In modern flower production, in order to ensure the quality of flowers, controlling the height of the plants has become a key technology. Controlling plant height with the help of chemical pesticides is one of the commonly used methods. These “pesticides” are called plant growth regulators. Commonly used plant growth regulators include B-nian (B9), A-Rest (A-rest), Cycocel (CCC chlormequat), and Bonzi (Bangji).
B-nian (B9): The scientific name is 2-2-glyceryl dicarboxaldehyde succinate, which is a water-soluble plant growth inhibitor. B9 is actually a brand name, which is a commonly used name in production. B9 is absorbed through the leaves and sprayed, and enters all parts of the plant after application. In modern greenhouse seedling production, the entire seedling stage is usually used several times. It should be noted that it can only be sprayed and not rooted.
It is worth noting that many flowers native to the tropics are not sensitive to B9. When the temperature is high, because it volatilizes quickly on the leaves, the efficacy will also be affected. Therefore, B9 It is more suitable in the northern region. In addition, B9 can only penetrate into the plant when the leaves are moist. It will be better to use B9 in the evening or when the ambient humidity is high. Moreover, it is best not to water by spraying within 18 hours after spraying to avoid the drugs on the leaves being washed away.
A-Rest: This chlormequat is very active and is suitable for many plants. It can be sprayed or rooted, but foliar spraying will be more active, easy to use, very effective after application, and easily absorbed by plants. The dosage is 5 to 25 mg/kg. But the market price will be slightly higher than similar products. It is better to spray this kind of pesticide in the morning to avoid being washed away by water during watering during the day.
Cycocel (CCC chlormequat): is the brand name of a fluoride-based chlormequat. It can be sprayed or rooted. Can be used on poinsettias, rhododendrons and most bedding flowers. During the seedling production process, the spraying concentration is relatively low, between 750 and 1000 mg/kg. It should be noted that the spray concentration of this type of chlormequat must be controlled well. Too high a concentration will cause plant poisoning. The symptoms are white spots or white halo spots on the young leaves within 3 to 5 days after spraying. This kind of chlormequat can also be mixed with B9. This method is often used on poinsettias. Its medicinal effect is greater than that used alone. However, it should be noted that the dosage of chlormequat must be determined first to ensure that the plants will not be poisoned, and then the dosage of B9 can be determined.
Bonzi: It is a triazole drug with wide applicability. Suitable for root irrigation. Because it is easier to be absorbed by the stems and enters the plant growth tips, where it has good activity. Large-flowered pansies, geraniums and periwinkles respond well to this, but pay attention to the dosage when using it on periwinkles, as the amount will cause black spots on the leaves. In addition, be careful when using it on Begonia, as it can easily damage the seedlings. This kind of pesticide has very high requirements on the concentration of the liquid, which must be precise, and the amount of spray on each plant must be consistent to avoid uneven growth in the future.