SYNCHYTRIUM 



103 



is known to be infected, by having produced a diseased crop, 

 do not attempt to grow a crop of potatoes again for at least 

 six years, unless very stringent measures are taken to destroy 

 the organisms present in the soil. The land must be fallowed 

 and dressed with gas-lime, at the rate of from four to five tons 

 per acre. Slightly diseased potatoes should not be given to 

 animals raw, but should be always boiled first. 



Journ. Bd. Agric., Leaflet No. 105. 

 Massee, y<?#r. Bd. Agric., 9, p. 307 (1902). 

 Percival, Journ. Bd. Agric., 9, p. 320 (1902). 

 Schilberszky, Ber. d. deutsch. Bot. GeselL, 14 (1896). 



FIG. 22. Rhizoptis nigricans. i. portion of fungus; 2, zygo- 

 spore ; 3, spores; 4, Synchytrium taraxici ; resting-spore in 

 epidermal cell ; 5, resting-spore liberating a mass of sporangia ; 

 6, a sporangium liberating zoospores. All highly mag. 



Synchytrium Niessii (Bubak) forms warts on the leaves of 

 Gagea and Ornithogalum umbellatum. The warts are at first 

 dirty white, bounded by a dark brown line. Resting-spores 

 globose, single or 2-10, sometimes up to 20 in inflated or 

 spindle-shaped epidermal cells. 



Bubak, F., Sep. Osterr. Bot. Zeitschr., No. 7, Ser. 2 (1898). 



