TY  - BOOK
AU  - Jubina P A 
AU  - Girija V K (Guide)
TI  - Biological control of foot rot of black pepper with antagonstic bacteria from rhizosphere
U1  - 632.3 
PY  - 1997///
CY  - Vellayani
PB  - Department of Plant Pathology, College of Agriculture 
N2  - An attempt was made at the Department of Plant 
Pathology, College of Agriculture, Vellayani to screen and 
identify antagonistic soil bacteria with potentiality to suppress 
Phytophthora capsici, the incitant of foot rot or quick wilt of 
black pepper. Bacteria were isolated from the rhizosphere of 
wild pepper plants, pepper plants in disease free plantations, 
healthy plants in diseased pepper plantations, pepper plantations 
where organic farming is practiced, undisturbed forest soils and 
vermicompost. Population of bacteria in the various 50ils and 
vermicompost showed great variability ranging from 13.67xl04 to 
168xl04 cfu g-1. High population of bacteria was recorded from 
the rhizosphere soils of healthy plants in diseased pepper 
plantation of Pepper Research Station, Panniyur and wild pepper 
plants in virgin forest of Punnamala region of Silent Valley. 
Of the 194 isolates, only 15 isolates showed antagonism 
to P. capsici in vitro. Three isolates B5, B7 and Bl3 were 
highly effective in in vitro inhibition of sporangial production 
by the pathogen and disease suppression in rooted cuttings of the 
susceptible pepper variety, Karimunda. Isolate B13 was found to 
be the most ideal candidate with the ability to reduce mortality 
of pepper plants and foliar blighting and to provide continued 
 
protection for a longer period. The isolate was effective as 
 

 
cell free filtrates also and was found to produce 
 

small 
 

 
quantities of the enzyme, cellulase. Isolate B5 also reduced the 
disease in pepper plants. The live cells and cell free filtrate 
of this isolate afforded good foliar protection against 
P. capsici. The isolate B7 was found to have a dual role 
disease suppression and growth promotion. All these isolate~ had 
good survival in the rhizosphere of pepper plants with population 
of 104 to 105 cfu g-l soil. The effective isolates were gram 
 

 
positive, aerobic, 
 

sporulating, rods with ability to produce 
 

 
catalase and were found to conform to genus Bacillus. 
 





UR  - https://krishikosh.egranth.ac.in/handle/1/5810099246
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