178 



The Philippine Journal of Science 



be found Peroneutypella arecae Syd., Eutypella rehmiana (Henn. 

 et Nym.) v. Hohnel, Elfvingia tornxita (Pers.) Murr., and Phel- 

 lostroma hypoxyloides Syd. 



ARTOCARPUS COMMUNIS FORST. (ARTOCARPUS INCISA LINN. F.) . 

 BREADFRUIT 



FRUIT ROT: RHIZOPUS ARTOCARPI RACIBORSKI 



Symptoms. — The same fruit rot occurs on Artocarpus com^ 

 munis Forst. as is discussed under Artocarpus integra (Raderm.) 

 Merr. 



LEAF spot: CEaiCOSPORA ARTOCARPI SYDOW 



Symptoms. — The common breadfruit tree is attacked by this 

 typical Cercospora spot-producing fungus. Spots are more or 

 less irregular with gray centers. Little damage is done, 



Marchalia constellata (B. et Br.) Sacc. also causes a leaf spot. 

 Diplodia artocarpi Sacc. may be found on languishing leaves. 

 Cycloderma depressum Pat. may be found on the trunk. 



ARTOCARPUS INTEGRA (RADERM.) MERR. (ARTOCARPUS INTEGRIFOLIA 

 LINN. F.). JACK FRUIT, NANGCA 



FRUIT ROT: RHIZOPUS ARTOCARPI RACIBORSKI 



Symptoms. — The male inflorescence and young fruit may be 

 attacked by this fungus. The blossoms are killed. Young in- 

 florescences, 5 to 10 centimeters long, are subject to attack. 



On these the organism usually 

 starts at the stem end or in 

 wounds, causing a soft rot. The 

 entire rotted portion is even- 

 tually covered with a dense black 

 growth of the fungus, with the 

 characteristic mold sporangia 

 protruding. The fungus grad- 

 ually advances, until the entire 

 inflorescence becomes rotted and 

 drops (Plate XIX, fig. 6) . Ex- 

 tensive damage may be produced. 

 Causal organism. — T y p i c a 1 

 Rhizopus sporangia and sporan- 

 giophores are produced. The 

 outer walls of the sporangia are 

 KWzojms artocarpi Rac a, spo- very delicate, breaking upon con- 



rangium with spores (X 330) ; "^ ' o t- 



b. rhizoid (X 330), from tissue tact wlth Water and spreading 



of fruit: c, bursted sporangiun, (-J^g spOreS (fig. 6). The fungUS 



showing columella, sporangio- 



phore, and spores (X 330). grOWS Well m pUrS CUlturB, 



FiO^ 6. 



