2018 Crop Protection Guide for Tree Fruits in Washington

Nutrient Sprays

Friday, February 22, 2019

Ammonium thiosulfate

Enhancing the nitrogen status of blossom and young fruitlets can increase ovule longevity and cell division. Furthermore, sulfur deficiency in Washington orchards has become more common because of reduced use of sulfur-containing pesticides and fertilizers. Application of ammonium thiosulfate provides plant-available nitrogen and sulfur. Ammonium thiosulfate is corrosive; excessive application or improper timing may damage flower, fruit, and foliage. Consult the product label.


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