Apple Carbohydrate Thinning Model-Updates-(May 02 – 05)

Unlike last week, weather forecast predicts conditions that will likely lead to carbohydrate surplus and subsequently, less thinning efficiency this week (May 01-05). As shown in the images below, the carbohydrate model predicts accumulation of up to 35g/day carbohydrate this Friday. This, in turn, will necessitate a 30% increase in the rate of chemical thinners that will be applied tomorrow, Thursday or Friday. I believe we are still within the good thinning window in terms of fruit size, but this week might be the last chance for (6-BA + Carbaryl), or (NAA + Carbaryl) sprays to show an effect.
The following is the carbohydrate model for Winchester and Central Virginia.

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