268 Olomerellti ciii,i>ulut;i and its C()iu'(U(tI Forum 



It is doubtful if inoculation exporiinents are of mucli value in 

 establishing the relationship of the Glomerella on chillies with the other 

 species of this genus or in finding its range of hosts, as the success of 

 inoculation depends on several factors nil of whicli may not be con- 

 trollable. 



Inoculations on chillies, Carica papaya, and other plants have been 

 described. 



A new disease of Carica papaya is described. It is caused by the 

 conidial forms of a Glomerella, which is identical with that on chillies in 

 both morphological and cultural characteristics. 



The disease is found on flowers, young fruits and fruit stalks. 

 Diseased flower-buds do not open but fall off. If the infection takes place 

 when the flower whorls have opened they turn brown and wither. 



The most critical period when the fruits get infected is when they 

 are newly set. Older fruits also at times get diseased. 



Newly set and young fruits get the infection through their stigmas 

 or through the scars of the floral leaves or through punctures on the 

 skin. 



The infection is marked by the presence of a circular saucer-shaped 

 depression in the skin. 



Diseased fruits become mummified, hard and woody. 



The study of the conidial forms of the Glomerella on Carica papaya 

 also shows that Gloeosporium and Colletotrichum are one and the same 

 fungus. 



EXPLANATION OF PLATE X 



Fig.s. 1 to 8. Gloeos2)orium piperatnm on chillies and its perfect stajje Glomerella cingnlala. 

 Fig. 1. Transverse section of a chilli fruit showing the penetration of the gerra-tul)es from 



appressoria. x 421. 

 Fig. 2. Accrvulus of Gloeosporium on a chilli fruit, x 25(). 

 Fig. 3. Germination of conidia. x 4 ] 8. 

 Fig. 4. Perithecia of Glomerella pipcrata.^ x 88. 

 Figs. 5 and 6. Asci showing variation in size, x 418. Fig. .') (a) a group of asci from a 



culture, h and c asci from the host. Fig. (i, asci from inoculafed chilli .seedlings. 

 Figs. 7 and 8. Ascospores, x 418, and their germination x o.S. 

 Figs. 9 to 13. Glomerella cingulata on Carica papaya. 

 Fig. 9. Accrvulus on a Carica fruit showing uninucleate cells, x 't.~)'.\. 

 Figs. 10 and 11. Asci from culture, x 418. 

 Fig. 12. Asci from a CVmra fruit, x 418. 

 Fig. 13. Ascospores. x 418. 



Figs. 14 and 15. Glomerella cingulata the perfect stage of Colletotrirhuni nigrum on cliillies. 

 Fig. 14. Asci and ascospores. x 418. 

 Fig. 15. Germination of asco.spores. x 418. 



