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Douglas Bailey, Professor, and Brian Whipker, Extension Horticulture Specialist - page 5 / 16

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7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)

Plug culture and flat culture differ in recommended rates. The rates shown in this table include both plug (lower rates) and flat culture (higher rates) recommendations. Apply ALL foliar sprays of plant growth regulators using 0.5 gallon per 100 square feet of bench area. Growers should refer to Horticulture Information Leaflet #528, Height Control of Greenhouse Crops, for application techniques and timing for growth regulators on floricultural crops. Contact floricultural specialists at NC State University for further application information.

2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)

400 to 3,000 ppm spray (0.43 to 3.25 fl oz/gal)

20 to 30 ppm spray (5.12 to 7.68 fl oz/gal)

25 to 132 ppm spray (12.1 to 64 fl oz/gal)

0.25 to 0.50 mg a.i. drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

Drench volumes and mg a.i. vary with pot size. Contact floricultural specialists at NC State University.

5 to 25 ppm spray (1.3 to 6.4 fl oz/gal)

See Ageratum.

23.66 mg a.i. drench for a 6 inch pot (6.4 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

Drench volumes and mg a.i. vary with pot size. Contact floricultural specialists at NC State University.

2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

See Ageratum.

26 ppm spray (12.6 fl oz/gal)

Contact floricultural specialists at NC State University.

1,500 to 2,500 ppm spray (0.24 to 0.39 oz/gal)

Apply solution when new growth from final pinch is 1 to 2 inches long.

1,000 to 4,000 ppm spray (1.08 to 4.34 fl oz/gal)

Optimum rates are generally between 1,000 and 2,000 ppm. Two to six multiple sprays may be needed. Apply first application when new growth is approximately 2 inches long.

Use a 3 to 5% solution (8.6 to 14 fl oz/gal) solution in greenhouses; use 5 to 7% (14 to 20 fl oz/gal) outdoors. Apply as a foliar spray.

Efficacy is related to relative humidity and temperature. Spray a few plants to check activity prior treating the entire crop; effects should be visible in about 1 hour. Be certain chemical covers shoot tip. Ineffective if microscopic flower buds are present.

2,471 to 4,943 ppm spray (8 to 16 fl oz/gal)

100 to 200 ppm spray (3.2 to 6.4 fl oz/gal)

To control plant height and promote flower bud initiation, apply after final shaping, when new growth is 1.5 to 2 inches long. To reduce bypass shoot development, apply after bud set, when bypass shoots are barely visible.

0.59 to 1.77 mg a.i. drench for a 6 inch pot (0.16 to 0.48 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

Drench volumes and mg a.i. vary with pot size. Contact floricultural specialists at NC State University.

10 to 15 ppm spray (2.56 to 3.84 fl oz/gal)

Apply at 1.5 quarts per 100 square feet of bench area. Contact floricultural specialists at NC State University for further application information.

250 to 1,000 ppm spray (1 to 4 fl oz/gal)

GibGro 4LS has 24(c) registration for distribution and greenhouse use only within North Carolina. Spray timing, concentration, and number of applications varies with cultivar as well as intended degree of cold substitution. Consult the label for exact recommendations.

100 to 750 ppm spray (0.4 to 3 fl oz/gal)

GibGro 4LS has 24(c) registration for distribution and greenhouse use only within North Carolina. Apply two to three sprays at 2 to 3 weeks intervals after each pinch.

To control plant height

Sumagic

For partial or full substitution of cold

GibGro

To prevent flower bud initiation during vegetative growth

GibGro

To control plant height

Sumagic

To control plant height

Bonzi

B-Nine

Alternanthera (Joseph's-Coat)

Alyssum

Amaryllis

To increase lateral branching

Florel

To control plant height, reduce bypass shoot elongation, and promote flower bud initiation

Bonzi

Table 1. Plant growth regulators labeled for use on floricultural crops in a greenhouse.

Bonzi

Aster

Azalea

Precautions & Remarks

Cycocel

Cycocel

To promote lateral shoot growth on vegetative plants

Off-Shoot-O

Crop Ageratum

Sumagic

To control plant height

A-Rest

To control plant height

B-Nine

Purpose To control plant height

To control plant height

To promote flower initiation

A-Rest B-Nine

Product A-Rest

Application Method & Rate

5

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