Vawa Et Al

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Vawa et al

Greener Journal of Agricultural Sciences Vol. 6 (9), pp. 262-271, October 2016.

 ISSN: 2276-7770 

Research Paper

Manuscript Number: 101416162


(DOI: http://doi.org/10.15580/GJAS.2016.9.101416162)

 

Host Status of Plantain Hybrids FHIA 21 and PITA 3 for
Populations of Radopholus similis and
Pratylenchus coffeae in Côte D’ivoire

 

*1Vawa Otro Serge Theodore, 2Adiko
Amoncho,

3Gnonhouri Goly Philippe, 4Otchoumou Atcho

 

1, 402 BP 801 Abidjan 02, Université
Nangui Abrogoua, Côte d’Ivoire.

2, 301 BP 1536 Abidjan 01, Centre National de
Recherche Agronomique, Côte d’Ivoire, Station de Bimbresso.

Abstract

Background:
The work herein reported has been conducted in the framework of the
implementation of the strategy of food security strategy in Côte d’Ivoire. In
this perspective, FHIA 21 and PITA 3, two high yielding plantain hybrids,
resistant to black Sigatoka have been assessed relatively to their response to Radopholus similis and Pratylenchus coffeae.

Methods:
FHIA 21 and PITA 3 were inoculated with increasing inoculum levels of the
parasites under monoxenic conditions: 5, 10, 15 and 20 R. similis or P. coffeae/g
roots and dixenic conditions: 3 R.
similis
and 3 P. coffeae; 5 R. similis and 5 P. coffeae; 10 R. similis and 10 P. coffeae; 10 R. similis
and 5 P. coffeae; 5 R. similis and 10 P. coffeae/g roots. The cultivar HORNE 1 served as susceptible
reference in both trials that were conducted in the glasshouse for eight weeks.

Results:
FHIA 21 appeared resistant to R. similis
(R=0.98) and susceptible to P. coffeae (R=2.99).
As to PITA 3, it was susceptible to both R.
similis
(R=2.47) and P. coffeae
(R=2.94). Host suitability was further confirmed when comparing nematode
reproduction under the hybrids to that under HORNE 1. FHIA 21 was designated
slightly resistant to R. similis with
a reproduction of 40.22 % and susceptible to P. coffeae (83.27%). The susceptibility of PITA 3 was also
confirmed to R. similis (83.27%) and P. coffeae (73.63%).

Conclusion:
With R. similis, the threshold of 10
nematodes/g of roots commonly used for rational nematicide applications in
banana cultivation was confirmed. In the light of the predominance of P. coffeae in banana and plantain
agrosystems in Côte d’Ivoire, the new reference threshold  of 5 P.
coffeae
/g roots is recommended for an effective management of
plant-parasitic nematode pressure.

 

Key words: Radopholus
similis, Pratylenchus coffeae,
Plantain hybrids, PITA 3, FHIA 21, HORNE 1, resistance, susceptibility, threshold

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