Effect of Developmental Stage and Density of Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) on the Predatory Performance of Four Coccinellid Predators


Affiliations

  • Indian Agricultural Research Institute, Biological Control Laboratory, Division of Entomology, New Delhi, 110 012, India
  • Indian Agricultural Research Institute, Biological Control Laboratory, Division of Entomolog, New Delhi, 110 012, India
  • National Research Center on Pomegranate, Solapur, Maharashtra, 413 255, India

Abstract

The predatory performance of four coccinellid predators, viz., Hyperaspis maindroni, Cryptolaemus montrouzieri, Nephus regularis and Scymnus coccivora, was studied on Phenacoccus solenopsis under laboratory conditions at 27 ± 2°C and 65 ± 5% RH. The grubs of all the four predators preferred to prey upon second instar mealybugs followed by third instars and adults when given the choice and fourth instar grubs were the most voracious. The overall predation by the grubs of C. montrouzieri (170.40 mealybugs) was significantly higher than that of the rest of the species. The rate of predation was dependent on developmental period and per day consumption of grubs of all the stages decreased with increase in size of the mealybug. Mean number of P. solenopsis individuals consumed and number of eggs laid per day by the females of all the predators increased gradually with prey density from lower to higher densities, but at a decreased rate.

Keywords

Phenacoccus solenopsis, Hyperaspis maindroni, Cryptolaemus montrouzieri, Feeding Potential, Nephus regularis, Scymnus coccivora, Starvation Potential.

Subject Discipline

Entomology

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