What is the current tomato "flower face"?

At present, in Dawang Town, Guangrao City, Shandong Province, tomatoes are commonly grown either in greenhouses or in open fields. However, a common issue is the appearance of yellow patches on the shoulders of the fruits, with some spots extending toward the top and others alternating with red patches. Additionally, some fruits show green or brown stripes on their surface, along with brown veins inside. These visual abnormalities significantly reduce the commercial value of the tomatoes and negatively impact farmers' income. The causes behind these symptoms include: 1. Yellow, green, brown, and black spots on the fruit can be caused by viral infections, which typically occur during May to June when temperatures are high. 2. Excessive use of nitrogen fertilizers leads to vigorous plant growth, increasing chlorophyll levels while inhibiting lycopene formation, resulting in yellow spots on the fruit. 3. Continuous cropping in some vegetable plots has led to root rot, wilt disease, and physiological plant death. This weakens nutrient uptake, reducing lycopene production and causing yellow patches in mature fruits. 4. This year, excessive rainfall and high humidity have reduced transpiration in plants, limiting water absorption and thus decreasing the uptake of essential nutrients like potassium, calcium, iron, copper, and boron. This imbalance increases chlorophyll levels, slows down lycopene formation, and causes yellow spots. 5. Brown stripes on the fruit surface and brown lines inside may be due to virus infections, but more often result from low light intensity, high humidity, overuse of nitrogen, and potassium deficiency. Even if potassium is present in the soil, ammonium ion accumulation can inhibit its uptake, leading to nutrient imbalances and brown necrotic spots on the fruit. 6. In some areas, leaf damage and excessive pruning expose the fruit to direct sunlight, raising temperatures and reducing lycopene production, which turns the peel yellow. 7. Deficiencies in elements such as zinc, calcium, iron, molybdenum, and boron can also lead to similar issues. To prevent these problems, the following measures are recommended: 1. During summer, ensure proper ventilation and irrigation in greenhouses to control diseases like fusarium wilt and root rot. Avoid overcropping, plant seedlings at the right time, limit fertilizer use, and ensure deep planting to promote strong root development. 2. Monitor aphid populations and maintain adequate watering to avoid drought and heat stress. Apply preventive treatments early to avoid viral infections. 3. Reduce nitrogen fertilizer application and increase the frequency of topdressing. Use balanced fertilizers rich in potassium, calcium, iron, magnesium, and zinc to support healthy fruit development. 4. Deep plow the soil to a depth of at least 30 cm. If mechanical tools are unavailable, apply soil conditioners before planting or during growth to improve soil structure in the 30–50 cm layer. This enhances root development, nutrient absorption, and water retention. 5. During rainy periods, apply foliar fertilizers every 5–10 days with a concentration of about 0.3% to compensate for poor root nutrient uptake. 6. Spray plant growth regulators every 10–20 days during rainy weather to boost photosynthesis and nutrient production. 7. Control leaf diseases promptly and maintain sufficient foliage to protect the fruit from sun exposure.

Magnetic Bead Acid Nucleic Extraction Kit

In order to implement the requirements for the prevention and control of the new coronavirus pneumonia epidemic, all parts of the country are actively cooperating in the normalization of epidemic prevention and control. Each city has arranged multiple nucleic acid testing sampling points, and requires a negative nucleic acid test result within a few days. Public places are accessible, and the importance of nucleic acid testing for epidemic prevention and control is self-evident.
As of now, there are 13,000 medical and health institutions in the country that can carry out nucleic acid testing, and 153,000 professional and technical personnel are engaged in nucleic acid testing technology. The nucleic acid testing capacity has reached 57 million tubes per day. In order to help the prevention and control of the new crown epidemic, Yisheng Biology quickly launched the nucleic acid extraction reagent + 96-channel automatic nucleic acid extraction instrument. It only takes about 10 minutes to extract 96 nucleic acid samples at one time, and extract nucleic acid in a faster and more accurate way. Work becomes more efficient.
Magnetic Bead Swab Sample Viral DNA/RNA Extraction Kit can be used to isolate and purify high-quality viral DNA/RNA from various swabs and virus culture supernatants. By using magnetic beads with unique separation function and carefully optimized buffer system to efficiently capture the released nucleic acid, the extracted nucleic acid has high yield and good quality, which is suitable for various downstream application experiments, such as RT-qPCR, qPCR and other experiments.

Magnetic Bead Acid Nucleic Extraction Kit,Viral Dna Extraction Kit,Viral Rna Extraction Kit,Rapid Viral Rna Extraction Kit

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