Gastropoda, Geophila, Helicidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- In Portugal, very common in the coastal areas of Alentejo, Algarve, Estremadura up to the latitude of Coimbra. A very common species in Southern Europe, as well as in the Atlantic coastal region of France, where it can be harmful to asparagus, artichoke, bean, lucerne, beet, vine.
- In unfavourable periods (mid-winter and mid-summer), they are grouped together in very large numbers on different supports: agaves (Agave), Graminaceae, vine, fruit and forest trees.
The laying of eggs takes place from June to October. The eggs, numbering some sixty, are laid on stones or at a shallow depth in the soil.
The species is regularly harmful to vine in Portugal. In winter, vine snails congregate in dense colonies on the woody parts of the vinestocks. At the beginning of April during the start of vine growth they move to the green parts of the host, attacking young shoots, leaves and even the future bunches of grapes. This attack is short-lived (during the month following the emergence of vegetation) but it can be serious as it is very premature and target-concentrated.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.