Soft scale insects and mealybugs | | petroleum oil | 2.5% | Apply early in the spring at bud swell but before any leaf tissue is exposed. Apply in 250 to 300 gallons of water. Thorough coverage is essential for good results. Avoid use with captan or sulfur due to phytotoxicity. Also avoid use within 24 hours before or after freezing temperatures. Field data indicate only short-term benefits for reducing mealybug populations. Oil more effective against soft scale. |
Anthracnose, black rot, Phomopsis, powdery mildew | | *NYMiller Lime Sulfur | 1 gal/10 gal water | This spray is most likely to be beneficial on cultivars highly susceptible to anthracnose (e.g., Marquette, Reliance), where it can be important in blocks with a history of the disease, or in blocks where black rot and/or Phomopsis control is regularly problematic and conventional fungicides will not be used during the growing season. Otherwise, it is unlikely to be cost effective. THOROUGH coverage of the vines is essential for acceptable results. If practical, application to individual vines with a handgun or using some other system that minimizes loss of these expensive materials to non-grapevine surfaces (e.g., hooded-boom, recirculating sprayer such as the Lipco) is desirable. The low per-acre rate of *NYSulforix is unlikely to be effective unless loss to non-target surfaces is minimal. Use of more than 15 gal/A of *NYMiller Lime Sulfur is prohibitively expensive. For NYS users: note that *NYSulforix is only labeled for use against powdery mildew and Phomopsis and that*NYMiller Lime Sulfur is only labeled for control of Phomopsis, powdery mildew and anthracnose. |