102 FUNGOID PESTS OF CULTIVATED PLANTS. 



either cylindrical, or slightly attenuated upwards, and divided by seven 

 or more transverse septa (80-120 x 7 /x) and a little curved, but scarcely 

 at all coloured. 



Spraying with dilute Bordeaux Mixture will probably assist, but 

 infected leaves should be picked off and burnt. 



Gard. Chron. Sept. 5, 1896, p. 271 ; Journ. E.H.S. xxviii. p. 142. 



A Musk Melon disease is attributed to a black mould (Alternaria) in 

 N. America ; see Journ. B.H.S. 1901, xxvi. p. 563. 



Gard. Chron. July 27, 1905, p. 96, recommends vapourising with 

 sulphur. 



We know nothing whatever of the smut on Cucumber roots described 

 under the name of Ustilago Cucumis in Proc. Roy. Soc. Ed. xv. 1887, 

 p. 403. 



CUCUMBER SCAB. 

 Cladosporiwn Scabies (Cooke). 



The disease forms dark depressed spots on the surface of the fruits, 

 in the first instance, which gradually enlarge and expand until they 

 become quite black and convex-like nodules, and crack either around or 

 across, exposing the pale under stratum. At first they are about a 

 quarter or half an inch across, and finally extend to an inch or two inches, 

 or become confluent. The surface is from the first mealy with the 

 conidia, which are afterwards profuse, mixed with slender hyphae, so as 

 to impart a grey velvety appearance. The earliest conidia are more 

 nearly globose than afterwards, from 10x8tol2x8yu becoming at 

 length as much as 25 x 8 /^/, and then usually uniseptate, but with 

 scarcely any colour. Occasionally two or three conidia are concatenate. 

 The hyphae are long and slender, half or two-thirds the diameter of the 

 conidia, septate, simple, not constricted or nodulose, of a pale smoky 

 colour, and very sparse in comparison to the conidia. The flesh of the 

 fruit beneath the spots turns to a golden or tawny-brown. The black 

 elevated spots resemble large scales, and hence the parasite has been 

 called Cladosporium Scabies (Cooke). It is allied to the Cladosporium 

 which attacks the leaves of the Tomato. All diseased fruits should be 

 removed at once and destroyed. The remainder should be sprayed to 

 preserve them from attack. Condy's fluid (dilute) should be tried, as 

 less likely to injure the fruits than copper solutions. 



Journ. E.H.S. xxviii. 1904, pp. clxix., clxxi. 



CUCUMBER SCLEROTE. 

 Sclerotinia Libertiana, see PI. VII. fig. 119. 



Recently the stems of Cucumber plants have been submitted to us 

 which called to mind very strongly a similar disease of Potato haulms. 

 The stems contained a quantity of hard black sclerotia enclosed in a 

 fluffy white mycelium, which caused the vines to bleed and rot. These 

 hard substances were at first whitish, then turned brownish, and ulti- 



