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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 69, No. 2, 2009, pp. 160-170
Bioline Code: cj09019
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 69, No. 2, 2009, pp. 160-170

 en Life table parameters and consumption rate of Cydnodromus picanus check for this species in other resources ragusa, Amblyseius graminis check for this species in other resources Chant, and Galendromus occidentalis check for this species in other resources (Nesbitt) on avocado red mite Oligonychus yothersi check for this species in other resources (McGregor) (Acari: Phytoseiidae, Tetranychidae)
Rioja, Tommy & Vargas, Robinson

Abstract

The avocado red mite Oligonychus yothersi check for this species in other resources (McGregor) is the major leaf pest in Chile′s avocado orchards. Itaffects leaf physiology and makes it necessary to seek new natural enemies to interact with low population densities of O. yothersi . The potentiality of three predator mites: Cydnodromus picanus check for this species in other resources Ragusa, Amblyseius graminis check for this species in other resources Chant, and Galendromus occidentalis (Nesbitt) was evaluated under laboratory conditions (27±1.93ºC, 87±3.61% H.R. and 16:8 (L:D) photoperiod) on avocado leaf disks Persea americana Mill. var. Hass (Ø = 5 cm) by separately feeding eggs, immature, and adult females of O. yothersi , and registering postembryonic development, consumption, as well as life table parameters. The postembryonic development of C. picanus was significantly lower (5.46 days) compared to both A. graminis (7.33 days) and G. occidentalis (8.69 days) which were fed with immature O. yothersi . The life table parameters of C. picanus were Net Reproductive Rate R 0 = 25.41, Finite Rate of Increase ë = 1.29, and Mean Generation Time T = 12.46. The Net Intrinsic Rate of Increase (r m ) was significantly higher for C. picanus (r m = 0.25) in contrast with G. occidentalis (r m = 0.19), while A. graminis showed r m = -0.06 indicating that its population didn′t have descendants. Under laboratory conditions, r m registered by C. picanus is an indicator of its predatory potential to control O. Yothersi . It can be assumed that the pest population reduction pattern could be maintained under field conditions.

Keywords
postembryonic development, predation, pollen, biological control.

 
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