Insects cause great damage to agricultural crops. A secondary effects of pest is viral, bacterial and fungal infection where are facilitated by the damages and injured to crop plants by insects and mites. The yield loss of crops by nibbling, injury and growth retardation is estimated to be 20% - 30%. An additional 10% is lost during post harvest storage and transportation. Decrease in crop quality causes further economic loss. | Biopesticidal activity of lichenic extracts against the grain storage pests tribolium castaneum and sitophilus oryzae
