Modified Ultrsonic Actograph for Monitoring Activity of Lepidopterous Larvae
Modified Ultrsonic Actograph for Monitoring Activity of Lepidopterous Larvae
Date
1986-12
Authors
Johnson, Marshall W.
Toscano, Nick C.
Jones, Vincent P.
Bailey, J Blair
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Hawaiian Entomological Society
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Abstract
An ultrasonic actograph was modified to detect the slow movements typical of lepidopterous larvae. A differential instrumentation amplifier increased the sensitivity of the instrument. Activity patterns of 5th instars of Spodoptera exigua (Hubner) (Lepidoptera: Noctuidae) and Sabulodes aegrotata Guenee (Lepidoptera: Geometridae) were determined using the modified actograph. S. exigua larvae were active ca. 339 minutes of the day with significantly greater photophase activity during 0600-1000 and 1100-1300 hrs as compared to scotophase activity during 0000-0400 and 2200-2400 his. S. aegrotata larvae were active ca. 421 minutes of the day with greater activity during the scotophase period.
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Johnson MW, Toscano NC, Jones VP, Bailey JB. 1986. Modified ultrsonic actograph for monitoring activity of Lepidopterous larvae. Proc Hawaiian Entomol Soc 27:141-146.
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6 pages
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