Superstructure reflections due to charge ordering have been observed in La1
-xSrxMnO3 single crystals using X-ray diffraction.. The critical temperatur
es for the ordering process are 150 K and 180 K in samples with Sr concentr
ations of 12.5% and 15%, respectively. For x = 0.125 the charge order trans
ition correlates with a drastic resistivity enhancement, while a much small
er change of the resistivity is found for x = 0.15. It is argued that the o
nset of charge ordering in the sample with z = 0.125 is related to the supp
ression of co-operative Jahn-Teller distortions which is initiated by risin
g ferromagnetism.