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In autumn the production of chorophyll, the green pigment in leaves, slows to a halt. Carotenoids and anthocyanins, yellow, orange and dark red pigments, are exposed in the leaves, giving them their characteristic autumnal colors.

en.wikipedia.org/wiki/Autumn_leaf_color

Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous .... for more specialist aphid pests than do trees lacking bright leaves (autumn colors are useful only in those species coevolving with insect pests in autumn). ... The change of leaf colors prior to fall have also been suggested as ...

www.esf.edu/pubprog/brochure/leaves/leaves.htm

The guide features color images of the fall foliage of 47 tree and shrub species. ... of chemical processes that take place in the tree as the seasons change from ...

www.sciencemadesimple.com/leaves.html

Why do leaves change color in Fall? Learn why leaves change color and fall off the trees in autumn. Plus, get great science projects.

askabiologist.asu.edu/questions/why-do-leaves-change-color

In some areas of the world, the weather changes in the fall, making the air turn cold. During this time, many leaves also change colors. Why does this happen?

eekwi.org/veg/trees/treestruecolor.htm

A tree's roots, branches and twigs can endure freezing temperatures, but most leaves are not so tough. On a broadleaf tree ...

www.na.fs.fed.us/fhp/pubs/leaves/leaves.shtm

Although we don't know all the details, we do know enough to explain the basics and ... The timing of color change and leaf fall are primarily regulated by the ...

www.pbs.org/newshour/rundown/why-do-leaves-change-color

Oct 12, 2011 ... Which leads us to a question we rarely stop to ponder: why do leaves change to dazzling yellows, burnt oranges and deep red colors in the fall ...

www.ask.com/youtube?q=Why+Do+Leaves+Change+Color+in+the+Fall&v=Xk4-6II8l5Q
Oct 16, 2015 ... Autumn means leaves are turning different shades of red, orange, and yellow and falling to the ground. But why? Jessi takes you deep inside a ...

wonderopolis.org/wonder/why-do-leaves-change-color-in-autumn

Many people mistakenly believe that weather makes leaves change color. ... developed different stories and legends to explain why leaves turn colors in the fall.