Crop protection. Visit to the GODPC / SIAT / Nucleus estate - smallholders and outgrowers : 23 to 28 February 2004

Philippe René. 2004. Crop protection. Visit to the GODPC / SIAT / Nucleus estate - smallholders and outgrowers : 23 to 28 February 2004. Montpellier : CIRAD-CP, 26 p. N° de rapport : CP_SIC 1703

Résumé : The time allowed for the visit was very short, so it was not possible to carry out a more detailed and more meticulous analysis than the one presented in this report. Nevertheless, it was possible to see the seriousness of the outbreak of this dangerous pest for oil palm throughout West Africa. For the Nucleus Estate (NES), the situation is highly catastrophic and is approaching the situation seen in 1985, which required aerial intervention in 1986-87 throughout the NES. The current situation (over 2 000 ha infested) arises from two main factors: - Unden stocks have run out on several occasions, or treatment cycles were ineffectual as they usually remained incomplete. - Hesitation in treating as some blocks were reserved for organic oil production. In fact, treatments lead to quarantining of plots treated with synthetic insecticides for a period of three years. - It is clear that other factors are also involved, given the large volume of work arising from this massive outbreak: programming of inspections, treatment dates linked to inspection frequency, etc. The deterioration in the phytosanitary condition of the NES has irremediably led to contamination of the Smallholders (1000 ha) and Outgrowers (over 1 000 ha), which are also very severely defoliated. This deteriorated situation in the Kwae zone results from three intensive pest multiplication cycles (i.e. 9 months), as in 1985 moreover. The Kwae site is therefore highly suitable for this oil palm leaf miner. Of course Coelaenomenodera does not kill the palms, but the very severe defoliation it causes simply induces an average 50% drop in production for two years. This effect is all the stronger the drier the climate is in the years following severe defoliation. Such an outbreak would have warranted aerial treatment if Unden powder at 75% a.i. or Evisect S had been sure to be available, but the latter was only available in December 2003, imported directly from Japan.

Auteurs et affiliations

• Philippe René, CIRAD-CP-COCOTIER (GHA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/520682/)

Métriques

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