Pruning young plum trees is essential for shaping a strong, productive structure. Focus on light pruning and gradual release of branches, with the main branches forming an angle of 65 to 80 degrees. Encourage the growth of large lateral branches to fill space quickly, which helps reduce tree vigor and promote early fruiting. Use techniques like support and bending to open up the main branches. Allow outer buds to grow and extend, while selecting flat or oblique lateral branches as secondary limbs. Plum trees have short shoots that produce more buds and grow upright, making them prone to dense growth. To maintain good air circulation and light penetration, remove excess shoots in early spring and thin out crowded ones during summer. Combine summer pruning with careful removal of long, competing branches. When cutting in summer, adjust the direction and angle of secondary shoots to help shape the tree effectively. If main branches are uneven or unclear, shorten strong branches, increase their angle, and keep weak branches shorter. For weaker branches, raise their angle, leave more buds, and allow moderate extension to balance the tree’s growth.
For mature fruit-bearing plum trees, it's important to manage the central leader and adjust the top growth to maintain tree size and stability. Thin out the upper branches by removing long, dense, and competing branches, while keeping some strong, middle-length shoots. Retain these shoots gradually to improve light exposure in the inner canopy and reduce excessive growth at the top. This promotes better fruit quality and the development of high-quality fruit clusters. Prune branches by removing old, weak, or unproductive ones, and replace them with new growth in a planned manner to keep the tree vigorous and balanced.
In late fruiting stages, older plum trees may develop new growth on the back of main branches, so timely summer pruning is necessary. Remove aging fruit clusters to encourage stronger growth. Eliminate all dense, weak, or thin branches. For trees that are growing well but producing poorly, check if over-pruning is the cause and adjust accordingly—avoid excessive thinning and ensure sufficient fruiting wood. For trees that bear too much fruit, leading to weakened growth and inconsistent yields, increase pruning slightly to restore tree vigor. Combine this with proper water management to enhance nutrient growth and bring the tree back to optimal health.
Virus Sampling Tube
There are mainly the following parts:
1. Sampling swab with disposable sterile plastic rod/rayon head
2. Sterile sampling tube containing 3ml of virus maintenance solution (gentamicin and amphotericin B are selected to better inhibit the fungus in the sample. Avoid the human sensitization reaction that may be caused by penicillin in the traditional sampling solution.)
In addition, there are additional parts such as a tongue depressor, a biosafety bag, etc.
Intended to use
1. It is used for monitoring and sampling of infectious pathogenic microorganisms by disease control departments and clinical departments.
It is suitable for sampling of influenza virus (common influenza, highly pathogenic avian influenza, H1N1 influenza virus, etc.), hand, foot and mouth virus and other types of viruses. It is also used for sampling of Mycoplasma, Chlamydia, Ureaplasma, etc.
2. It is used to transport nasopharyngeal swab samples or tissue samples from specific parts from the sampling site to the testing laboratory for PCR extraction and testing.
3. It is used to preserve nasopharyngeal swab samples or tissue samples from specific parts for necessary cell culture.
The virus sampling tubes are loaded with infectious substances, and some are even highly pathogenic substances. Therefore, the requirements for packaging containers are very strict, and three requirements must be met at the same time:
1. The safety of transportation.
Ensure that the sample does not leak during transportation. Sampling tubes that comply with WHO regulations and biosafety regulations.
2. The security of preservation.
Ensure that the sample does not leak during storage. Sampling tubes that comply with WHO regulations and biosafety regulations.
3. The validity of the sample.
Make sure that the sampling tube itself will not have a toxic effect on the sample.
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