XIII. A, 4 Reinking: Philippine Economic-Plant Diseases 



197 



Peatalozzia pahnarum Cke. et 

 Grev. Conidia, showing charac- 

 teristic appendages (X 990) ; 

 from pure culture. 



few millimeters in diameter. 

 Older spots are irregular-cir- 

 cular to slightly oblong, may 

 run together, and are from 1.5 

 centimeters to 2 or 3 centimeters 

 long. These spots have a light 

 brown to ashen-gray center and 

 are bordered with a narrow dark 

 brown ring (Plate VIII, fig. 3). 



Causal organism. — In the gray 

 parts are produced the charac- 

 teristic minute black acervuli, 

 which contain the spores. 

 Spores are septate, with central 

 brownish cells and hyaline end 

 cells. Two to four hyaline ap- 

 pendages are produced at one 

 end of the spores and usually 

 only one at the other end (fig. 

 11). The fungus grows well in pure culture, producing, on 

 potato agar, at first a felty mass of white mycelium, which later 

 becomes studded with the black spore bodies. The agar in old 

 cultures turns brownish. 



Control. — In severe cases of infection of young trees, spraying 

 with Bordeaux mixture is effective. Sanitation in the form of 

 burning dead and diseased leaves is the usual control. 



SOOTY mold: CAPNODIUM FOOTII BERKELEY ET DESMAZIERES 



Symptoms. — A sooty mold is often developed on the under 

 surface of the leaves. This is produced by the fungus growing 

 on honey dew of coccids ; this mold is not at all serious. 



STERILITY OF NUTS 



Symptoms. — Frequently nuts are found that are entirely com- 

 posed of husk. No meat or shell is developed within the husk 

 (Plate VIII, fig. 1). The disease is undoubtedly a nonparasitic 

 one, being due to some abnormal physiological condition of the 

 plant. 



OTHER FUNGI 



other fungi found upon the coconut include the following: 

 Chaetosphaeria eximia Sacc. and Phyllosticta cocophylla Pass, on 

 dying leaves; Anthostomella cocoina Syd., Diplodia epicocos 

 Cooke, and Coprinus fimbriatus B. et Br. on dead petioles ; Pald- 

 wania cocos Syd., Hormodendron cladosporioides (Fr.) Sacc, 



