The Effect Concentrations of alcoholic extract for terpenes and flavonoids and alkaloids from Silybum marianum seeds in combating larva stage in lesser grain borer Rhyzopertha dominica (Fab) (Bostrichidae: Coleoptera)


This study was included the effectiveness Three concentrations each of the extract (1, 4, 7 g/ 100 g ml) for extract of the terpenes,flavonoids and alkaloids from Silybum marinum seeds in larva stage for Lesser grain borer Rhyzopertha dominica under conditions at temperature 1±29 °c, 5± 70% relative humidity. The concentrations 7% for each of the extract flavonoids, terpenes and alkaloids gave higher rate of perdition amounted to 65, 85, 90% respectively compared with the others focus for extracts of the alkaloids, flavonoids and terpenes which recorded the highest rate of depreciation amounted to 45, 55, 70% has dropped to 30, 35, 50% when you focus on the 1%, respectively.,with an increase in the percentage of the total and partial emergence distortion to reach 25% when the concentration of 4% to extract terpenes with decreases to 30, 35, 50% in 1% to extract alkaloids, terpenes and flavonoids