306 



BULBS AND TrBEBOUS-BOOTED PLANTS. 



cousin of the Lily Disease, if not the same thing. It has 

 the hard, dark masses, or sclerotia, and the other struc- 

 tures mentioned with the Botrytis (see engraving), and 

 is probably Sderottnia (Peziza) tuTborum, Wak. 



The gunimosis. so called, of the Hyacinth, also com- 

 mon to the Tulip and Ixia bulbs, has likewise been 

 studied by "Walker. The pure white gum pockets are 

 found mostly between the epidermis and tissue below, 



the starch being replaced 

 with gum by a process of 

 degeneration. These gum- 

 bearing cells may increase 

 abnormally in size. Walker 

 concludes that this gum- 

 mosis and the •'white rot" 

 of Hyacinths are the same 

 thins:, and. having failed to 

 botktiis sclerotiot. ^roAnce the abnormal con- 

 dition artificially by inoculation, affirms that there is no 

 indication of the cause being due to a parasite of any 

 kiud. This last trouble seems, therefore, a purely physi- 

 ological one, aud there are many such among plants liv- 

 ing under the pressure of high culture. 



The necessity for uninfected soil and healthy bulbs 

 is thus shown by Dr. Halsted. In such cases it is also 

 useful, according to Dr. William C. Sturgis, of the 

 Connecticut Experiment Station, to thoroughly wash all 

 implements used in infested ground, to burn all diseased 

 plants, and, if possible, to bum over the ground on 

 which they grew. As soon as noticed all diseased plants 

 should be removed and burned immediately. For dis- 

 eases of the leaves and other portions above ground, 

 some of the usual fungicides may be found useful. Dr. 

 Charles H. Peck, State Botanist of Xew York, describes 

 their preparation as follows : The Bordeaux mixture, 

 diluted to half the original strength, is made by dissolv- 

 ing six pounds of powdered copper sulphate in ten gal- 



