Abstract
Distribution of Luehdorfia puziloi inexpecta at Mt Akagi was first confirmed in 1940. Since then, there have been remarkable changes in the environment supporting its habitat and the population has undergone rapid degradation. Changes in the utilization of land at Mt Akagi were investigated, and it became clear that the main cause of the population degradation was the replacement and fragmentation of the broad-leaved deciduous forest habitat by coniferous forests and agricultural fields. The situation was also further aggravated by the decrease in the number of foresters. To prevent further population decrease, the method of 'protective netting' covering of food plant and eggs was examined, and good results were obtained. This method was found to be an effective conservation approach for urgently minimizing impermanent population decreases.
