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hail (GB)
grêle (F)
grandine (I)
granizo (ES)
granizo (PO)

The in conjunction with thunderstorms occurring precipitation in the form of ice balls or lumps with a diameter of five to 50 millimeters (rarely even larger) arises in rapidly rising, moist air streams. The hailstones may vary according to the size leaves perforate or completely destroy and damage the shoot tips, which in extreme cases to complete Defoliation can lead. If large parts of the foliage and thus the assimilation area are affected, the growth and development of the vine will be affected, which may also affect the next harvest. A possible consequential damage through a defoliation is for example through sunburn caused grapes wilt,

Hail (> 0.5 cm), Graupel (<0.5 cm) and Griesel (<1 mm)

At the time of blossom Hail is particularly feared and leads to poor fertilization Verrieseln, In extreme cases, hail can completely destroy entire crops in a short time. During the ripening season even a light hail can damage the berries, especially red grapes are sensitive. These injuries promote the infestation bacteria, Insect pests and mushrooms, Under certain weather conditions, the one caused by a fungus white rot (Hail disease) occur. See also other negative weather conditions below drought. frost and wind, as well as in general to the topic circle under climate,

Hail damage from left to right: Grape to hail, severely damaged grape, kinked bones

Hailstones: Picture by Hilde Stockmann on Pixabay
Hail damage: SYNGENTA - Dr. Ing . Bernd Loskill, Syngenta Agro

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