Can heat and resource availability affect the pest status of African crickets?

Chailleux Anaïs, Mwashimaha Robert, Nordey Thibault. 2021. Can heat and resource availability affect the pest status of African crickets?. International Journal of Tropical Insect Science, 41 (1) : 891-894.

Quartile : Q3, Sujet : ENTOMOLOGY

Note générale : Correction parue dans International Journal of Tropical Insect Science, 41, 895 (2021). https://doi.org/10.1007/s42690-020-00202-y

Résumé : Climatic changes, even transient events such as heatwaves, can markedly affect crop-insect interactions. Some insects might be favored or hampered in their development, but less clearcut interactions owing to changes in their needs or in agroecosystem resource availability, including in uncultivated surrounding areas, may mediate insect-crop interactions. In Tanzania, sudden and transient devastation of vegetable fields by crickets — which are usually considered as minor pests — raised this question. In this study, we sought to gain insight into whether sudden increased temperature and alternative food availability could affect the pest status of Gryllidae spp. Feeding damage on cabbage plants was measured under three temperatures in mesocosoms in climatic chambers. Tomato fruits were provided as an alternative food source. We demonstrated that Gryllidae spp. were able to feed on young cabbage, and that the damage level increased with temperature when no alternative food was available. Unexpectedly, the presence of alternative food increases feeding on the young cabbages. This case study highlighted how increased temperature could drive increased pest damage, raising concerns about climatic events that may substantially affect plant production in Africa through the interacting effects with insect herbivory.

Mots-clés Agrovoc : agroécosystème, changement climatique, ravageur des plantes, Brassica oleracea var. capitata, température, étude de cas, Gryllidae, insecte nuisible, produit alimentaire

Mots-clés géographiques Agrovoc : République-Unie de Tanzanie, Afrique

Mots-clés libres : Gryllidae, Cabbage, Climate Change, Global warming

Agences de financement hors UE : Institut National de la Recherche Agronomique, Centre de Coopération Internationale en Recherche Agronomique pour le Développement, AVRDC - The World Vegetable Center

Projets sur financement : (FRA) Transfer and adaptatation of agro-ecological practices aimed at boosting the autonomy of market gardeners and crop safety in sub-Saharan Africa

Auteurs et affiliations

• Chailleux Anaïs, CIRAD-PERSYST-UPR HortSys (SEN) - auteur correspondant
• Mwashimaha Robert, World Vegable Center (TZA)
• Nordey Thibault, CIRAD-PERSYST-UPR HortSys (BEN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605829/)

Métriques

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