Prediction of Initial Set and the Thinning Response to Postbloom Chemical Thinners on Apples

Figures & data

FIGURE 2 Initial fruit growth of ‘McIntosh’ apples on open pollinated spurs and on spurs that were covered between pink and petal fall with insect barrier. Values represent means of all fruit on all spurs.

FIGURE 1 Initial fruit retention of ‘McIntosh’ apples on open pollinated spurs and spurs that were covered between pink and petal fall with insect barrier covering. Values represent means of all fruit on all spurs.

FIGURE 3 Relationship of fruit drop to fruit growth rates during the first week after NAA/carbaryl application on ‘Ace Delicious’ and ‘Gala’ apples.

FIGURE 4 Fruit retention of ‘McIntosh’ apples on untreated spurs and those treated with NAA at the 8- to 10-mm stage of fruit development. At least 95% of the fruit abscission had occurred on the last evaluation date, 23 and 21 days after NAA application in 1998 and 1999, respectively.

FIGURE 5 Growth of ‘McIntosh’ apple fruit treated with 8 mg·L⁻¹ NAA that abscised and untreated fruit that persisted to harvest. The statistical significance noted is for the growth rate between two adjacent times of measuring fruit.

FIGURE 6 Growth of ‘McIntosh’ apple fruit that were treated with 8 mg·L⁻¹ NAA and control fruit, both of which persisted to harvest.