Reinking: Philippine Economic-Plant Diseases 



247 



formed in abundance among the paraphyses. The fungus grows 

 well in pure culture, producing a thick black growth of mycelium. 

 It is omnivorous, causing dry 

 sooty rots of a number of root 

 crops and fruits. Inoculations 

 with a pure culture obtained 

 from a rotted cacao pod pro- 

 duced the typical disease on 

 cacao, cassava, gabi, and sweet 

 potato. Inoculations with a 

 pure culture obtained from a 

 rotted sweet potato produced 

 the typical disease on sweet 

 potato, cacao, cassava, and 

 papaya. 



Control. — The disease gains 

 entrance through injuries on 

 mature fruits and consequently 



all injuries should be avoided. Diseased pods and other diseased 

 fruits and root crops should be burned. Spraying as discussed 

 under black rot of cacao pods will prevent infection. 



I^asiodiTdodia theobromae (Pat.) 

 Griff, et Maubl. from cacao, a, 

 young conidia (X 350) ; 6, 

 germinating young conidia (X 

 350) ; c. mature conidia (X 

 350) ; d, germinating mature 

 conidia (X350). 



Symptoms. — Lichens are common on the trunk and branches 

 where they produce grayish green blotches. Their presence 

 is not considered extremely harmful, although they do stop up 

 the lenticels and natural openings of the affected portions, 

 thereby interfering with the natural physiological functions of 

 the plant. 



Control. — A 6 per cent copper sulphate wash will remedy 

 this condition. Spraying as practiced for the control of the 

 black rot of pods will also be effective in killing the lichens. 



VIGNA SPP. COWPEAS 



blight: rhizoctonia 

 Symptoms. — Discussed under soy beans. 



CURLY top: FUSARIUM 



Symptoms. — Diseased New Era cowpeas are characterized by 

 having shriveled, curled leaves. The plants are stunted, and 

 the flowers are produced in great abundance in a bunched 

 condition. The upper parts of the plants are green and healthy, 

 but the portion of the stem just at and a little above the ground 



