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Advisor(s)
Abstract(s)
Acarological surveys were carried out fortnightly from March to June 2011 on
blackberries and weeds in a greenhouse at Fataca Experimental Farm in Odemira, in
order to study species diversity and population interaction. This study focused on two
blackberry cultivars, ‘Ouachita’ and ‘Karaka Black’.
Sixteen mite species were identified on blackberries. The redberry mite Acalitus
essigi (Hassan) was the most noxious mite in both cultivars, causing severe damage.
However, the late maturing Ouachita cultivar was the most attacked by this eriophyid
mite. The most common predacious mites were the stigmaeid Agistemus longisetus Gonzalez and the phytoseiids Amblyseius stipulatus Athias-Henriot and Amblyseius
californicus (McGregor).
From the 36 weed species identified, 22 were host plants of mites with
agricultural interest, 14 mite species being identified. Phytoseiids, especially A.
stipulatus, observed on 13 weed species, indifferent tydeids, in particular Orthotydeus
californicus (Banks), observed on 10 weed species, and the stigmaeid A. longisetus,
observed on seven weed species, were the predominant mites. These mite species also
occurred on blackberries.
The most important host weeds of mites were Amaranthus deflexus L.,
Chenopodium murale L., Conyza bonariensis (L.) Cronq., Conyza canadensis (L.) and
Solanum nigrum L., mainly associated to predators, A. stipulatus and A. longisetus.
From acarological point of view, safeguarding the competition relatively to some
vegetal species, ground cover vegetation can be an important component of
conservation biological control in blackberry crop, because host weeds of mites are
mostly repositories of predacious species
Description
Keywords
Acalitus essigi Agistemus longisetus phytoseiids Odemira
Pedagogical Context
Citation
"Actas Portuguesas de Horticultura". ISBN 978-972-8936-12-9. 20 (2012) 76-83