Predation potential of Chilocorus cacti (Coleoptera: Coccinellidae) to the prickly pear cacti pest Dactylopius opuntiae (Hemiptera: Dactylopiidae).
Functional response of the predator Chilocorus cacti (Linnaeus) (Coleoptera: Coccinellidae) on five densities of Dactylopius opuntiae (Cockerell) (Hemiptera: Dactylopiidae) female adults was assessed under laboratory conditions. The searching efficiency of C. cacti significantly decreased as prey density increased. The logistic regression for the predator had a negative and significant linear parameter indicating a type II functional response. Non-linear regression for Holling predator equation estimated a handling time of 1.79 ± 0.129 h and attack rate coefficient of 0.1003 ± 0.030. Most of this handling time was because the predator spent a lot of time removing the waxy coating that protects adult females of D. opuntiae. Chilocorus cacti consumes females of D. opuntiae in their reproductive stage; therefore, it could be an effective natural enemy to suppress or regulate low density populations of D. opuntiae, preventing them to reach high densities.
Depto de Producción Agrícola y Animal, Univ Autónoma Metropolitana, Hueso 1100, Villa Quietud, DF, 04960, México. afloresm@correo.xoc.uam.mx
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Rodríguez
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Barranco
D000818:Animals; D061046:Biological Control Agents; D001517:Coleoptera / Q000502:physiology*; D005260:Female; D006430:Hemiptera / Q000502:physiology*; D029747:Opuntia / Q000469:parasitology*; D010572:Pest Control, Biological / Q000379:methods*; D011235:Predatory Behavior
D061046:Biological Control Agents