Citricola scale, Coccus pseudomagnoliarum (Kuwana) (Hemiptera: Coccidae) was
for the first time registered in Serbia in 2015 in the area of Belgrade on
Celtis occidentalis L. C. pseudomagnoliarum develops one generation annually
and overwinters as the second-instar nymph on host twigs. It forms numerous
colonies on infested plants, and symptoms of its feeding appear in the form
of drying leaves and twigs. In addition, large amounts of honeydew that this
scale secretes reduce photosynthesis and transpiration in plants, which
accelerates their decay. Citricola scale attracts many entomophagous insects
which are able to reduce pest population. The parasitoid wasps Coccophagus
lycimnia (Walker), Coccophagus piceae Erdos, Coccophagus scutellaris
(Dalman), Coccophagus shillongensis (Hayat and Singh) (Aphelinidae),
Cheiloneurus claviger Thomson and Metaphycus stanleyi Compere (Encyrtidae)
were reared. C. piceae and M. stanleyi are new species in the fauna of
Serbia. C. pseudomagnoliarum is a new host for the species M. stanleyi. The
predators Coccinella septempunctata L., Exochomus quadripustulatus (L.)
(Coccinellidae) and Chrysoperla carnea (Stephens) (Chrysopidae) were found
in scale colonies. The most efficient natural enemy of C. pseudomagnoliarum
nymphs was C. lycimnia, reducing scale populations by 11-26%.