Life cycle, reproductive maturation, and wing color changes in Nomadacris septemfasciata (Orthoptera: Acrididae) in Madagascar

Franc Alex, Luong-Skovmand My-Hanh. 2009. Life cycle, reproductive maturation, and wing color changes in Nomadacris septemfasciata (Orthoptera: Acrididae) in Madagascar. Environmental Entomology, 38 (3) : 569-576.

Quartile : Q2, Sujet : ENTOMOLOGY

Résumé : Red locusts, Nomadacris septemfasciata (Serville, 1838), frequently damage crops in Madagascar, and this problem has worsened in recent years, likely because of intensive deforestation. Little isknownabout this pest in Madagascar, contrary to southern Africa.Westudied the reproductive maturation in relation to climate and vegetation in northwestern Madagascar. Our results show that adults overwinter, with females undergoing a 6- to 7-mo-long reproductive diapause, followed by a variable quiescent period of 2-4 wk, depending on ecological conditions, during which vitellogenesis is delayed,. Food availability in response to good rains at the end of spring seems to be the key factor for triggering the end of quiescence and the beginning of rapid vitellogenesis (=reproductive maturation). Hind wing color in adults changes throughout the year and was correlated with age and reproductive state in females and seasonal climate change.

Mots-clés Agrovoc : Nomadacris, cycle de développement, couleur, diapause, maturité sexuelle

Mots-clés géographiques Agrovoc : Madagascar

Mots-clés complémentaires : Nomadacris septemfasciata

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Franc Alex, CIRAD-BIOS-UPR Acridologie (FRA)
• Luong-Skovmand My-Hanh

Source : Cirad - Agritrop (https://agritrop.cirad.fr/550054/)

Métriques

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