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Entomotropica
Sociedad Venezolana de Entomologia
ISSN: 1317-5262
Vol. 16, No. 1, 2001, pp. 21-27
Bioline Code: em01007
Full paper language: English
Document type: Research Article
Document available free of charge

Entomotropica, Vol. 16, No. 1, 2001, pp. 21-27

 en
Francis Geraud-Pouey, Dorys T. Chirinos, Gustavo Romay

Abstract

GERAUD-POUEY F, CHIRINOS DT, ROMAY G. 2001. Physical effect of exfoliation of guava tree bark on Capulinia check for this species in other resources sp. near to jaboticabae von Ihering (Hemiptera: Eriococcidae). Entomotropica Vol 16(1):21-27.

Since it appeared in Venezuela in early 1993 the guava cottony scale, Capulinia sp. has become the greatest entomological problem on guava trees, Psidium guajava check for this species in other resources L. However in the field, trees with smooth bark (with little or without exfoliations) tend to be much less infested by this insect. Therefore, during May-July 1999 the physical effect of bark exfoliations on the establishment, survival and development of Capulinia sp. was assessed, in the laboratory. Three host plant /Criolla oja local selecction) conditions were included: with natural exfoliations, with bark mechanically smoothed (smooth bark) and exfoliations substituted by pieces of absorbent paper adhered to the smoothed bark (artificial exfoliations). Survival of first instar nymphs (crawlers) was significantly increased (>70%, P< 0.05) by the presence of exfoliations (natural and artificial) as places under which they settle down to feed. However, duration of development was little affected by the existence of exfoliations. Bark smoothness could constitute a source of resistance of guava plants to diminish the incidence and damages by Capulinia sp.

Keywords
Coccoidea, guava, guava cottony scale, host plant.

 
 es Efecto físico de las exfoliaciones de la corteza del guayabo ( Psidium guajava check for this species in other resources ) sobre Capulinia check for this species in other resources sp. cercana a jaboticabae von Ihering (Hemiptera: Eriococcidae)
Francis Geraud-Pouey, Dorys T. Chirinos, Gustavo Romay

Resumen

GERAUD-POUEY F, CHIRINOS DT, ROMAY G. 2001. Efecto físico de las exfoliaciones de la corteza del guayabo sobre Capulinia check for this species in other resources sp. cercana a jaboticabae von Ihering (Hemiptera: Eriococcidae). Entomotropica Vol. 16(1):21-27.

Desde su aparición en Venezuela a principios de 1993, la mota blanca del guayabo, Capulinia sp. ha constituido el problema entomológico de mayor relevancia en guayabo, Psidium guajava check for this species in other resources L. Sin embargo, en el campo se observa que plantas con corteza lisa (con pocas o sin exfoliaciones) son menos infestadas por este insecto. En consecuencia, durante el período mayo-julio de 1999 se evaluó en el laboratorio el efecto físico de las exfoliaciones de la corteza del guayabo sobre el establecimiento, la supervivencia y el desarrollo de Capulinia sp. Fueron incluidas tres condiciones de planta hospedera (selección local Criolla Roja): con exfoliaciones naturales, con corteza mecánicamente alisada (corteza lisa) y exfoliaciones sustituidas por pedazos de papel absorbente adherido a la corteza alisada (exfoliaciones artificiales). La supervivencia de las ninfas de primer instar fue significativamente incrementada (>70%, P<0,05) por las exfoliaciones (naturales y artificiales) como sitios debajo de los cuales se establecen para alimentarse. No obstante, la duración del desarrollo fue poco afectada por la condición física de la corteza. La corteza lisa podría constituir una fuente de resistencia del guayabo para disminuir la incidencia y daños por Capulinia sp. en ese frutal.

Palabras-clave
Coccoidea, escamas, guayaba, mota blanca del guayabo, planta hospedera.

 
© Copyright 2001 Sociedad Venezolana de Entomología
Alternative site location: http://www.entomotropica.org

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