First Paragraph: In recent years, California vineyardists have shown an increasing interest in the use of vigorous nematode-resistant grape rootstocks. In situations characterized by sandy soils of low fertility several varieties of these stocks have performed quite well (4, 7}. When planted in more fertile locations, however, they have often shown excessively vigorous vegetative growth, reduced flower fertility, and a resultant reduction in yields of fruit at harvest.
