Apple flowers, 2016. Photo: Rob Crassweller, Penn State
We conducted this run at approximately 9:00 AM this morning. After much cloudy, cool weather in Central Pennsylvania, weather forecasters are calling for a period of warmer temperatures with cloudy conditions through Friday morning. The daily demand for carbohydrates is increasing across the state and especially for Berks County in the Southeast. Cloudy, warm weather results in higher respiration and greater carbohydrate demand leading to potentially greater tree response to chemical thinners. As mentioned previously, fruit size, chemical selection, drying conditions, spray volume, and other factors also contribute to tree response to thinners. We also are noticing some variability in the model and this is discussed in a follow-up article.