Population growth of Tetranychus urticae Koch (Acari: Tetranychidae) and predation rate of the pest mite by Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae) in two grape cultivars

The two-spotted spider mite, Tetranychus urticae Koch, has caused significant damage to vineyards in the valley of São Francisco River Brazil. Neoseiulus idaeus Denmark & Muma is one most abundant species predatory mites on vines this region. This study evaluated population growth rates T. leaves two grape (Vitis vinifera L.) cultivars (‘Italia’ and ‘Superior Seedless’) jack bean [Canavalia ensiformis (L.) DC.] and, also, estimate predation pest mite by N. both bean. A higher oviposition rate was observed Seedless’ than ‘Italia’ leaves; however, there no difference instantaneous for these cultivars. For Seedless’, egg viability significantly lower grape, indicating a resistance factor cultivar. phytoseiid preyed number females densities 10 20 per leaf arena (9 cm2). Evaluations trichomes indicated occurrence longer basal portion main veins leaves. presence may be associated with better performance