Invasive Species Compendium

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Abstract

Predation of Picromerus lewisi nymph on larvae of Spodoptera frugiperda.

Abstract

The predation potential of Picromerus lewisi(Fallou) to Spodoptera frugiperda(J.E. Smith) was evaluated using P. lewisi nymph and 3rd, 4th and 5th instar larvae of S. frugiperda under indoor conditions. The results showed that the maximum daily predation amount of P. lewisi 3rd nymph to the 3rd, 4th and 5th instar larvae of S. frugiperda was 55.556, 8.019 and 5.666, respectively. The instantaneous attacking rates were 0.819, 1.826 and 1.503, respectively. The handling time was 0.018, 0.125 and 0.177 day, respectively. The maximum daily predation amount of P. lewisi 4th nymph to the 3rd, 4th and 5th instar larvae of S. frugiperda was 60.753, 19.924 and 10.325, respectively. The instantaneous attacking rates were 0.993, 1.664 and 0.968, respectively. The handling time was 0.017, 0.050 and 0.968, respectively. The maximum daily predation amount of P. lewisi 5th nymph to the 3rd, 4th and 5th instar larva of S. frugiperda was 65.789, 23.635 and 12.331, respectively. The instantaneous attacking rates were 1.021, 1.307 and 0.863, respectively. The handling time was 0.015, 0.042 and 0.081, respectively. P. lewisi 3rd-5th nymph can prey on 3rd, 4th and 5th instar larvae of S. frugiperda, with predation amount to the 3rd instars the largest, preference more for the 4th and 5th instars, and attacking efficiency to the 4th instars the highest. The results indicate that P. lewisi has good control effect on S. frugiperda and can be used for the prevention and control of this pest.