Authors: Van Driesche, R.G., J.H. LaForest, C.T. Bargeron, R.C. Reardon, and M. Herlihy. 2012. Forest Pest Insects in North America: a Photographic Guide. USDA Forest Service. Forest Health Technology Enterprise Team. Morgantown, WV. FHTET-2012-02.
Orientation to Pest
Camphor scale (also called camellia scale), Pseudaonidia duplex (Cockerell), is an invasive Asian scale found in the southern United States. The scale infests leaves, twigs and fruit of various plants, but especially the camphor tree (Cinnamomum camphora [L.] Sieb.). In Asia, it is a pest of tea plantations. In Louisiana, the scale has three generations per year and overwinters primarily as mated adult females.
Hosts Commonly Attacked
This scale feeds on over 200 different host plants in Louisiana alone, including the camphor-tree (C. camphora) and some species of citrus (Citrus). In Asia it is a pest of tea (Camellia sinensis [L.]Kuntze).
The U.S. distribution of this scale reaches from Florida and Georgia, west to Texas.
Biological Control Agents
In Taiwan in tea plantations, this scale is attacked by the parasitoid Neochrysocharis sp., which can cause 42-61% mortality (Shiao, 1978).
- Shiao, S. N. 1977. Bionomics of the camellia scale, Pseudaonidia duplex (Cockerell), in northern parts of Taiwan. I. Life history and mortality factors. Plant Protection Bulletin, Taiwan 19 (2): 65-77.
- Shiao, S. N. 1978. Bionomics of the camellia scale, Pseudaonidia duplex (Cockerell) (Homoptera: Diaspididae) in northern parts of Taiwan. II. Natural enemies. Plant Protection Bulletin, Taiwan 20 (3): 210-223.