Juniper scale crawlers hatching

Today I found female juniper scale. After flipping a couple covers I found they were all bursting with eggs and crawlers.

Juniper scale with test removed to show crawlers. Photo: SD Frank

Juniper scale with test removed to show crawlers. Photo: SD Frank

Juniper scale, Carulaspis juniper, attacks some of the most commonly used plants in ornamental landscapes including Juniper, Thuja, Chamaecyparis, Cupressus, Pinus, and others. There is one generation per year in which females fill up their armored cover with eggs in spring from which crawlers hatch and look for new feeding sites. Infestations can lead to foliage that becomes yellow or brown and generally less lustrous than normal. Large infestations can cause the tips of branches to die and the plant to become sparsely foliated.

Heavy juniper scale infestation. Photo: SD Frank

Heavy juniper scale infestation. Photo: SD Frank

Isolated infestations can be pruned off of plants. Natural enemies will often keep scale below damaging thresholds. However, in environments where natural enemies are not abundant control may be necessary. Horticultural oil will smother crawlers. Other chemicals such as dinotefuran (Safari), acetamiprid (TriStar), and pyroproxifen (Distance) and others can be used to manage infestations. More information on armored scale management can be found at: http://www.ces.ncsu.edu/depts/ent/notes/O&T/shrubs/note157/note157.html

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