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Original Articles

Life tables and thermal constants of Pediculaster mesembrinae (Acari: Siteroptidae) fed on the Fungus, Trichoderma harzianum Rifai

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Pages 165-170 | Published online: 17 Mar 2009
 

Abstract

Life and fecundity table studies on Pediculaster mesembrinae (Canestrini) (Acari: Siteroptidae) were conducted under controlled conditions (15, 20, 25 and 30°C, relative humidity 60 ± 5 %), using cohorts of 40 individually confined mites in observation arenas. Fermented wheat straw (compost) previously inoculated with Trichoderma harzianum Rifai spores was used as substrate and food source. The study started with mite eggs approximately 5 h old. The life cycle of P. mesembrinae included the stages of egg, larva, quiescent larva or nymphocrysalis, and adult; only females were observed in our population. The length of the life cycle, as well as total longevity, showed an inverse (linear) relation with temperature. Values of rm (intrinsic rate of increase) were 0.146, 0.132, 0.170 and 0.204, for 15, 20, 25 and 30°C, respectively. Developmental rates had a direct and linear relationship with temperature; and threshold temperatures ranged between -0.53 and -3.22°C. Development from egg to adult required 152 degree days.

RESUMEN

Se realizó un estudio sobre tablas de vida y fecundidad de Pediculaster mesembrinae (Canestrini) (Acari: Siteroptidae) en condiciones controladas (15, 20, 25 y 30°C; humedad relativa 60 ± 5 %) con cohortes de 40 áros confinados individualmente en arenas de observación. Paja de trigo fermentada (composta) inoculada con esporas de Trichoderma harzianum Rifai fue usada como sustrato y alimento. El estudio inició con huevos de aproximadamente 5 h de edad. El ciclo de vida de P. mesembrinae incluyö estadios de huevo, larva, larva quiescente o ninfocrisálida, y adulto; solo se observaron hembras en esta población. La duración del ciclo de vida y la longevidad total tuvieron una relación inversa (lineal) con la temperatura; los valores de rm (tasa intríseca de incremento) fueron de 0.146, 0.132, 0.170 y 0.204 a temperaturas de 15, 20, 25 y 30°C, respectivamente. La relación entre tasas de desarrollo y temperatura fue lineal, directa; las temperaturas umbral oscilaron entre -0.53 y -3.22°C. El desarrollo de huevo a adulto requirió de 152 grados día.

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