FUNGOID PESTS OF CULTIVATED PLANTS. 245 



This pest is known in France, Germany, Austria-Hungary, and South 

 Africa. 



Spraying is recommended early in the season with Bordeaux mix- 

 ture, or potassium sulphide, to arrest the spread of the disease. 



Sacc. SyllMi. 1928 ; Mass. PL Dis. p. 228, fig. 57 ; Cooke, M. F. p. 213 ; 

 Cooke, Hdbk. No. 1587 ; Ploivr. Brit. Ured. p. 127 ; Grevillea, vii. 136. 



Beetroot Tumour. 

 CEdomyces leproides (Trab), PI. XXIV. fig. 35. 



Beetroots were observed in 1901 affected by tumour such as had not 

 been observed before, and which appeared to be similar to, if not identical 

 with, a tumour which had been found on Beetroot in Algeria. 



The tumour consisted in a large nodulose outgrowth from the side of 

 the root, about the size of a hen's egg, attached by a narrow isthmus to 

 the root. When cut it was observed that the flesh was precisely similar, 

 the coloured rings being continued through the isthmus and concentrically 

 around the tumour. Externally there was also no difference in colour or 

 appearance, save here and there a darker stain ; internally, where these 

 stains occurred the flesh was blackened for some little distance inwards, 

 but no hyphse or spores could be found. 



In the original Algerian specimens it is stated that " in the substance 

 numerous cavities were found filled with dark-coloured spores, which were 

 subglobose, produced at the apex of a hypha, which bore a large vesicular 

 swelling just below the spore." None of the cavities, spores, or hyphae 

 were observed in the British specimens. Probably this may be accounted 

 for by the climatic differences of the two countries. 



Although we regard the tumour on Potatos as the same species, some 

 authors are of a different opinion. 



Mass. PL Dis. p. 225, fig. 55. 



The young leaves of Beet and Mangold are liable to attack, on the 

 Continent, by the rot mould Peronospora Schachtii (Fckl.). 

 Mass. PL Dis. p. 79. . 



Beetroot and Mangold Rot. 



Phoma tabifica (P. & D.). 

 Sphcerella tabifica (P. & D.), PL XXIV. fig. 36. 



For the past two years this disease has attacked the Beet crop in 

 Germany and France, and has at length made its appearance in Britain. 

 At first, about August, the largest leaves droop, and exhibit discoloured 

 patches bordered by an orange-brown zone, and finally the tissue becomes 

 dead. The disease then passes to the root, penetrating to the heart, killing 

 the young heartdeaves. Minute perithecia appear on the dead parts of the 

 leaf-stalk, containing numerous minute conidia. This is the Phoma stage. 



Later in the season the Spthcerella condition appears on the dead 

 petioles, often accompanied by black moulds. 



The relation between the mould and Sphcerella (if any) has not been 

 determined. 



