Symptoms of Lethal Yellowing in
Cocunut Palms

Premature dropping of coconuts in various stages of development.
Darkening of the inflorescence. The flowers on a healthy inflorescence should be clear, yellowish to a light cream color. The flowers in lethal yellowing infected palms are dark brown to blackish.
The fronds start to turn yellow, begining with the older ones and advancing towards the younger ones near the center of the crown. Sometimes a younger frond will turn yellow. This is called a "flag frond" This is a significant sign of lethal yellowing, but is not always present.
The final stage is the death of the bud causing the youngest unfolded frond to collapse. Sometimes there may even be some green fronds left on the palm but the death of the bud is equivalent to the death of the palm. In a non-treated palm, this entire process may take as little as three to six months.

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