1922.] Anthracnose of tup: Cuci MnER t ndhr ^Ii.ass. 559 



directed on to every part of the structure, special attention being 

 given to all parts of the woodwork that may bo decaying. The 

 ventilators should be left open while the spraying is in progress 

 so that they may be thoroughly treated, but must be closed 

 when the operation is complete, in order to retain the strong 

 vapours. The hands of the operator sliould be protectetl by 

 rubber gloves, and goggles worn as the liquid causes the eyes 

 to smart: 



The general method of cleansing cucumber houses after a 

 diseased crop should be as follows : — 



The plants and soil surface should be submitted to a light 

 spraying with the diluted emulsion to destroy the infection pre- 

 sent on the lesions, and then removed for burning. The old 

 beds should next be moved, the houses tidied, and the borders 

 forked, ' before thoroughly spraying in every nook and cranny 

 with the diluted cresylic emulsion. A fortnight after this treat- 

 ment the houses may be replanted, but as a final precaution 

 every cavity in the woodwork should be filled with putty and 

 painted over. 



(h) Spraying during the Groicing Sea,^on. — A great luany 

 different kinds of spray solutions have been tested upon this 

 disease, and the most promising results have been obtained with 

 liver of sulphur and lime-sulphur. A wide range of copper mix- 

 tures was tested and while the sprayed sections were cleaner 

 than the controls, the fruits were badly spotted in some cases. 



One essential quality of first class fruit is the presence of a 

 perfect " bloom " on the surface, and consequently commercial 

 growers hesitate to use any spray which destroys this " bloom 

 or spots the fruit. 



Liver of sulphur and lime-sulphur have not been observed to 

 damage the fruit. The foliage of the cucumber is difficult to wet 

 thoroughly with ordinary aqueous solutions and the addition of 

 an efficient " spreader " is necessary. Soap solution and 

 saponin proved unsatisfactory in this respect, but both flour 

 paste and casein were efficient. Flour paste is cheaper :han 

 casein and is therefore to be recommended. Different propor- 

 tions of flour, liver of sulphur and water hnve been tested, and 

 it was found that a solution containing 0.5 per cent, of flour and 

 0.4 per cent, of liver of sulphur was the most satisfactory. If 

 the flour is reduced in amount, the wetting power is less satis- 

 factory, and if the liver of sulphur is increased, a scorching of 

 the young foliage results. 



