Information

Agricultural entomology: Swiss chard cassida

Agricultural entomology: Swiss chard cassida

Classification and host plants

Class: Insects
Order: Beetles
Suborder: Polyphages
Family: Chrysomelids
Genus: Cassida
Species: C. vittata Villers

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

Host plants: Beetroot and other Chenopodiacee.

Identification and damage

The adults, about 5-6 mm long, have a typically oval body, light green in color with golden longitudinal bands on the elytra; the larvae are ovoid and have the body adorned with typical spiny formations.
The damage is accomplished by both stages that feed on the leaf parenchyma causing holes in it, resulting in the tearing of one of the two epidermis left intact. The damage caused by the congener Cassida nobilis is similar, which is more widespread in the northern regions.

Biological cycle

Cassida overwinters as an adult, takes to the beets in March-April, where it turns 2-3 generations a year.

Swiss chard cassida - Cassida victim Villers (photo www.gardensafari.net)

Fight

The fight against the Cassids is generally carried out only in the actual presence of infestation, limiting the interventions to the initial outbreaks; they are used, through foliar interventions possibly combined with the simultaneous control of other phytophages such as Altica.


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