Journal: |
Egyptian Academic Journal of Biological Sciences B. Zoology
Ain shams University
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Volume: |
14
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Abstract: |
In the last years, the concept of proper sustainability, cost potency
of plant growth-promoting bacteria, and organic manures drive us to focus
on their exploration in agriculture. Laboratory effectiveness of Serratia
spp. and Pseudomonas spp. isolates against egg hatching and infective
juvenile mortality of the root-knot nematode, Meloidogyne incognita was
determined. As well as performance evaluation of composted chicken
manure (CM) inoculated with bacteria under greenhouse and field
conditions on vegetable plants, cucumber, pepper, potato and tomato
besides banana. In vitro results after the 5ᵗʰ day of inoculation, S.
marcescens (A10) and Pseudomonas fluorescens PF131 isolates gained
the highest inhibition of egg hatching (85.18 and 75.36%). While juvenile
mortality percentages were 43.30 and 35.10% with S. marcescens (A10)
and P. putida (PP29), respectively. The nematicidal effect of the tested
rhizobacteria on M. incognita inhibited egg hatching and juvenile
mortality was directly proportional to isolates and exposure time. Under
greenhouse conditions, the interaction between rhizobacteria and CM
increased the fresh potato plant's shoot weight (31.78%) and root weight
(28.94 %). Furthermore, the decrease in the number of galls, egg masses,
IJs/100 g soil, and RF population significantly to 69.57%, 63.37%, 12.40,
and 0.147, respectively. Under field conditions, the combination of
chicken manure seems to be responsible for the sustainability of
rhizobacteria in situ and extends their potency for a long period. After 20
days of the field application (1.8×10⁸ cfu/ml; 15 L /Fed), the reduction
percentages in IJs in blocks treated with the mixture of rhizobacteria and
CM were 88.94, 87.92, 91.27, and 9276 % in tomato, cucumber, pepper,
and banana plants, respectively. Our results indicate that the chicken
manure inoculated with rhizobacteria is a promising biocontrol agent
mixture for control of M. incognita in infected vegetables and orchard
fields heavily infested.
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