Biology and harmfulness of Planococcus vovae (Nassonov) (Hemiptera: Pseudococcidae) in Belgrade area
Biologija i štetnost Planococcus vovae (Nassonov) (Hemiptera: Pseudococcidae) na području Beograda
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Author
Graora, Draga
Spasic, Radoslava
Ilic, Sladjana
Keywords
Planococcus vovaeHemiptera
Scales
Infestation
Hemiptera
štitaste vaši
infestacija
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Show full item recordAbstract
Planococcus vovae (Nassonov) (Hemiptera: Pseudococcidae) is an important pest on
plants of the family Cupressaceae. Its numerous populations have been present in recent
years on Juniperus spp. in Belgrade. Feeding by sap-sucking on all aboveground plant
organs, it causes growth stagnation, chlorosis, drying of needles and branches, and even
of entire plants under heavy infestation. Additionally, the scale excretes large quantities of
honeydew, on which sooty mold develops, reducing photosynthesis and causing faster
plant deterioration.
Throughout 2007 and 2008, P. vovae was recorded on Juniperus spp. in 12 localities in
Belgrade, and on Thuja sp. in a single locality. The pest was found to develop three generations
per year and overwinter on branches at the egg or second instar stages. The first generation
adults were observed at the end of May, the second generation at the beginning
of August, while the third generation was recorded at the beginning of October. Different
overwintering modes, and variable oviposition, embryonic and larval development periods
led to an overlapping of generations and continuous presence of all developmental
stages on plants.
In different localities the infestation of plants varied in abundance from a few individual
specimens to very large colonies. The highest infestation intensity was recorded in the
localities Bežanija, Doræol and Voždovac.
The predatory species Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) and
Nephus bipunctatus (Kugelann) (Coleoptera: Coccinelidae) were found in the scale colonies.
Regarding N. bipunctatus, this was its first record as a new species in the Serbian fauna. Planococcus vovae (Nassonov) (Hemiptera: Pseudococcidae) je značajna štetočina na
biljkama iz familije Cupressaceae. Poslednjih godina je na području Beograda prisutna u
brojnim populacijama na Juniperus spp. Hraneći se na svim nadzemnim delovima biljaka
dovodi do zastoja u porastu, hloroze i sušenja četina, sušenja grana, a pri jakoj infestaciji i celih
biljaka. Osim toga, vaš izlučuje velike količine medne rose na kojoj se razvijaju gljive čađavice
koje utiču na smanjenje fotosinteze i brže propadanje biljaka.
Na teritoriji Beograda P. vovae je tokom 2007. i 2008. godine utvrđena na Juniperus spp.
na 12 lokacija i na Thuja sp. na samo jednoj lokaciji. Ustanovljeno je da razvija tri generacije
godišnje i da prezimljava u stadijumu jajeta i larve drugog stupnja na granama biljaka. Imaga
prve generacije registrovana su krajem maja, druge generacije početkom avgusta, a treće
početkom oktobra. Različit način prezimljavanja, neujednačen period ovipozicije, kao i
embrionalnog i larvenog razvića, dovode do preklapanja generacija i stalnog prisustvo svih
razvojnih stadijuma na biljkama.
Na različitim lokacijama, naseljenost biljaka vašima kretala se od pojedinačnih jedinki do
veoma brojnih kolonija, pri čemu je najjači intenzitet napada zabeležen na lokacijama Bežanija,
Dorćol i Voždovac.
U kolonijama vaši registrovane su predatorske vrste Chrysoperla carnea (Stephens) (Neuroptera,
Chrysopidae) i Nephus bipunctatus (Kugelann) (Coleoptera, Coccinelidae), pri čemu
je N. bipunctatus nova vrsta za faunu Srbije.