What is the current tomato "flower face"?

At present, in Dawang Town, Guangrao City, Shandong Province, tomatoes are either grown in greenhouses or in open fields. However, a common issue has emerged: the fruits develop yellow patches on their shoulders, sometimes extending to the top of the fruit. In some cases, yellow and red spots alternate, while others show green or brown streaks on the surface, along with brown veins inside the fruit. These abnormalities significantly reduce the market value of the produce and negatively impact farmers' income. The causes behind this problem include: 1. Yellow, green, brown, and black spots on the fruit can be caused by viral infections. These diseases typically occur during May and June when temperatures rise. 2. Many farmers over-apply nitrogen fertilizers, leading to excessive vegetative growth. This increases chlorophyll levels, which hinders lycopene formation, resulting in yellow spots on the tomatoes. 3. Severe crop rotation leads to root rot, wilt disease, and plant death due to long-term planting. As the fruit ripens, nutrient deficiencies cause reduced lycopene production, leading to yellow patches. 4. This year, heavy rainfall and high humidity have affected transpiration, reducing water absorption by the roots. Consequently, essential nutrients like potassium, calcium, iron, copper, and boron are not adequately transported to the leaves, further increasing chlorophyll levels and blocking lycopene formation, causing yellow spots. 5. Brown stripes on the fruit and within it are often linked to environmental factors such as weak light, high humidity, excessive nitrogen, and potassium deficiency. Despite sufficient potassium in the soil, ammonium ions may block its uptake, causing physiological potassium deficiency. This leads to poor nutrient transport and brown necrotic areas on the fruit. 6. Some tomato plants suffer from leaf damage or excessive pruning, leaving the fruit exposed to direct sunlight. High temperatures can inhibit lycopene formation, causing the skin to turn yellow. 7. A lack of trace elements like zinc, calcium, iron, molybdenum, and boron in the soil can also lead to blossom-end rot-like symptoms. To prevent these issues, several measures can be taken: 1. During summer, ensure proper ventilation in greenhouses and manage irrigation to control diseases like fusarium wilt and root rot. Avoid long-term cropping, early planting, excessive fertilizer use, and shallow planting. Instead, delay planting, apply fertilizers appropriately, and till deeply to promote healthy root development. 2. Monitor aphid populations and water regularly to avoid drought and extreme heat. Apply preventive treatments to guard against viral infections. 3. Reduce nitrogen fertilizer use and increase the frequency of top-dressing. Focus on adding potassium, calcium, iron, magnesium, and zinc to improve fruit quality. 4. Deep plowing to a depth of at least 30 cm is ideal. If not possible, apply soil conditioners before planting or during growth to improve soil structure in the top 30–50 cm. This enhances root growth, nutrient uptake, and water retention, reducing stress on the plants. 5. During rainy periods, root absorption of essential nutrients is limited. Therefore, foliar sprays of potassium, boron, calcium, magnesium, iron, and zinc (at 0.3% concentration) every 5–10 days can help address deficiencies. 6. Spray plant growth regulators every 10–20 days during rainy weather to boost photosynthesis and nutrient production. 7. Control foliar diseases and maintain adequate leaf coverage by leaving more branches on the upper part of the plant. By implementing these strategies, farmers can effectively reduce the occurrence of yellow patches and improve the overall quality and marketability of their tomatoes.

Test Kits

Diagnostic reagents can be divided into two categories: in vivo diagnostic reagents and in vitro diagnostic reagents. It is mostly a reagent for detection by the reaction between antigen and antibody.
A: Classification of in vitro diagnostic reagents:
1. In vitro biodiagnostic reagents managed as drugs include:
1. Blood type and tissue type reagents;
2. Microbial antigen, antibody and nucleic acid detection reagents;
3. Tumor marker reagents;
4. Immunohistochemistry and human tissue cell reagents;
5. Human genetic testing reagents;
6. Biochips;
7. Allergy diagnostic reagents.

2. In vitro reagents managed as medical devices include:
1. Clinical basic test reagents;
2. Clinical chemistry reagents;
3. Blood gas and electrolyte determination reagents;
4. Vitamin determination reagents;
5. Cell histochemical stains;
6. Autoimmune diagnostic reagents;
7. Microbiological test reagents.
B: According to medical test items, clinical diagnostic reagents can be roughly divided into clinical chemical test reagents, immunology and
Serological testing reagents, hematological and cytogenetic testing reagents, microbiological testing reagents, body fluid excretion
Detection reagents, genetic diagnosis reagents, etc. Among them, the market share of clinical chemistry
The largest, close to 34%; followed by the immunology market, accounting for about 29%. Novel immunodiagnostic reagents and genetic diagnostic tests
The reagent was developed in the late 1980s, and it is the most common diagnostic reagent for all current diagnostic reagents, regardless of technology or market.
The fastest growing product.

Urine Rapid Test Kit,Rapid Test Kit 6-Panel,Toxoplasma rapid test kits,Fecal Occult Blood Test

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