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.