Outbreaks of Schistocerca interrita (Scudder, 1899) in Northern Peru : [P abstract n°95]

Duranton Jean-François, Monard Annie, Solano Ricardo. 2001. Outbreaks of Schistocerca interrita (Scudder, 1899) in Northern Peru : [P abstract n°95]. Metaleptea (Special Meeting), Résumé, 1 p. International Conference of the Orthopterists' Society. 8, Montpellier, France, 19 Août 2001/22 Août 2001.

Résumé : A major locust outbreak attributed to Schistocerca interrita took place in Lambayeque department in 1982-1983. Few bioecology data are available to confirm that this was actually the species involved. Based on information obtained on the last two outbreaks, it seems that when there is abundant rainfall due to exceptional events (El Niño phenomena), Lambayeque desert becomes covered with abundant vegetation and thus suitable for Schistocerca interrita upsurges and gregarization during summer. Swarms then move up into the neighboring mountains during the dry season. They subsequently breed in the valleys during the next rainy season. The locusts reach sexual maturity around December, egg laying begins in January on the footslopes (at around 400-600 m elevation), and the eggs hatch some 20 days later. Hopper development then begins. and seems to last 2-3 months, with the hoppers gradually moving up the slopes to reach biotopes located above 2 500 m elevation by the last molt. When the populations are large enough, hopper bands form which decimate the vegetation they pass through. Swarms form around the peaks during the dry season. The life cycle then begins again with increased vigor when the species encounters suitable ecological conditions to ensure its survival and reproduction, which is often the case in the mountains west of Cajamarca. No appropriate control or accurate predictions are clearly possible until more data are collected on this species, especially since it lives in remote hard to reach areas.

Classification Agris : H10 - Ravageurs des plantes

Auteurs et affiliations

• Duranton Jean-François, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
• Monard Annie, FAO (ITA)
• Solano Ricardo, FAO (PER)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/533167/)

Métriques

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