NOTES AND ABSTRACTS. 



451 



leaves of the Chri'stmas rose. The fungus {Conioihiirimn hellebori) is 

 ah^eady known on wild hellebores, but has lately been causing serious 

 damage to cultivated varieties. To preserve the garden plant from its 

 ravages, it must be treated with Bordeaux mixture before the appear- 

 ance of the yellow stains caused by the disease upon the leaves. Once 

 the mycelium is propagated in the tissues of the plants nothing more 

 can be dorie. — M. L. H. 



^ Chrysanthemum Gpowers, International Cong-ress of {Jour. 

 Soc. Nat. Hort. Fr. series iv. vol. xi. Nov. 1910, p. 710).— The dis- 

 cussions at this Congress were concerned chiefly with the best times 

 for striking and pinching chrysanthemums and with methods of pre- 

 venting rot in the flowers. The habits and ways of individual varieties 

 are said to differ, and to achieve the best results it is necessary to study 

 each variety and to perform all cultural operations at the period which 

 best suits its individual peculiarities. 



It is impossible to cure rot in the flowers once it has appeared. It 

 only remains to remove each affected bloom carefully and burn it. 



To prevent the disease avoid excess of nitrogenous manure at any 

 time, and give none once the flowers begin to expand. 



Eemove the plants under cover at this period and only water when 

 necessary, avoiding overhead moistening. Give plenty of air, more 

 being required with a high than with a low temperature. Dry air is a 

 great preventive of grey-rot. From the month of September the 

 following fungicides will be of use, those in powder being the most 

 efficacious: — 



Powdered steatite . . . . . 92 per cent. 



Aluminium sulphate . . . . . 3 „ 



Sulphate of lime ...... 4 ,, „ 



Iron sulphate ...... 1 „ 



used freely every fifteen days. 



The steatite is of no advantage chemically but is an invaluable 

 vehicle. 



This is Barello's formula. 



The following three mixtures of Lacharewicz may be used, the 

 first two in dry weather, the last in wet. They should be prepared at 

 the time of use : — • 



1 . Plaster of Paris . . . . . 60 per cent. 

 Sulphosteatite containing 20 per cent, of 



copper sulphate 



40 

 60 

 32 



8 

 55 



5 



2. Plaster of Paris 



Talc 



Sulphosteatite of copper . 



. 3. Plaster of Paris 



Soap powder . . . . 

 Sulphosteatite containing 20 per cent, sul- 



phate of copper 



40 



G G 2 



