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Agricultural entomology: Pulvinaria of the vine

Agricultural entomology: Pulvinaria of the vine



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Classification and host plants

Class: Insects
Order: Rincoti
Suborder: Homoptera
Family: Lecanids (Coccidia)
Genus: Pulvinaria
Species: E. vitis (L.)

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

Host plants: Vine, Maples, Hazel, Birch, Ash, Alder, Poplar and other ornamental and forest deciduous trees.

Identification and damage

Pulvinaria della Vite is a Coccid with a brownish scudetto body, ovoid and visible above all on the branches, on the branches and on the fruits.
The females produce an evident whitish, waxy and flaky ovisac, placed between the body and the attached organ; it follows that the shield, increasing in volume the bag, is raised in the front highlighting the sack of eggs under it.
The damage caused by these Coccidia is limited and essentially consists in the consequences of the trophic punctures carried out on the affected organs: in the rare cases of the appearance of colonies in massive form, there may be asphyxiation due to the layer of floccal colonies that surround the affected organs and for the release of honeydew.

Pulvinaria of the vine - Pulvinaria vitis (L.) (photo homepage.ntlworld.com/keith.balmer/BNHS/)

Female with Pulvinaria ovisac of the vine (photo homepage.ntlworld.com/keith.balmer/BNHS)

Biological cycle

Linsetto overwinters at the juvenile stage, on the branches or on the stem of the affected plants; complete development in the following spring.
The females produce the bag under the body; from these eggs, at the end of summer, the nymphs are born which are carried on the leaves and then, soon, on the twigs where they winter.
Pulvinaria vitis therefore performs one generation per year.

Fight

The chemical fight against Pulvinaria is not generally carried out due to the low relevance of the damage produced; in case of particular infestations, at the end of winter, a treatment based on DNOC or with activated white oils, or with polysulphides, can be done, wetting the trunks and branches well with the insecticide.


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