Switching among natal and auxiliary hosts increases vulnerability of <i>Spodoptera exigua</i> (Hübner) (Lepidoptera: Noctuidae) to insecticides.

An obvious trend of decrease in mortality was observed from early instars to the later instars (Table 1 ).

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Percent mortality of the larvae which had a complete host switching cycle (natal host—auxiliary host—natal host) demonstrates an increasing trend in insecticidal efficacy (Figure 4 b).

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