100 FUNGOID PESTS OF CULTIVATED PLANTS. 



Gourd Anthracnose. 

 Glaosporium orbiculare (B.), PI. VIII. fig. 126, conidia. 



This disease appears in orbicular spots on ripe gourds, melons, Sec. 

 The pustules are often run together and confluent, with a common pore 

 or orifice. The conidia are small and oblong, tinged with pink (about 

 14 x Sh /*), and are expelled in thin tendrils. The genus to which this 

 spacies belongs is almost universally destructive, and affects various plants. 

 The disease which is caused by them is known throughout the United 

 States by the name of Anthracnose. 



As to the specific differences between the two species recorded as 

 Glceosporium orbiculare and Glc&osporiiim heticolor it is not of much 

 practical importance, and some at least of American mycologists believe 

 them to belong to the same species. 



Recorded in Portugal as well as in Britain. 



Every effort should be made to prevent the dispersion of the conidia of 

 all species of Glaosporium, by spraying, and destruction of the affected 

 parts. 



Sacc. Syll iii. 8759 ; Cooke, Hdhk. No. 1407 ; Berk. Ann. N. H. 

 No. 106, t. vii. f. 6. 



Cucumber Anthracnose. 

 Gl<xosporium lagenarium (Pers.), PI. VIII. fig. 127. 



To this fungus is attributed the fungus disease which attacked 

 Cucumber plants in 1892 and 1893, but was previously known upon Gourds 

 on the Continent. In this instance the leaves, some portions of the vines, 

 and especially the ends of the young fruits, rotted and became pulpy. No 

 distinct pustules could be detected, but the rotting parts contained 

 fungus mycelium, and a great number of the sporules of the Glceosporium. 



The pustules are disposed to occur in rings, and are rather small upon 

 the fruits, and somewhat roseate ; the conidia are ovate-oblong, often 

 unequal-sided (16-18 x 5-6 yu.), colourless, and without division, growing 

 on pedicels nearly as long as the conidia, oozing out when mature. 

 The habit is certainly different from that of Gla'osporium orbiculare, and 

 attacks also the stems and foliage. 



Among the tissue of the surface of the fruits were found the fusi- 

 form curved conidia of another pest, Fusarium reticulation, which are 

 triseptate (40 /j. long), and are constantly found in company with this 

 Glc&osporiwn upon gourds. 



It is reported in France and Italy as a noxious pest. 



Sacc. Syll. iii. 3757. 



Another species, if really distinct, has been found on Gourds in 

 Australia. 



Cucumber White Mould. 



Oidiwm erysiphoides (Link), PI. 1\. fig. 12n. 



This troublesome white mould is very apt to make its appearance on 

 Cucumber or Melon plants in frames, or on Gourds in the open. It 

 spreads in white blotches over the foliage and often covers the plant. 



