n African Entomology - Effect of cover crop residues on white grubs and adults of (Coleoptera: Dynastidae) and on the damage they cause to upland rice




Black beetles ( 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 . Ten cover crop species were tested: , , and (Fabaceae); and (Poaceae); and (Asteraceae); (Capparaceae); and (Brassicaceae). Adding residues of , and resulted in significantly higher larval mortality than in the control treatments, while residues of had a marginally significant effect. Adding residues of , , , and significantly reduced damage caused by adult black beetles.


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