses being at the same time added to promote adhesiveness. 
Bordeaux Mixture.—Caretul experiments on the part of H. Garman, of 
the Kentucky Agricultural Experiment Station, made in 1890 [wéd. (18), pp. 
3-18] “have indicated quite plainly the efficacy of this mixture. ‘Treatment 
with the 22-gallon formula of Bordeaux mixture [Zé.e., 6 lb. of copper sulphate 
and 4 Ib. of lime in 17} gallons of water] begun immediately after the removal 
of the berries, and continued at intervals of two weeks, until danger from the 
parasite was passed, proved more effective than Eau Celeste, liver of sulphur, &c., 
and were in most respects entirely satisfactory” [Fairchild (28), p.45]. Again, 
investigations conducted by T. li. Brank at the Maryland Agricultural Experi- 
ment Station have shown similar good results following the employment of this 
fungicide: “It is not [writes this authority] so easily washed off as other 
mixtures, and hence acts as a preventive of the disease fora long time. Three 
Sprayings with it in the summer and fall [in Queensland this would correspond 
to our spring from September onward—H.1'.|; the first as soon as fruiting 
has ceased, and the other two at intervals of three weeks, and one spraying 
* Tt is, however, incumbent upon the writer to point out that this destruction of the foliage, 
either by fire or acid, is, unless undertaken at the time indicated, liable to injure the plants by 
depriving them of the means for elaborating material required for their subsequent growth. But, 
immediately after fruiting, the plant temporarily rests, prior to the unfolding of new foliage, and 
it is therefore during this interval that the entire leaves may be removed with little danger to it. 
+ Dr. N. A. Cobb quotes Professor Chester’s method for manufacturing carbonate of copper, 
for ma per BBs plus thelabour of making.— Agricultural Gazette, Sydney, NewSouth Wales, III., 
+1892, 
p. 
