Poplar, arbor. Trunk usually ends straight; Bark is smooth or longitudinally dehiscent, usually grayish white. There are terminal buds (Populus euphratica has no buds), and the bud scales are mostly sticky. Branches are long (including sprouted branches) and short, cylindrical or ridged. Leaves alternate, mostly ovoid, ovoid-lanceolate or triangular-ovoid, and often have different shapes and toothed edges on different branches (such as long branches, short branches and sprouting branches); Petiole long, lateral flat or cylindrical.

Willow is a general term for plants. There are many kinds of willows, which are easy to cross. Hybrid has strong growth potential and adaptability, and it is easy to reproduce asexually. You can choose from natural or artificial hybrid populations and obtain excellent clonal varieties through asexual propagation. In addition, a large number of high-quality seedlings can be obtained quickly by plant tissue culture. Breeding based on garden ornamental should focus on improving its branches, leaves and tree shape, and improving its anti-pollution ability and pruning and shaping ability.

The harm of flying flocs.

The harm of catkin is mainly manifested in affecting air quality and causing certain harm to human health. Such as skin allergy, small red rash, peeling, red itching, chronic bronchitis and other respiratory diseases. Especially for people with allergic constitution, contact with flying flocs can lead to skin allergy, rash and itching, and in severe cases, it can stimulate and aggravate respiratory diseases such as asthma and chronic bronchitis. Flying flocs can also carry and spread bacteria, causing inflammation of the nose and eyes.

Flying catkins are also harmful to public safety, traffic safety and public facilities. For example, flying flocs may block the radiator of the car water tank, making the car easy to boil and stall, blocking the sight of pedestrians and vehicles, thus affecting traffic safety.