Table 1. SPECIFIC THINNING RECOMMENDATIONS.

Stage of fruit development

Cultivar

Petal fall to 3 mm

7 to 12 mm

15+ mm

McIntosh

Sevin

Sevin+2.5-7.5NAA or Sevin+50-75Accel

Sevin

Cortland

Sevin

Sevin

Sevin

Delicious (Promalin at bloom)

Sevin

Sevin (+75Accel if needed)

Sevin

Empire

Sevin

Sevin+7.5-10NAA or Sevin+50-75Accel

Sevin

Macoun

Sevin+5-7.5NAA

Sevin+5-7.5NAA

Sevin

Macoun (alternative)

Sevin

Sevin+75-100Accel

Sevin

Golden Delicoius

Sevin

Sevin+10-15NAA or Sevin+75-100 Accel

Sevin

Mutsu

Sevin

Sevin+5-7.5NAA

Sevin

Fuji

Sevin

Sevin+75-100Accel

Sevin

Gala

Sevin

Sevin+5-7.5NAA

Sevin

In all cases, Sevin is recommeded to be applied at 1 qt Sevin XLR per 100 gal., and NAA and Accel recommendations are in ppm.