Figure 4.

Preharvest fruit drop (%) from 2000 to 2019. (A) The fruit drop profile of five citrus groups including navel oranges, early-mid-season non-Valencia oranges, Valencia oranges, white, and red seedless grapefruits. The graph is based on the available information of citrus production reports in Florida from the USDA’s National Agricultural Statistics Service (NASS, 2019) available at https://www.nass.usda.gov/StatisticsbyState/Florida/Publications/Citrus/Citrus_Forecast/history.php. The dramatic increase in fruit drop during the 2004–2005 season was mainly due to the 2004 Atlantic hurricane season (Hurricane Charley, Hurricane Frances, Hurricane Ivan, and Hurricane Jeanne), whereas the high fruit drop during 2017–2018 season was due to the high winds of Hurricane Irma in September 2017. (B–F) Simple linear regression between crop season and preharvest fruit drop (%) of five citrus groups including navel oranges, early-mid-season non-Valencia oranges, Valencia oranges, white seedless grapefruits, and red seedless grapefruits, respectively. Dots present data on citrus production in Florida from the USDA’s NASS. The fitted regression line is presented as a solid line. The 95% confidence curve for the estimated linear regression is light-blue-shaded and edged by dotted lines. Regression equation, R², R²_adj, and p-values were also obtained and are presented in the lower right corner of the graph.