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Responses of spodoptera exigua lepidoptera noctuidae larvae to light

, : Responses of spodoptera exigua lepidoptera noctuidae larvae to light. Environmental Entomology 14(5): 650-653

Influence of light on larvae movement and distribution was investigated for the beet armyworm (BAW), Spodoptera exigua (Hubner), in the laboratory and the field. Laboratory tests with five light intensities ranging from 0-3,400 lix indicated that first instars were photopositive, second instars were weakly photonegative, neither third nor fourth instars responded behaviorally to light, and fifth instars demonstrated a strong photonegative reaction. Distribution within celery plants for fourth instars ws unaffected by light in the laboratory. Fifth instar larvae responded to light in both the laboratory and the field: most larvae were found on leaves during dark phase, while during light phase a significant majority was observed in sheltered areas in celery hearts or on the ground. Implications for sampling BAW based on these results are discussed.


DOI: 10.1093/ee/14.5.650

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