600 Agricultural Gazette of N.S.W. [Aug. 2, 1920, 



Vines. 



As a precaution against black spot, oidium, and otlier diseases, sulpliuric- 

 acid solution, or combined sulphuric acid and sulphate of iron, may be applied 

 to the vines as a swab before the buds have burst. Only the fruiting wood 

 need be dressed. It is claimed that under some conditions it is an advantage 

 to remove the old bark ; on the other hand, it has been found an advantage 

 in dry, hot districts to allow the bark to remain as a protection to the stock 

 from excessive heat. After the middle of this month it will become too late 

 to plant deciduous trees. 



Brown Spot of Mandarin. 



Where it is intented to treat Emperor mandarin trees for brown spot, the 

 diseased and dead wood should be cut out as far as possible and burnt. The 

 trees should then be sprayed with Bordeaux mixture (summer strength) as 

 the trees put on their fresh growth in the spring, just prior to blossoming ; a 

 second application of Bordeaux mixture should be made as soon as the fruit 

 has set. The necessity for later applications of Bordeaux mixture and their 

 frequency, depend on weather conditions. Two growers who have tried this 

 treatment have expressed themselves satisfied with the control over the 

 disease, and one is making a further planting of Emperor mandarins. 



Since the experiments with this disease were concluded at Erina, the 

 Department last year commenced another experiment at Somersby. In this- 

 case, the trees were younger and the disease was showing further down in 

 the older wood than was the case in the Erina experiment. It was decided 

 to head the trees well back, cutting well below where the disease was 

 showing on the wood, in the expectation of a new growth clean of disease. 

 This was not the result, however, for the new growth developed the disease 

 badly. The expei'iment is to be continued in the spring, to ascertain 

 whether the disease can be checked by treatment, but so far as the experiment 

 has go?ie it appears that if trees are attacked when young, or worked with 

 infected buds, it is a much more difficult proposition to deal with it than 

 when the ti'ees are comparatively old when first infected. 



An Experiment with Table Grapes on Sultana Stock. 



That Cornichon and Ohanez vines do better on their own stock thati when- 

 grafted on to sultanas was recently proved at Yanco Experiment Farm^ 

 where, as the sultanas were not required, it was decided to work the table 

 grapes on to them. 



The experiment proved exclusively that the procedure was not an economical 

 one From the appended compa)-ati\'e yields it will be seen that it would 

 have paid better to have uprooted the sultanas and planted the table grapes 

 on their own stock. The vines were planted 10 feet by 10 feet apart. 



On their own stock, 360 Cornichon vines yielded 487 half-cases. 



On sultana stock, 423 Cornichon vines yielded 25)3 half-cases. 



On their own stock, 360 Ohanez vines yielded 403 half-cases. 



On sultana stock, 423 Ohanez vines yielded 301 half-cases. — W. J. Allen^ 



