The effect of a weak electromagnetic field (36 GHz, 1 mu Wt) on the morphog
enesis of planarians Dugesia tigrina was studied. The asexual reproduction
of planarians (fission) served as an experimental model, It was shown that
wave radiation changes the dynamics of: fission in planarians, The effect w
as unstable and varied with season: the wave irradiation stimulated the fis
sion in spring and summer an inhibited it in winter, No effect of electroma
gnetic field was observed between these two periods, in autumn and early sp
ring.