Predation of Coccinella septempunctata on young larvae of Spodoptera frugiperda.
To evaluate the control potential of Coccinella septempunctata adults on the 1st instar and 2nd instar larvae of Spodoptera frugiperda (J. E. Smith), the functional responses and mutual interference of C. septempunctata were studied in laboratory. The results showed that the maximum daily predation amount, the sequence of attacking efficiency and the handling time C. septempunctata adults on the 1st instars of S. frugiperda were 233.1, 1.204 and 0.103 h, respectively; and the values on the 2nd instars of S. frugiperda were 41.2, 1.075 and 0.582 h, respectively. The C. septempunctata adults gradually reduced their search activities as the density of prey increases. The predation of C. septempunctata was strongly affected by intraspecific interference. This study proves that C. septempunctata adults are efficient for the control of S. frugiperda and can be used in biological control of S. frugiperda in field.