Effect of extract and powder of leaves of Eucalyptus camaldulensis ( Dehnh) on some biological aspects of potato tuber moth Phthorimaea operculella ( Zeller ) in laboratory

Abstract

The research was conducted by using the ethanolic extract and powder of Eucalyptus leeves to evaluate their effect on some biological aspects of potato tuber moth in the laboratory . Results showed the important role of Eucalyptus extracts on potato tuber moth , the ethanolic extract of Eucalypt leeves prolonged the period of egg development which increased to 7.33 days by using 10000 ppm while the egg hatching percentage was decreased to 71 % at the same dose of extract , Adult emergence was decreased to74.67% and females fecundity decreased to 57.33 egg. Pupae treated with 10 % powder resulted in prolonged development period which reached to 15.33 days . Potato tubers treted with extract decreased number of egg on tubers by females to10.33 egg at 10000 ppm . There was also a clear effect for the ethanolic extract in larvae growth , percentage of number of first instar larva decreased by 91.3 % , and third instar larva decreased by 61 % when using 10000 ppm of ethanolic extract . These results indicated the possibility of using the natural materials of plants which are safe, cheep and active for pest control .