| Post-Bloom Thinning |
ProTone® SG Plant Growth Regulator for Post-Bloom Thinning ProTone® SG Plant Growth Regulator Soluble Granule† provides post-bloom thinning and maximizes crop load management strategies for apples and pears. ProTone can also speed the fall defoliation in fruit, allowing for quicker dormancy in orchards. In addition, ProTone is approved for use on California apples as an organic fruitlet thinner. However, ProTone is not approved for use on pears in California. Apple and pear post-bloom thinning (excluding pears in California) Accelerates fall defoliation in fruit ProTone is NOP compliant and OMRI Listed for organic production ProTone Thinning on Bartlett Pears
1.00
0.75
0.50
0.25
0.00
ProTone 200 ppm
ProTone 300 ppm
Untreated
ProTone 100 ppm
ProTone applied at 10–12 mm to Bartlett pears. Application volume: 139 gal/A Location: Methow, Washington; Source: Valent
Untreated
ProTone Treated
Note the thinning of clusters down to singles.
ProTone Thinning on Apples
3.81 a
50
4
41.4a
40
2.96b
34b
3
30
1.75c
2
20
14.5c
1
10
0
0
Untreated
ProTone 200 ppm
ProTone 400 ppm
Untreated
ProTone 200 ppm
ProTone 400 ppm
ProTone reduced fruit set by 22% and 54%. *TCSA (cm2) = centimeters squared of trunk cross sectional area. Variety: Red Delicious; Source: Valent
ProTone had statistically lower fruit set, compared to untreated. Variety: Honeycrip; Source: Michigan State University
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