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Effect of cover crop residues on white grubs and adults of Heteronychus bituberculatus (Coleoptera: Dynastidae) and on the damage they cause to upland rice

Rafarasoa L.S., Letourmy P., Naudin K., Andrianantoandro A., Rajaonera T.E., Randriamanantsoa R., Ratnadass A.. 2016. African Entomology, 24 (1) : p. 75-79.

Black beetles (Heteronychus spp., Coleoptera: Dynastidae) are significant pests of upland rice in the Central Highlands of Madagascar, particularly in some conservation agriculture (CA) systems. On the other hand, certain species of cover crops used in CA systems may have a suppressive effect on black beetle populations or reduce the damage they cause to rice plants. Between 2009 and 2011, we conducted a laboratory study on the possible effects of adding dried ground plant parts (hereafter 'residues') to the soil on larvae (white grubs) and adults (black beetles) of Heteronychus bituberculatus. Ten cover crop species were tested: Cajanus cajan, Crotalaria grahamiana, Desmodium intortum and Vicia villosa (Fabaceae); Brachiaria ruziziensis and Eleusine coracana (Poaceae); Cosmos caudatus and Tagetes minuta (Asteraceae); Cleome hirta (Capparaceae); and Raphanus sativus (Brassicaceae). Adding residues of C. grahamiana, E. coracana and C. caudatus resulted in significantly higher larval mortality than in the control treatments, while residues of R. sativus had a marginally significant effect. Adding residues of C. grahamiana, C. caudatus, C. hirta, T. minuta and R. sativus significantly reduced damage caused by adult black beetles. (Résumé d'auteur)

Mots-clés : utilisation des déchets; couverture du sol; protection des plantes; agroécologie; lutte biologique; raphanus sativus; tagetes; cosmos; eleusine coracana; brachiaria ruziziensis; vicia villosa; desmodium intortum; crotalaria; cajanus cajan; déchet agricole; heteronychus; riz pluvial; oryza sativa; madagascar; cleome hirta; crotalaria grahamiana

Thématique : Ravageurs des plantes; Protection des végétaux - Considérations générales; Culture des plantes

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