Pesquisa Agropecuária Brasileira (2003) 38, 453-458

Anderson Mathias Holtz, Hamilton Gomes de Oliveira, Angelo Pallini, Jeanne Scardini Marinho, José Cola Zanuncio and Claudinei Lima Oliveira (2003)
Adaptação de Thyrinteina arnobia em novo hospedeiro e defesa induzida por herbívoros em eucalipto
[Adaptation of Thyrinteina arnobia to a new host and herbivore induced defense in eucalyptus]
Pesquisa Agropecuária Brasileira 38 (4), 453-458
Abstract: The induced defense system of plants is activated when herbivorous start to injury plants. Alternatively, herbivores may adapt to plants that are phylogenetically close to their original host. This work aimed at comparing the life history of Thyrinteina arnobia on guava plants (origin host) with eucalyptus (the new host) in the field. The biology of the insect in the laboratory on both eucalyptus leaves previously injured by the caterpillars of T. arnobia and on clean leaves was also studied. In the field, the larvae survivorship of T. arnobia on eucalyptus was 78.00% and on guava was 29.33%. The larvae cycle was 27.90 days on guava and 30.30 days on eucalyptus. At the laboratory, tests showed that the larvae cycle on clean eucalyptus leaves lasted 36.39 days while on previously injured leaves, only 32.89 days. The larvae mortality on injured eucalyptus leaves was 30.00%, and 10.00% on clean leaves. The results indicate that guava plants are not a suitable host for T. arnobia probably due to a more effective defense system. Although the eucalyptus may be a better host, it can also reduce the herbivore population by activating its herbivore induced defense system.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): José Cola Zanuncio

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Thyrinteina arnobia	Guava (Psidium)
	Thyrinteina arnobia	Eucalypt (Eucalyptus)