PRB9™ 0-3-3 Application Rate and Timing in Table Grapes

Overview

• Plants in the field can be exposed to many kinds of abiotic stress such as heat, drought and salinity. These stresses can inhibit the normal growth and activity of a plant leading to decreases in yield and quality of a crop.
• Osmoregulants are substances produced by plants that assist plants in tolerating environmental stresses by stabilizing proteins and enzymes and ensuring proper water flow into the plant cells during stress events.
• PRB9 contains an osmolyte compound which increases resistance to abiotic stress and optimizes conditions for improved crop yield and plant performance.

Summary

• PRB9 increased yield, berry weight and reduced the percentage of small berries under all rates and application combinations.
• PRB9 applied twice, at pre-bloom and berry sizing, was the most effective treatment with the highest yields and the biggest shift in berry size from small to large size berries.
• Applications of PRB9 did appear to delay fruit development with a higher percentage of green fruit and lower Brix levels. However a slight delay in harvest time should alleviate those issues.
• The trial experienced heavy rain in August due to a rare hurricane event. The rain caused swelling in cracking in the developing fruit which led to a lot of rot and lower yields than is typical for the region