Abstract
Tests with DBCP as a soil treatment to control nematodes on estabished grapevines were generally unsatisfactory in terms of increased yields when applications were made through chisels on machine-driven equipment.
Recent tests with emulsifiable formulations metered into irrigation water have given statistically significant increases in production in 6 out of 7 tests—as much as 50%-100% more from treated vines than from untreated vines in two Tokay vineyards near Lodi, California. In most cases yield responses were not obtained the same year as the application. One additional advantage from use of this material in the Lodi area has been an apparent protection afforded treated vines against damage from high temperatures, especially following sulfur dusting.
A carryover of beneficial effects for three years was obtained in a Thompson Seedless vineyard in Kern County. Similar carryover has been recorded in the two Tokay vineyards treated near Lodi, and visual growth differences this year indicate that similar improvements may be expected for the third year. This carryover may be related directly to nematode control, which, at least in the Tokay tests, shows marked reductions of X. index the second and third years after treatment. This is in contrast with root-knot nematode control, which usually is effective for one season or less.
- Copyright 1964 by the American Society for Enology and Viticulture
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