*Vydate (oxamyl)

Vydate is a carbamate insecticide-miticide-nematicide-plant growth regulator with contact and systemic activity. It is a contact, moderate-residual insecticide when applied as a foliar spray. It is labeled for use on apples to control spotted tentiform leafminer, European red mite, white apple leafhopper, rosy apple aphid, and twospotted spider mite.

Vydate, like Sevin, acts to promote chemical thinning, but it is not as harmful to predatory insects. Because of this quality we think Vydate will provide a slightly better IPM approach for thinning. When used at petalfall Vydate may provide some insecticidal benefits in addition to the thinning benefits. Vydate should be applied as a dilute spray between 5 and 30 days after full bloom (5 to 20 mm fruit diameter). Vydate may increase russet on cultivars prone to russet. When using Vydate as a thinner, do not combine with oil. Vydate is incompatible with alkaline materials.

When applied to the soil (preplant or postplant, nonbearing only), Vydate 10G acts as a nonfumigant nematicide. Vydate can be used as a preplant or postplant treatment for control of plant-parasitic nematodes on nonbearing trees only (i.e., trees that will not bear for at least 12 months). When used as a preplant treatment, Vydate is most effective if incorporated into the top 4 to 8 inches of soil and trees are planted within 24 hours. In postplant situations, the efficacy of surface-applied Vydate will improve if followed by rain or irrigation water. Foliar-applied oxamyl will be translocated within plants; however, foliar applications for nematode control are not recommended. See Part I for more information on apple thinning with Vydate.