EFEKTIVITAS Plant Growth Promoting Rhizobacteria (PGPR) DAN Pseudomonas fluorescens DALAM MENGHAMBAT PENYAKIT BUSUK LUNAK PADA TANAMAN KUBIS BUNGA (Brassica oleraceavar. botrytis L)

Abstract

ABSTRACT
The aims of this research were to find the effectiveness of PGPR and P. fluorescens in
preventing wet rot that caused by E. carotovora. This research was conducted in Village
Paslaten, Tomohon city. The research was conducted in three places, namely The Laboratory
of Plant food and Horticulture of Protection North Sulawesi Province, cauliflower planting
location in Tomohon and the laboratory of Microbiology and Plant Pathology Faculty of
Agriculture Unsrat Manado. This research used RCBD with 4 treatments and 6 repetitions.
Observation was done in 6 times and the time interval was one week. The result of the study
showed several symptoms that happened to the cauliflowers, they were: the leaves were
blackish brown, shrank and looked pale, and also the small wet symptom sections become
widen quickly. The infected soft produced a bad oder. This research showed the impact of
collaborated treatment of PGPR and P. fluorescens was more effective since it showed an
signification different from giving PGPR or P. fluorescens separately that did not show any
impact. The result of isolation showed that the bacteria which caused the wet rot in plant
cauliflower in Tomohon was bacteria Erwinia Carotovora looking form its characteristic,
creamy white colonies, slimy, shiny, convex and looked flat.
Keyword: Effectiveness, Cauliflower, Soft root, Erwinia carotovora, Plant Growth
Promoting Rhizobacteria, Pseudomonas fluorescens.