Amid-Thin® W Introduction

Since 1953, scientists have known that the active ingredients Naphthaleneacetic Acid (NAA), and Naphthaleneacetimide (NAD) will thin fruit sets in apples and pears, leaving the healthiest fruit to grow to their optimum size and shape.

AMVAC Chemical Corporation produces and sells NAA products worldwide- including Amid-Thin®, K-Salt™ Fruit Fix™ 200 and K-Salt™ Fruit Fix™ 800 thinning and stop-drop sprays, and Tre-Hold® sprout and limb inhibitor.

Amid-Thin® Tips for Apples:

Use on early varieties of apples, i.e. those that ripen before McIntosh, or "round" fruit such as Fuji, Rome, Gala, Jonagold, Braeburn. Amid-Thin® may be used on Red Delicious in areas other than the Pacific Northwest.

Early summer varieties must be sprayed no later than petal fall to avoid insufficient thinning or the development of pygmy fruit.

Thin between 50-80% petal fall. Warmer temperatures mean less petal fall is necessary. Do not apply Amid-Thin® on Red Delicious after petal fall. Do not use Amid-Thin® on Red Delicious varieties in the Pacific Northwest, as "pygmy" fruit may develop. Use Fruitone on Red Delicious in the Pacific Northwest

Delay application until temperature forecasts are for +50 to 80 degrees F, and fruits are 2 to 4 mm in size. If the King blossom is lost due to frost, wait until the largest fruit is 8 mm.

Amid-Thin® works best under slow drying conditions

Trees low in vigor, under stress, or which have been subjected to freeze are more easily thinned

Direct the spray towards the top 80% of the tree. This provides better coverage and protects against predators

Jonagold, Golden Delicious, and Fuji are harder to thin. Braeburn, Red Delicious, and Granny Smith are easier.

Amid-Thin® Tip for Pears:

Sensitivity to Amid-Thin® varies considerably among cultivars. Pears are generally more sensitive to pears than apples. Use caution with Anjou and Seckel varieties, since they are very sensitive to Amid-Thin®

Apply within 5 to 7 days after petal fall at the rate of 10-50 ppm, or 15 to 20 days after full bloom. A surfactant may be used with Amid-Thin® at the rate of 10-15 ppm.

Use up to 400 gallons per acre (2 lbs product per acre)

Amid-Thin® may cause flattening of leaves and at high rates may overthin. Bosc pear may be completely defruited with Amid-Thin® at 25 ppm.

Rates: 4 ounces = 25 ppm per 100 gal

Additional Amid-Thin® W Information: