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Title: Modified Ultrsonic Actograph for Monitoring Activity of Lepidopterous Larvae 
Author: Johnson, Marshall W; Toscano, Nick C; Jones, Vincent P; Bailey, J Blair
Date: 1986-12
Publisher: Hawaiian Entomological Society
Citation: 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.
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.
Pages/Duration: 6 pages
ISSN: 0073-134X
URI: http://hdl.handle.net/10125/11217

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