α-Naphthalene acetic (α-NAA)

Introduction

The term auxin is generally used to describe both natural and synthetic chemical substances that stimulate elongation growth in coleoptiles and older stems. Auxins also affect other plant physiological processes, such as root initiation and lateral bud dormancy. The development of fruit may also depend on the presence of auxin.

Since auxins have a wide variety of effects on the growth of stems and plant organs, formative effects (morphogenesis) often depend on a number of factors including:

1. the developmental stage of the tissue or organ
2. the concentration of auxin
3. the type of auxin (natural or synthetic)
4. the involvement of other plant hormones
5. the use of intact versus excised tissue for experimentation

Auxins have been used commercially in agriculture for over 40 years.

The commercial uses include rooting of cuttings for plant propagation, promotion of flowering in pineapple, prevention of fruit and leaf drop, induction of parthenocarpic fruit (seedless fruit). Synthetic auxins are most effective because they are not decomposed systematically.

-Naphthalene acetic acide (α-NAA) is one of the most effective root-forming substances yet discovered. This type of auxin has been studied and proved for effects as an anti-abscission agent of fruit, in apple and pear trees. When properly applied, α-NAA inhibits budding, induces roots on cuttings, and prevents abscission layers from forming. It is frequently used to prevent budding on tubers, bulbs, corns and cuttings. After treatment with α-NAA, potatoes can be stored indefinitely without shrinkage and budding and flowering in fruit trees can be prevented until the danger of frost is over.

The same treatment is important for delaying flowering in such tropical species as mango and avocado. However, the most important commercial use for α-NAA is as an anti-abscission agent for apples and pears prevention of pre-harvest drop. α-NAA is available as a water soluble powder formulation as well as in bulk powder form.

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PACKAGING:

α-Napthalene Acetic Acid (α-NAA)

86-87-3

White to beige crystalline powder.

186.2

Less than 0.2%

Less than 3%

128-132°C

+99%
Possible trace impurities by HPLC
All less than 1%
B-Isomer
1,5,-Diacetic Acid
Di-1-Naphthylmethane

1 kg, 5 kgs, 50 kgs, & 100 kgs

Applications Data

It is a violation of Federal law to use this product in a manner inconsistent with its labeling. SHAKE WELL BEFORE USING!

Apples and Pears

Application directions consult State Agricultural Experiment Station or State Extension Service Authorities for correct timing of application on apples and pears.

Spray trees thoroughly, wetting all fruit stems and adjacent leaves. Applies to apples 7 to 14 days before harvest and to pears 6 to 7 days before harvest. Do not spray within 5 days of harvest. Do not make more than 2 applications and do not delay picking beyond optimum maturity.

α-NAA becomes effective within 3-4 days of application and prevents drop for three or four weeks. Separate sprays should be applied to early and late maturing varieties. Aerial applications of α-NAA should not be made under weather conditions favoring a minimal drift to achieve a uniform distribution of product.

Dilution for Spraying with Ground Equipment

Apples - Mix at the rate of 1.2 fl. oz. per 100 gallons of water (3 fl. oz. per 250 gallons) to prepare 20 ppm spray solution

Pears - Mix at the rate of 0.6 fl. oz. per 100 gallons of water (1½ fl. oz. per 250 gallons) to prepare 10 ppm spray solution.

Thoroughly cover trees with appropriate spray, using up to 465 gallons per acre on apples of the 20 ppm spray solution which provides a α-NAA equivalent of 35 grams per acre. Use up to 670 gallons of 10 ppm spray per acre for pears which provides 25 grams α-NAA per acre.

RENTRY STATEMENT

Do not apply this product in such a manner as to directly or through drift expose workers, or other persons. The area being treated must be vacated by unprotected persons. Do not enter treated areas without protective clothing until sprays have dried. Because certain states may require more restrictive reentry intervals for various crops treated with this product, consult your State Department of Agriculture for further information.

Written or oral warning must be given to workers who are expected to be in a treated area or an area about to be treated.

Oral warnings must be given if written warnings cannot be understood by workers and must be in a language they can understand. Give specific oral warnings which inform workers of areas or fields that my not be entered without specific protective clothing. The period of time field must be vacated, and appropriate actions to take in case of accidental exposure.

• Written warnings must include the following information: CAUTION.
• Area treated with a α-NAA on (date and time of application)
• Do not enter without full protective clothing until sprays have dried.
• In case of accidental exposure, immediately flush with eyes or skin with plenty of water. Get medical attention if irritation perists.

Holly

To delay leaf drop:

1. Use ¼ to ½ cupsful to 100 gallons of water (equals 33-66 ppm)
2. Dip holly soon after cutting; do not soak; drain off excess solution. Pack before holly dries with sufficient moisture to keep holly fresh until it reaches its destination. Ship immediately or store at 34 to 40°F. Keep solution as clean as possible. Renew dip with fresh solution as it is used up.
3. Do not keep solution longer than 3-4 days.

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