Agricultural entomology: Metcalfa

Agricultural entomology: Metcalfa

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Classification and host plants

Class: Insects
Order: Rincoti
Suborder: Homoptera
Family: Flatidae
Genus: Metcalfa
Species: Metcalfa pruinosa Say

Bibliographic reference:
Phytopathology, agricultural entomology and applied biology” – M.Ferrari, E.Marcon, A.Menta; School edagricole - RCS Libri spa

Host plants: Vine, fig, fruit trees, ornamental, ornamental of landscape interest (maples, hornbeam, lime and others).

Identification and damage

Metcalfa is an insect, of American origin, first reported in Italy, Veneto and Friuli, in the late seventies. Ladulto, whose dimensions are about 6-8 mm, is grayish in color with the wings placed on the roof, very sloping on the body.
The youthful, white forms are protected by abundant waxy productions of cottony appearance and always white in color; these secretions are produced by the neanids through two evident siphons that perform a glandular function, placed in the terminal part of the abdomen.
The damage is determined by the trophic stings, but above all by the secretions and by the abundant honeydew produced, with which these insects smear the affected green organs.

Metcalfa - Metcalfa pruinosa Say (photo Francesco Sodi)

Metcalfa - Metcalfa pruinosa Say (photo Francesco Sodi)

Metcalfa - Metcalfa pruinosa Say (photo Sebastien Bedani)

Metcalfa - Metcalfa pruinosa Say (photo Sebastien Bedani)

Biological cycle

The insect is conserved, from one year to the next, in the egg stage in the woody ravines or among the rind of the host plants. In the spring, the eggs hatch, which is scalar, from May to mid-summer. Adults derived from this generation produce wintering eggs (from August onwards). Linsetto performs only one generation per year.


Metcalfa is generally controlled with other treatments performed against the phytophages of the vine.
The control of ornamental plants takes place between the end of May and June, on the juvenile stages, with vigorous washing to remove the waxy secretions, and with repeated and close treatments with Pyrethroids or Phosphorganics.
Among its natural enemies we can remember the Chrysopa carnea, some Coccinellidi and some Rincoti Antocoridi.
In 1987 a parasitoid and predator hymenoptera of the Driinidae family was introduced in Veneto.
It is the Neodryinus tiphlocybae; it is an entomophagus very active against the juvenile stages of Metcalfa, important for a future biological control of the phytophagous.

Video: Agricultural Entomology-2Nem Raj SundaUPACTETBHUICAR (August 2022).