Chapter 23

Managing Nematodes in Vineyards

Monitoring Nematodes in the Vineyard

Prior to Establishment

Analysis of soil prior to planting the vineyard is advisable to determine the risk of nematode damage to new vines, and to decide if resistant rootstocks or a pre-plant soil treatment for nematodes is required. The best time to collect samples is in the fall when densities of many nematode species are at their highest.

Established Vineyards

Vineyards should be routinely monitored for nematodes. Sampling is best done during the period from late spring to mid-fall, when both the nematodes and the vine roots are more active. Populations are highest during this period and decline as the soil becomes colder. The best time to sample differs according to region, type of nematode, and variety of grapes. To get the greatest numbers and the most reliable indication of nematode populations, irrigate 3 days before sampling (or wait for 3 consecutive days of rain).

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