Journal of Pest Science

, Volume 84, Issue 1, pp 117–122 | Cite as

Effect of ivermectin on larval mortality and reproductive potential of Albizia foliage feeder, Spirama retorta Cramer (Lepidoptera: Noctuidae)

  • N. Roychoudhury
  • K. C. Joshi
Original Paper


Toxicity of ivermectin (Ivecop-12), a derivative of avermectin B, produced by a soil actinomycete, Streptomyces avermitilis, was evaluated in laboratory against the larvae of Spirama retorta Cramer (Lepidoptera: Noctuidae), a major stenophagous insect defoliator of Albizia spp. (family Leguminosae) in nurseries and young plantations. The study was conducted with eight treatment concentrations of lethal and sub-lethal doses. Results revealed that ivermectin is highly toxic and induce larval mortality when applied separately on host plant leaves and larvae, and on leaves and larvae of the insect pest together. The nature of treatment affects the larval mortality. Treatment of host plant leaves alone as well as leaves together with larvae showed 100% mortality by the treatment of 0.075% concentration whereas only 95% larval mortality was recorded due to larval treatment by the concentration of 1.2%. The LC50 value of the tested product was worked out to be 0.014, 0.170 and 0.012% for leaf and larval treatments separately and leaf and larval treatments together, respectively, against the insect pest. This clearly shows that ivermectin is more effective in larval killing when ingested through food. Further, the adults developed from treatments of sub-lethal concentrations and subsequently, when mated laid significantly (P < 0.05–0.01) less number of eggs and also showed significant (P < 0.05–0.01) reduction in hatching percentage compared to control. These observations suggest that the tested bioproduct, ivermectin, interfere physiological programming of larvae thereby causing alteration in fecundity and fertility of the target insect pest.


Ivermectin Toxicity Larval mortality Fecundity Fertility Spirama retorta 



Authors are grateful to Dr. A. K. Mandal, Director, Tropical Forest Research Institute, Jabalpur-482021 (M.P.), for providing necessary research facilities to carry out this work under the ICFRE intramural research project, entitled “Studies on the efficacy of toxins of soil actinomycetes against major forest insect pests” (ID No. 103/TFRI/2006/Ento-2(13).


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Forest Entomology DivisionTropical Forest Research InstituteJabalpurIndia

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