Tag Archives: chemical defense

Biologically active chemicals in yellow-cedar protect tree tissues and possibly human health

Nootkatone, a biologically active oxygenated sesquiterpene in yellow-cedar heartwood

Yellow-cedar trees, also known as Callitropsis nootkatensis, can live for hundreds of years because they have has few insect or pathogen pests. Periodic studies over the last century have examined extractable chemicals in their tissues and discovered

How leaf beetle produce toxins to defend themselves

Leaf beetles are insects that consume and destroy the leaves of the plants on which they live (host plant). Therefore, these beetles are pests of their corresponding host plant and cause economic damage, if this host plant

Harmonine – the defense compound of the Asian lady beetle is active against Leishmania major parasites

The Asian lady beetle (Harmonia axyridis) is known to consume large numbers of aphids and mites and has been, therefore, used as biological control of these pests worldwide. However, some populations began to establish locally and H.