ESTATE CROPS NEWS – Root lesion nematode (Pratylenchus brachyurus) is an important pathogent of patchouli in Indonesia and causes sifnificant losses at several main patchouli central productions such as Aceh, North Sumatra, West Sumatra, Bengkulu, West Java and Central Java. Some control measures, i.e. nematicides, cultural practices, and organic matter amendment, have not given satisfactory result in managing nematode population in the field.
Biocontrol approach by using endophytic bacteria is promising component to control nematode, since such bacteria, also promote plant growth, through production of phitohormones and enhance nutrient availability. Endophytic bacteria can be isolated enhance from all parts of the plant, especially the roots.
Population density of endophytic bacterial is strongly influenced by varieties and cultivation techniques, populations of endophytic bacteria are more common in patchouli plants organically grown compared to non-organic farming. Endophytic bacterial colonized the epidermis, cortexs, inter-and intracellular root tissues.
The mechanism of endophytic bacteria in suppressing nematode P brachyurus was induced resistance, with and increase in salicylic acid, pereoxidase and phenol compounds and colonize root epidermal cells. Endphytic bacterial as biocontrol nematodes may suppress penetration, reproduction, and population of nematodes in the roots of patchouli is 54.8 to 70.6%. Besides endophytic bacteria also can increase the growth and production of patchouli from 37.86 to 84.71%.
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