Thermo Mediated Activity of Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) Predating on Rhizoecus amorphophalli Betren (Hemiptera: Rhizoecidae) on Elephant foot yam


  • Orissa University of Agriculture and Technology, Department of Entomology, Bhubaneswar, Odisha, India
  • Central Tuber Crops Research Institute, Regional Centre, Bhubaneswar, Odisha, 751 019, India


Elephant foot yam (Amorphophallus paeoniifolius Dennst.) tubers are infested with Oriental mealybug, Rhizoecus amorphophalli Betren in storage. The pest sucks and de-saps the cell content of tubers. It causes 10-15% infestation on the tubers leading to reduced vitality. The coccinellid, Cryptolaemus montrouzieri Mulsant is a potential predator of R. amorphophalli. Studies were carried out to determine the optimum temperature required for C. montrouzieri for controlling R. amorphophalli in storage. At 30°C, the population of R. amorphophalli was found to increase faster than at 20°C and 25°C. The population growth was not favoured at 35°C. The C. montrouzieri was found voraciously feeding R. amorphophalli at 25°C. Feeding activity of the C. montrouzieri declined between 30°C and 35°C. The temperature higher than 30°C was not conducive for survival of the predator and significant mortality was recorded at 35°C (P< 0.01). Studies revealed that the temperature range between 25°C and 30°C in storage is most suitable for release of C. montrouzieri for successful control of R. amorphophalli.


Elephant Foot Yam, Feeding Potential, Temperature, Cryptolaemus montrouzieri, Rhizoecus amorphophalli.

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