4-CPA PCPA 4-Chlorophenoxyacetic Acid

Basic Info

4-CPA is a phenoxy plant growth regulator with auxin activity. It is absorbed by the roots, stems, leaves, flowers and fruits of plants.
Its biological activity lasts for a long time. Its physiological effects are similar to endogenous auxins, stimulating cell division and tissue differentiation, stimulating ovary expansion, inducing parthenocarpy, forming seedless fruits, promoting fruit setting and fruit expansion, preventing flowers and fruits from falling, promoting fruit development, early maturity, increasing yield, and improving quality.
It is mainly used to prevent flowers and fruits from falling in tomatoes, and can also be used to increase production and income of eggplant, pepper, grape, citrus, apple, rice, wheat and other crops.

Corp	Usage
Tomatoes	25-35mg/L.1~4 Inflorescence flowering period, spray or spot treatment. Treat as soon as the inflorescence blooms. Generally, high concentration is used to prevent the flowers from falling due to low temperature in spring, and low concentration is used to prevent the flowers from falling due to high temperature in summer.
Cucumbers	100mg/L. Dip flowers on the day of flowering or 1 day before and after
Melons	20mg/L. Spray flowers on the day of female flower opening
Jujube	20-30mg/L. Spray at the end of flowering period
Peaches	10-20mg/L. Spray once during flowering period
Apples	20-30mg/L. Spray once 30d and 15d before harvest
Citrus	5-10mg/L. Spray during physiological fruit drop period
Lychees	10-16mg/L. Start spraying at the end of flowering period, and use it again after 8~10d, focusing on the parts with flower spikes
Pineapples	10-16mg/L. Start spraying at the end of flowering period, and use it again after 8~10d, focusing on the parts with flower spikes

Corp	Usage
Wheat	60mg/L. Spray once during grain filling period
Rice	60mg/L. Spray once during grain filling period
Cotton	3-5mg/L. Spray 2~3 times during boll period, each time with more than 10d interval
Chinese Cabbage	20-40mg/L. Spray once 15d before harvest

Using too high a dosage or spraying the whole plant on vegetables will have adverse effects on the leaves. It cannot be used for seed tomatoes.
Spraying should be done in the morning or evening on sunny days. Avoid spraying on hot, sunny and rainy days to avoid pesticide damage.
The concentration of the liquid medicine should be strictly controlled. When preparing the medicine wave, the powder should be dissolved in hot water and then diluted with water.
The container for preparation should preferably be an enamel basin, glassware, etc. Do not use metal containers, especially rusty iron pots and iron basins, to avoid chemical reactions that reduce the efficacy of the medicine.