2018 Crop Protection Guide for Tree Fruits in Washington

Bioregulator Sprays

Monday, March 25, 2019

Lime-sulfur/Oil Products

Lime sulfur (NovaSource Lime Sulfur, Rex Lime Sulfur) is registered for use as a bloom thinner either alone or in combination with horticultural oil products on Red Delicious, Golden Delicious, Gala, Fuji, Honeycrisp, Braeburn, Cameo, Cripps Pink (Pink Lady®), Granny Smith, Jonagold, or Pacific Rose. Oils tend to increase the penetration and efficacy of lime sulfur, requiring lower concentrations of lime sulfur when combined with oils to achieve desirable results. If using oil with lime sulfur, consult the oil label for specific use guidelines. A maximum of three applications can be made during bloom according to the needs of the individual block.

NovaSource Lime Sulfur and Rex Lime Sulfur are labeled under 24C Special Local Needs provisions in Washington. The registrant of Rex Lime Sulfur, Pest Management Northwest, Inc., requires that users must sign a special conditions and use waiver prior to obtaining this product. Be sure to follow all label instructions carefully. Lime sulfur and oil products are currently approved by the USDA and Washington State Department of Agriculture for bloom thinning in Washington organic apple orchards.

Tree Fruit Research & Extension Center, 1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181, Contact Us