32 DISEASES OF CROP-PLANTS 



sunken patches in the cotyledons, and may be trifling or severe. 

 In the tomato the pulp of immature fruit is blackened in spots 

 and the taste of ripe fruit spoilt ; in the case of the orange atten- 

 tion was drawn to the infection by the peculiarity of the flavour. 



Species. 



LEGUMINOS^. A. B. C. D. 



Vigna catjang, V. unguiculata (Cow pea, Rounce- 



val, Black-eye). -f 4- 



Dolichos Lablab (Bonavist). + 



Phaseolus lunatus, P. vulgaris (Lima, French bean) + 



Canavalia gladiata (Sword bean), -j- 



Crotalaria juncea (Sunn hemp). + 



Crotalaria retusa. + 



Tephrosia spp. -{■ 



Indigo/era spp. -f 



Cassia spp. (herbaceous). -|- 



MALVACE^. 



Gossy^ww spp. (Annual and perennial cotton) + + + + 



EUPHORBIACE^. 



Ricinus communis (Castor oil). + 



Jatropha urens. -j- 



SOLANACE^. 



Ly coper sicum esculentum (Tomato). + + + 



Datura metel + 



CUCURBITACE^. 



Momordica Charantia (Coolie pepper). + 



ASCLEPIADACE.,©. 



Asclepias curassavica. -\- 



RUTACE^. 



Citrus sinensis (Sweet orange). + 



The Sooty Moulds (Capnodios) causing Black Blight. 



The Perisporiacec-E, which include the sooty moulds, are 

 Ascomycetes with superficial mycelium, occurring mostly on 

 leaves or fruits. The family is nearly related to the Erysiphaceas, 

 which it resembles in habit, but its members are at once dis- 

 tinguishable by their dark brown or black colour. They occur 

 as webs or closely investing films on a great variety of plants, 

 and the sooty moulds give rise to the condition usually called 

 " black blight " in these islands. 



The further classification of these fungi is in a very confused 

 condition, and their nomenclature remains a matter of doubt 



