Garden Talk

with Rebecca Jordi

Q: What is this white powdery stuff on the trunk of my citrus tree?

Leave a comment

Snow Scale

Snow Scale

A:   This pest is called citrus snow scale and believe it or not – it is an insect.  Citrus snow scale attaches to the trunk and sometimes when populations are extremely high, it can be found on leaves and other parts of the citrus tree.  The insect feeds on the plant juices diminishing the nutrients available to the tree.  The insect reproduces in large numbers to cover the trunk tissue where it resembles “snow.”  Armored scales are distinguishable from soft scales by the removable cover or ‘armor’. As crawlers, the females of snow scale insert their long mouthparts into suitable hosts and never move again. The immature males become immobile once they begin feeding and remain immobile until they emerge as winged adults.  In severe infestations, the bark of the trunk or limb can split, making the tree vulnerable to fungal disease. Citrus snow scale has a tendency to pile up on top of one another making chemical application difficult to reach the bottom layer.  Consider brushing the stems and branches with a soft toothbrush or larger soft brush first to remove some of the layers of the scale.  Then apply insecticidal soap or all season horticulture oil.  More than one application will be required.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s