turn yellow

A green dot on the app will turn yellow or red when there are more urgent emergencies, such as a fire or a burglary in progress, to watch out for in users’ neighborhoods.

If it rains, the harvested leaves must be dried very quickly — within a day — otherwise they turn yellow and no one wants them.

“Just like tea, it will bleach and turn yellow — and people say it might also get an off-flavor — if exposed to sunlight,” she said.

When exposed to excessive darkness the leaves of the mutant, COG-free plants began to turn yellow, wrinkled, and thin -- signs the plants were dying.

"The damage is enormous because the trees have been infected by bacteria… You can see this tree, it is green, but the leaves are starting to turn yellow, which means it may be diseased."