  We present and discuss the results of measurements of the ab-plane
resistivity of La_{2-x}Sr_{x}CuO_{4} single crystals with small Sr contents
(x=0.052-0.075). The resistivity was obtained in the temperature range between
4.2 K and 300 K by using an AC Van der Pauw technique. When the temperature is
lowered, the rho_{ab}(T) curves show a transition from a linear behaviour to a
semiconducting-like one. The deviation from the linearity occurs at a
doping-dependent temperature T_{ch}. This effect can be interpreted as due to a
progressive pinning of preexistent charge stripes. In the same framework, the
appearance of anomalous sharp peaks in the rho_{ab}(T) curves of
superconducting samples just above T_{c} may be explained by a transition from
a nematic to a more ordered smectic electronic stripe phase.
