Anti-insect activity of plant extracts from the wild flora in southeastern Spain.
Plant extracts of a group of 57 species from 21 botanical families, harvested in southeastern Spain, were screened for anti-insect activity using Tribolium castaneum. Echium creticum, Lepidium graminifolium, Anacyclus clavatus, Galactites duraei, Helichrysum decumbens, Senecio vulgaris, Pallenis spinosa, Ecballium elaterium, Haplophyllum linifolium and Solanum bonariense were active in most tests. Ballota hirsuta inhibited growth in larvae. Ononix natrix, Lavatera cretica and Urginea maritima (bulb) had contact toxicity to pupae (100% mortality). Compositae had a tendency to induce either growth inhibition (with or without mortality) or repellency in the target insect. Overall, 70% of the extracts tested showed some activity and 21% of them (including endemisms) were newly identified.