Eur. J. Entomol. 102 (1): 27-32, 2005 | DOI: 10.14411/eje.2005.004
Action of fenoxycarb on metamorphosis and cocoon spinning in Chrysoperla carnea (Neuroptera: Chrysopidae): identification of the JHA-sensitive period
- Dipartimento di Biologia, UniversitL di Ferrara, Via Borsari 46, 44100 Ferrara, Italy; e-mail: sbr@unife.it
Fenoxycarb is an insecticide with a juvenile hormone mimicking effect, which disturbs metamorphosis in several insect species, including the neuropteran Chrysoperla carnea. Administration of different doses of fenoxycarb to third instar larvae causes a dose dependent inhibition of metamorphosis and cocoon spinning. When treated within 48 h of the last larval ecdysis, this insect shows a temporary inhibition of metamorphosis and cocoon spinning, which leads to a prolongation of the third larval instar. When treated after 60 h into the last instar, most of larvae were unable to metamorphose and spin a cocoon. Thus, C. carnea is most sensitive to this juvenoid in the period after 60 h into the last larval instar.
Keywords: Chrysoperla carnea, juvenoids, fenoxycarb, development, metamorphosis, JH sensitive period
Received: February 16, 2004; Revised: June 7, 2004; Accepted: December 3, 2004; Published: March 25, 2005 Show citation
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