PESTS OP THE VINERY AND STOVE. 



317 



Conidia elongated, attenuated upwards, three- to four-septate (50-70 x 

 1-Sfi), with a tinge of olive. 



This is recorded for France, Germany, Portugal, Austria, and Italy, 

 but must be quite distinct from Isariopsis clavispora, with which it has 

 been confounded. 



Sacc. Syll iv. 2200 ; Mass. PL Dis. pp. 319, 439. 



Another species {Cercospora Bossier i)^ with shorter, obtuser, and more 

 cylindrical conidia, is recorded on living vine- leaves for France, Portugal, 

 Austria, and Italy (50-60 x 7 /jl). 



A species called Cercospora scssilis (Sorok.) is recorded from Russia. 



Vine Leaf-tuft Mould. 

 Isariopsis clavispora (B. & C), PI. XIII. fig. 7. 



This appears to be entirely an American species, but authors have 

 confounded it with Cercospora viticola, and may do so again. We are not 

 aware that it has been found on any other living leaves than those of 

 Vitis Labrusca, and was first described by Berkeley. 



The spots are brown, and mostly irregular. The compacted hyphae 

 are closely united in the lower portion, but become loosened and flexuous 

 near the apex. The conidia are narrowly clavate, round at the apex, and 

 multiseptate (as many as 7-9), hyaline and attenuated downwards, but 

 brownish above (100x5-6/*), each cell sometimes including a small 

 guttule. 



Careful examination will convince anyone that the conidia are attached 

 by the thin extremity, and that they can hardly be regarded as a topsy- 

 turvy condition of Cercospora viticola. 



Sacc. Syll. iv. 2998 ; Berk. & Curt., Grevillea, iii. p. 100, No. 619 ; 

 Thiim. Pilz. Wein. 177, t. 5, f. 7 (bad). 



Other black moulds, of which many have been named in connection 

 with the Vine, appear to be saprophytes, with the exception, perhaps, of 

 Fumago vagans, which has a wide range of hosts, and may soon be dis- 

 posed of, if it ventures to appear in a well-ordered vinery. 



English Vine Disease. 

 Oidwm Tucheri (Berk.), PI. XIII. fig. 8. 



The ordinary English Vine disease was first observed in 1845 at 

 Margate by a gardener, Edward Tucker, and it is known to this day as 

 Oidium Tucheri. In 1853 it appeared in Spain, and a year later in 

 Portugal. It was first observed in Madeira in 1851, and was not long in 

 spreading through the Continent of Europe. 



The disease is too well known to need description. When the shoots 

 are struck they become spotted with dark grey or rust colour ; the leaves 

 also become spotted, and covered with a cottony substance of fine fila- 

 ments, as seen under the microscope. The grapes are covered with what 

 appears to be a white powder, like lime, a little darkened with brown. 



