Cover cropping alters the diet of arthropods in a banana plantation: A metabarcoding approach

Mollot Grégory, Duyck Pierre François, Lefeuvre Pierre, Lescourret Françoise, Martin Jean François, Piry Sylvain, Canard Elsa, Tixier Philippe. 2014. Cover cropping alters the diet of arthropods in a banana plantation: A metabarcoding approach. PloS One, 9 (2):e93740, 9 p.

Quartile : Q1, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : Plant diversification using cover crops may promote natural regulation of agricultural pests by supporting alternative prey that enable the increase of arthropod predator densities. However, the changes in the specific composition of predator diet induced by cover cropping are poorly understood. Here, we hypothesized that the cover crop can significantly alter the diet of predators in agroecosystems. The cover crop Brachiaria decumbens is increasingly used in banana plantations to control weeds and improve physical soil properties. In this paper, we used a DNA metabarcoding approach for the molecular analysis of the gut contents of predators (based on mini-COI) to identify 1) the DNA sequences of their prey, 2) the predators of Cosmopolites sordidus (a major pest of banana crops), and 3) the difference in the specific composition of predator diets between a bare soil plot (BSP) and a cover cropped plot (CCP) in a banana plantation. The earwig Euborellia caraibea, the carpenter ant Camponotus sexguttatus, and the fire ant Solenopsis geminata were found to contain C. sordidus DNA at frequencies ranging from 1 to 7%. While the frequencies of predators positive for C. sordidus DNA did not significantly differ between BSP and CCP, the frequency at which E. caraibea was positive for Diptera was 26% in BSP and 80% in CCP; the frequency at which C. sexguttatus was positive for Jalysus spinosus was 14% in BSP and 0% in CCP; and the frequency at which S. geminata was positive for Polytus mellerborgi was 21% in BSP and 3% in CCP. E. caraibea, C. sexguttatus and S. geminata were identified as possible biological agents for the regulation of C. sordidus. The detection of the diet changes of these predators when a cover crop is planted indicates the possible negative effects on pest regulation if predators switch to forage on alternative prey.

Mots-clés Agrovoc : Musa, agroécosystème, Brachiaria decumbens, plante de couverture, méthode de lutte, lutte antiravageur, Cosmopolites sordidus, ravageur des plantes, écologie animale, insecte utile, nutrition animale, désherbage

Mots-clés géographiques Agrovoc : Martinique, France

Classification Agris : H10 - Ravageurs des plantes
H60 - Mauvaises herbes et désherbage
F08 - Systèmes et modes de culture

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Mollot Grégory, PRAM (MTQ)
• Duyck Pierre François, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0001-5484-1970
• Lefeuvre Pierre, CIRAD-BIOS-UMR PVBMT (REU)
• Lescourret Françoise, INRA (FRA)
• Martin Jean François, Montpellier SupAgro (FRA)
• Piry Sylvain, INRA (FRA)
• Canard Elsa, PRAM (MTQ)
• Tixier Philippe, CIRAD-PERSYST-UPR Systèmes de culture bananes et ananas (CRI) ORCID: 0000-0001-5147-9777

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573119/)

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