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The fall armyworm,  Spodoptera frugiperda , (hereafter FAW) is a major pest in South American crops; however, knowledge about its potential native natural predators is limited. Size is a factor that constrains predators against prey, such as larvae of varying sizes. The predation capability of males and females of the native wolf spiders  Lycosa thorelli  and  Pavocosa  sp. were evaluated against different-sized FAW larvae. Contrary to expected results, both sexes consumed FAW larvae of similar size ranges.  L. thorelli  captured larger FAW larvae, suggesting this species might prey on a wider range of FAW instars indicating its potential role as a FAW biological control agent.

biocontrol science and technology

Intra- and inter-specific effects in prey size capture by wolf spiders (Araneae: Lycosidae) against the fall armyworm  Spodoptera frugiperda  under laboratory conditions