EFFICACY OF CONIFEROUS PLANT EXTRACTS [Pinus nigra Arnold AND Picea pungens Engelm.] AGAINST SOME STORED PEST SPECIES

The utilization of pesticides is a prevalent in the context of stored pest management.However, as an alternative due to the deleterious effects of pesticides, the use of plant extracts in pest control is becoming increasingly prevalent.In this study, the insecticidal effects of four different concentrations of plant extracts obtained from blue spruce (Picea pungens Engelm.) and black pine (Pinus nigra Arnold) were analyzed for Sitophilus oryzae L., Sitophilus granarius L. (Coleoptera: Curculionidae), and Tenebrio molitor L. (Coleoptera: Tenebrionidae).The application of S. oryzae in black pine at the lowest concentration resulted in a mortality rate of 57.56%, while S. granarius exhibited a mortality rate of 52.06% by day 15.In blue spruce, the respective mortality rates were 64.42% and 66.03%.The insecticidal effect of black pine extract on mealworms was observed to be lower at the lowest concentration than at the other three concentrations.In this trial, black pine was observed to be more effective than blue spruce in both plant extracts against mealworm, rice weevil, and wheat weevil.