Ethephon is a broad-spectrum and efficient plant growth regulator, which is often used to ripen bananas and tomatoes in production and life. It is used for cotton ripening, which can make cotton peaches crack in advance and concentrate, and is widely used in cotton fields that are greedy for green, late-maturing and eager to sow subsequent crops. Ethephon is also used to ripen rice, tobacco and other crops.
Thibenuron is a common defoliant, which is mainly used for defoliating cotton. It has dual effects, high concentration can stimulate the production of ethylene, promote the activity of pectin and cellulase, and play the role of defoliation; At low concentration, it has the effect of cytokinin and can promote fruit setting. Cotton leaves generally dry up and gradually fall off when they are close to death. When cotton is harvested mechanically, these growing leaves are not conducive to mechanical operation, and dead leaf debris will stick to white cotton when cotton is harvested, which requires a lot of manual cleaning. Spraying thibenuron before harvesting can promote the separation of cotton petiole and stem as early as possible, and the leaves on cotton plants basically fall off during harvesting, which is beneficial to mechanical harvesting of cotton and improving cotton grade.
Diquat is a pyridine-based broad-spectrum and quick-acting herbicide for sterile crops, which can quickly dry up leaves. It is used to accelerate withering and defoliation of potatoes and other crops before harvest. Spraying when the crops are mature can make the remaining green stems and leaves dry quickly and harvest early.