Resumo

MIRANDA CABRERA, Ileana et al. Coexistence of Empoasca kraemeri Ross and Moore (Homoptera: Cicadellidae) and Thrips palmi Karny (Thysanoptera: Thripidae) in Phaseolus vulgaris L.. Rev. Protección Veg. [online]. 2016, vol.31, n.3, pp. 165-172. ISSN 2224-4697.

Generally, the densities of phytophagous insects decrease in the field after an intense rain. For evaluating this assumption and demonstrating the coexistence of pests in the bean crop, the insect pests present in the common bean variety BAT 306 were sampled from December 2015 to March 2016.  The samples were always taken the day after a rainy day.   A five fixed quadrant design was used. Population density was monitored from the day 32 after planting by counting the leafhoppers, thrips, and whiteflies on five random plants in each quadrant. Taylor’s power law was used to determine the spatial pattern distribution of the insects with the highest incidence; population dispersion per sampling was graphed.  Inter-specific competition was evaluated using mathematical models, and an analysis of principal components was made to determine the relationships between the populations and some climatic factors. The average density of whiteflies was less than 0.28 individuals by sample. The leafhopper was identified as Empoasca kraemeri and the thrips as Thrips palmi. These two species populations were shown to coexist with an aggregate pattern distribution and an intrinsic rate (r_m) of 0.11 and 0.09, respectively, once the crop reached the reproductive stage.  Despite the inverse relationship between the accumulated precipitations and the population levels, rainfall values over 60 millimeters did not achieve density zero. Wind speed, deficit of saturation, and sunshine were directly related to the densities of these vector insects

Palavras-chave : Thrips palmi; Empoasca kraemeri; intrinsic increment rate; spatial pattern distribution; inter-specific competence.

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