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Natural predation on the cotton leafworm alabama argillacea lepidoptera noctuidae



Natural predation on the cotton leafworm alabama argillacea lepidoptera noctuidae



Journal of Economic Entomology 76(4): 779-784



Radioactive A. argillacea (Huebner) eggs and 1st instars were placed in an east Texas [USA] cotton field during 1982. The following arthropods showed evidence of predation on eggs: the insects Solenopsis invicta Buren, Orius tristicolor (White), Geocoris punctipes (Say), Tropiconabis capsiformis (Germar), Ceratocapsus sp., Pseudatomoscelis seriatus (Reuter), and a coccinellid larva; and the spiders Peucetia viridans (Hentz). Chiracanthium inclusum (Hentz), Aysha gracilis (Hentz), and Neoscona arabesca (Walckenaer). Predators of 1st instars included the insects S. invicta, G. punctipes, G. uliginosus (Say); and the spiders Misumenops sp., Tetragnatha laboriosa Hentz, A. gracilis, P. viridans, C. inclusum, Hentzia palmarum (Hentz); and an erigonid. Means for egg and small larval predation, after 48 h of exposure, were 88.7 and 88.4%, respectively. Predator efficiency values were calculated for all radioactive species captured and reported as number of eggs or larvae consumed per 24 h. The number of eggs consumed per predator per day ranged from 7.29 for Ceratocapsus sp. to 0.017 for S. invicta, and the number of larvae from 4.8 for A. gracilis to 0.41 for P. viridans.

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Accession: 005959317

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