Piercing-sucking pests infest many strategic crops worldwide, causing significant damage to crops. Botanical natural products provide several promising pesticide agents that could control these pests as an alternative to the negatively impacted synthetic insecticides. Bioassay-guided separation of the alkaloid fraction of Quassia amara Linn. woody parts against two serious pests ( Aphis craccivora Koch and Tetranychus urticae...