INVESTIGADORES
CINGOLANI Maria Fernanda
artículos
Título:
Negative interaction between twospotted spider mites and aphids mediated by feeding damage and honeydew
Autor/es:
CÉDOLA, C.; GUGOLE OTTAVIANO, M.F.; BRENTASSI, M.E.; CINGOLANI, M.F.; GRECO, N.M.
Revista:
BULLETIN OF ENTOMOLOGICAL RESEARCH
Editorial:
CAMBRIDGE UNIV PRESS
Referencias:
Lugar: Cambridge; Año: 2012 vol. 103 p. 233 - 240
ISSN:
0007-4853
Resumen:
Among the herbivorous arthropods that feed on strawberry, the most important
are the two-spotted spider mite (TSSM), Tetranychus urticae Koch, and several species
of aphids. Mites and aphids belong to different guilds that coexist in the field and feed
on the undersides of strawberry leaflets.However, the occurrence of large numbers of
individuals of both species on the same leaflet is rarely recorded. We hypothesize that
negative interactions between TSSM and aphids explain the intraplant distribution
of these herbivores. We first examined the spatial coincidence of both herbivores in
the field. Under experimental conditions, we then analyzed: (i) the rate of increase
of TSSM and the aphid Chaetosiphon fragaefolii (Cockerell), growing individually
and together; (ii) the effect of honeydew on TSSM preference; and (iii) the effect
of previous strawberry leaflet damage by TSSM on C. fragaefolii preference. The
proportion of TSSM that coincided with at least one aphid decreased as the
percentage of leaflets with TSSM increased. The spatial coincidence index between
aphids and TSSM increased together with the percentage of TSSM-infested leaflets.
TSSM showed both a lower rate of increase when they shared the same leaflet with
C. fragaefolii and lower fecundity on strawberry discs with honeydew. The rate of
increase of C. fragaefolii did not change on co-occupied leaves, but the aphid species
moved to the other side of leaflets shared with TSSM. Negative interactions resulting
in a tendency for species to avoid each other, such as demonstrated herein, can affect
distribution and performance of herbivorous arthropods.