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Updated: August 8, 2017
It looks like we will finally experience some warmer temperatures this week, especially on Wednesday and Thursday. In some locations the highs are expected to be in the low 90s. With those high temperatures predicted it would be a good idea to look at the model again on those days. The temperatures are finally conducive to the use of 6-BA products. In the chart below note that any positive 4-day average carbohydrate balance numbers indicate a need for a stronger thinner rate. Balances between 0 and -20 suggest using the standard rate of thinner that works best for your orchard and varieties.
For more information on the carbohydrate thinning model, visit Carbohydrate Thinning Model. For more details on factors that affect plant growth regulator performance and chemical thinner rates, visit Growth Regulators in Apple and Pear Production.
Table 1. Decision rules for using the output of the Carbohydrate model to adjust chemical thinning rate
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