xni, A. 5 Reinking: Philippine Economic-Plant Diseases 219 



LEAF spot: leptothyrium circumscissum sydow 



Symptoms. — A leaf spot that is not abundant, but may de- 

 stroy leaves by attacking the whole leaf surface. 



LEAF SPOT: PHYLLACHORA 



Symptoms. — Shiny black stromatic masses may be produced 

 on leaves. Little damage is done. 



Other leaf fungi are Meliola mangiferae Earle, which produces 

 a superficial growth on the leaves ; and Pestalozzia funera Desm. 

 and P. pauciseta Sacc, which are found on weakened leaves. 



Endoxyla mayigiferae Henn. has been found on dead limbs. 



MANIHOT DICHOTOMA ULE. CEARA RUBBER 



LEAF SPOT: PHYLLOSTICTA MANIHOTICOLA SYDOW 



Symptoms. — A common and sometimes severe leaf spot found 

 upon the leaves of Ceara rubber trees. Minute black specks 

 are produced in the center of the gray spots. 



MANIHOT UTILISSIMA POHL. CASSAVA, CAMOTING CAHOY 



LEAF SPOT: CERCOSPORA MANIHOTIS P. HENNINGS 



Symptoms. — Leaf spotting of the cassava is present, but not 

 abundant enough to cause any great damage. Diseased spots 

 are irregularly circular and brown. Cercospora henningsii 

 AUesch. also appears in Philippine literature as occurring on 

 cassava. 



Other fungi found on dead and dying branches are Diplodia 

 manihoti Sacc, GuigTiardia manihoti Sacc, Guignardia manihoti 

 Sacc. var. diminuta Sacc, Colletotrichum lussoniense Sacc, and 

 Steirochaete lussoniensis Sacc. Phoyna herharum Westd. is 

 found on dead leaves. 



MORUS ALBA LINN. MULBERRY 



POWDERY mildew: phyllactinia suffulta (rebent.) saccardo 



Symptoms. — A more or less common disease, producing a white 

 powder on the under surface of leaves. Little damage is done. 



RUST: KUEHNEOLA FICI (cast.) butler var. MORICOLA p. HENNINGS 



Symptoms. — This rather common fungus of many of the 

 Moraceae produces the characteristic, raised brownish sori and 

 rusty powder of spores on the under surface of leaves, as de- 

 scribed for the rust of fig (Plate XIV, fig. 3). 



TWIG FUNGI 



Dead and dying twigs yield a variety of fungi, among them 

 being the following: Traversoa dothiorelloides Sacc. et Syd., 



