204 The Philippine Journal of Science ms 



Phyllosticta graffianu Sacc. and Mycosphaerella dioscoreicola 

 Syd. are found on leaves of Dioscorea esculentd (Lour.) Burkill. 



DOLICHOS LABLAB LINN. LABLAB BEAN 



LEAF SPOT: CERCOSPORA 



Symptoms. — Round gray-centered spots with purplish borders 

 may be scattered over the surface of leaves. Little damage is 

 done. 



Causal organism. — Typical, elongate, septate, tapering Cerco- 

 spora spores are produced on light brown conidiophores. The 

 latter are formed in groups from the stomata. 



Control. — Crop rotation will reduce the prevalence of the 

 disease. 



ORANGE GALLS: WORONINELLA DOLICHI (CKE.) SYDOW 



Symptoms. — This disease is similar to that discussed under 

 Psophocarpus tetragonolobu^ DC. 



Septoria lablabis Henn. and Septoria lablabin^i Sacc. may be 

 produced on weakened mature leaves. Diplodia lablab Sacc. is 

 produced on the stems. 



On dead Kultha beans, Dolichos uniflorus Lam., may be found 

 the following: Vermicularia horridula Sacc. and Didymella 

 Vussoniensis Sacc. 



FICUS CARICA LINN. FIG 

 rust: kuehneola fici (cast.) butl. (uredo fici cast.) ^ 



Symptoms. — A disease that may be very severe, causing defo- 

 liation, especially during the rainy season. Raised brownish 

 sori are produced on the under surface of the leaf. Often the 

 under surface is covered with a rusty powder composed of spores. 

 Small yellowish spots are produced on the upper surface of the 

 leaf above each sorus on the under surface. 



Caudal organism. — Usually cushion-shaped, light brown, spiny 

 uredospores only are produced. Teleutospores are smooth, in 

 chains, and with the germ pores apical. 



Figs are not grown commercially in the Philippine Islands. 

 Wild figs, of which there are many species in the Islands, have 

 the leaves commonly spotted with the characteristic stromata 

 produced by the genus Phyllachora. 



GLYCINE MAX (LINN.) MERR. (GLYCINE HISPIDA MAXIM.). SOY 



BEAN, SOJA 

 black mildew: trotteria venturioides saccardo 

 Symptoms. — Frequently entire patches of soy beans appear 

 yellowish and sickly. This may be due to a fungus that makes 



