• K. Sahayaraj
  • R. Balasubramanian


Six artificial diets, devoid of insect components, were developed based on the feeding preference test for the predator Rhynocoris marginatus for mass production to control insect pest in agricultural ecosystem. Rhynocoris marginatus nymphs were successfully reared to adult in meat-based artificial diet, and these adults were subsequently able to reproduce. These results indicated that it is possible to rear this predator on a diet that completely excludes insect material. The diet based on pork liver was used as major source to approach the nutritional characteristics of the primary insect prey, Spodoptera litura. Rhynocoris marginatus was reared on different diets for three consecutive generations. Developmental time and preovipositional period were significantly longer, and egg viability, survival from egg to adult, and fecundity were significantly lower in Rhynocoris marginatus individuals reared on artificial diets than in those reared on Spodoptera litura. A significant reduction in developmental time, increase in survival from egg to adult, and reduction in length of the preovipositional period were observed after 3 generations of artificial diet-reared Rhynocoris marginatus on diet six. These changes may indicate that the predators experience some degree of adaptation to the diet after several consecutive generations of artificial diet rearing. No changes in egg viability were observed after three generations of artificial diet rearing. Although the average fecundity of a female was low for the oligidic diet was sufficient for sustaining continuous generation of Rhynocoris marginatus. There are three generations that have been obtained through continuous culture of this reduviid-fed meat diet. The meat-based diet tested was able to sustain the rearing of Rhynocoris marginatus for several generations without supplying any insect pest showing a good nymph survival rate. This study clearly shows that Rhynocoris marginatus can be reared on an oligidic diet that is economically producible and the fecundity of the female is significantly less than those reared on either Corcyra cephalonica or Spodoptera litura.


Predators rearing Biological traits Development Survival Fecundity Weight gain 


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Copyright information

© Springer Science+Business Media Singapore 2016

Authors and Affiliations

  • K. Sahayaraj
    • 1
  • R. Balasubramanian
    • 2
  1. 1.St. Xavier’s College, PalayamkottaiTirunelveliIndia
  2. 2.National Institute of VirologyAlappuzhaIndia

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