Journal of Food Science and Technology

, Volume 55, Issue 6, pp 2270–2278 | Cite as

Potential of pyrethroid-synergised pyrethrum on stored product insects and implications for use as prophylactic sprays

  • Dikki Pedenla Bomzan
  • M. L. Bhavya
  • A. G. S. Chandu
  • S. Manivannan
  • G. Lavanya
  • K. Ramasamy
  • Akmal Pasha
Original Article


The study was conducted to evaluate the synergistic effects of 2% pyrethrum extract with synthetic pyrethroids on the mortality of stored product insects. Contact toxicity was performed at variable concentrations observing mortality at 12, 24 and 48 h durations. The results of the present study indicated that, pyrethrum + deltamethrin combination (25:1 ratio) was effective on the adults of Rhyzopertha dominica (F.) and Tribolium castaneum (Herbst). On the other hand, pyrethrum + cypermethrin combination proved effective against Sitophilus oryzae (L.). The efficacy of the tested combination showed reasonable increase in mortality response in treated insects over increasing exposures. At 48 h, 450 ppm pyrethrum + deltamethrin combination induced 25, 90 and 97% mortalities in S. oryzae, T. castaneum and R. dominica adults; while, pyrethrum-cypermethrin combination recorded 75, 45 and 75% mortalities respectively. On the other hand, it was observed that, among the pyrethrum alone treatments i.e. at 300, 450 and 600 ppm concentrations, maximum mortality (62.5%) was observed in S. oryzae exposed to 600 ppm pyrethrum for 48 h. The effective LC50 concentrations for pyrethrum (600 ppm) + deltamethrin combination was estimated to be as 0.1987 and 0.7039 µl/cm2 for R. dominica and T. castaneum adults respectively. Contrastingly, for treatments with S. oryzae, a LC50 value of 0.8673 µl/cm2 was recorded for pyrethrum (600 ppm) + cypermethrin mixture. This investigation strengthens the fact that pyrethrum along with pyrethroids is effective against storage insect pests which can be promisingly a safer insecticidal combination.


Pyrethrum Pyrethroids Stored product insects Synergism Prophylaxis 



We thank Prof. Ram Rajasekharan, Director, CSIR-Central Food Technological Research Institute, Mysore for his support and the facilities provided. The financial support for Agropathy, BSC-105 project from Council of Scientific and Industrial Research, New Delhi is gratefully acknowledged.

Supplementary material

13197_2018_3144_MOESM1_ESM.docx (12 kb)
Supplementary material 1 (DOCX 12 kb)


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Copyright information

© Association of Food Scientists & Technologists (India) 2018

Authors and Affiliations

  • Dikki Pedenla Bomzan
    • 1
  • M. L. Bhavya
    • 1
  • A. G. S. Chandu
    • 1
  • S. Manivannan
    • 1
  • G. Lavanya
    • 1
  • K. Ramasamy
    • 1
  • Akmal Pasha
    • 1
  1. 1.Food Protectants and Infestation Control DepartmentCSIR-Central Food Technological Research InstituteMysoreIndia

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