Abstract
The ultrastructural damage to the spermatid organelles of Locusta migratoria was studied after one injection of 10 microliter isopropoxy phosphine at 5th instar stage. The effects were prevalent after three to four weeks. Vacuolation was observed in nuclei of early spermatids. Some nuclei of advanced spermatids had crinckled nuclear wall. Occasionally, the nebenkern and its derivatives showed vacuolation. The formation of supernumerary flagellar complexes also occurred in some spermatids. Sometimes, the flagellar filaments were disorganized. The results are more or less similar to those which followed x-ray irradiation and corpora allata implantation.
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