Resumo

HURTADO LUNA, Leonardo  e  PEREZ SILVA, Blas. Physa cubensis (Pfeiffer, 1939) (Gastropoda: Physidae) in tobacco floating nurseries. Ctro. Agr. [online]. 2017, vol.44, n.3, pp. 43-48. ISSN 0253-5785.

ABSTRACT Natural fresh water constitutes the habitat of a great variety of fluvial mollusks in Cuba. The environmental, technological and social interactions generate transformation risks, as well as, processes of ecological degradation in the ecosystems whose consequences affect the biotic community. To evaluate the causes that produced the appearance of snails of the gender Physa cubensis (Pfeiffer) it was the objective of this study, developed in the tobacco floating nursery of the UCTB Cabaiguán Experimental Station, at the end of the tobacco campaign 2013-2014, during which damages were observed in the leaves of tobacco plantlets, related with the presence of this snails gender. Snails were manually collected, identifying each sample before the shipment to the laboratory. Census of snails in the floating nursery, showed a population constituted by 9 individuals / m² in each pool, which were in different development states, but no eggs. 9.33 % of plantlets of each tray showed areas with the typical scratch of the snail's radula, holes with irregular borders, up to the almost total destruction of the leaf area. The presence of Physa revealed the use of bad quality water for filling floats nurseries, so that mollusks found abundant feeding in the young plantlets. The study of combined control measures is recommended for this freshwater mollusk species in floating nurseries

Palavras-chave : Physa cubensis; floating nurseries; tobacco.

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