Per page 10 of the Manzate Pro-Stick Fungicide Product Label linked Here and on our product page:
Pome Fruit Use rate- 3.0 lbs per acre in a minimum of 50 gallons of water per acre.
Extended Application Schedule or for use in Tank Mixtures: For implementation of the IPM programs, applications based on tree-row volume, or for use as a resistance management tool: begin applications at 1/4 to 1/2 inch green tip and continue applications on a 7 to 10 day schedule through the second cover spray. Use either the "Pre Bloom/Bloom" or "Extended Application" schedule. Do not combine or integrate the two treatment schedules.
This product is not designed for small area applications. You would need to get a scale to weigh out the correct ratio. To help with some of the math, it would be roughly 1/2 lb of product to every 7-8k sq/ft you apply it to. The water volume is merely the carrier to get it evenly distributed over the surfaces, so the ratio of water can vary from person to person and their needs.
Manzate Pro - Stick Fungicide is labeled for certain fruits, but it is not labeled for use on citrus trees. Please be sure to review the product label for more information and complete application instructions. If you are able to provide more information on the specific diseases you are targeting, we would be more than happy to make a proper recommendation. If you are unsure of which fungi you are treating, we would suggest reaching out to your local cooperative extension office to speak with your Master Gardener for help with positive identifications of the diseases.