Pest Control and Fertilization for Vines

Pest Control

Grapevine breeding has now produced several new grape varieties that are resistant to powdery mildew (Oidium) and downy mildew (Peronospora). Some of these varieties are propagated specifically as table grapes due to their attractive fruits, but they can also be used for winemaking.

If, contrary to expectations, a slight fungal infestation is observed in these new varieties, it can generally be ignored, as it usually occurs late in the season and only affects appearance without causing lasting damage to the fruit or the plant.

Animal pests generally pose no significant threat. The vine grafted onto a resistant rootstock — and only such vines should be planted — will remain resistant to phylloxera throughout its life.

Fertilization

First of all: the grapevine near a house or in a garden usually does not require special fertilization. As long as it is not being crowded by other vigorously growing plants, its roots will extend far and gather nutrients. However, if signs of reduced growth appear, a moderate application of complete fertilizer is recommended — not only near the planting site.

Note: Mineral fertilization is often overdone. Excessive nitrogen fertilization promotes fungal diseases, delays wood maturation, and increases the risk of frost damage in winter.