Huang Guan Pear is a newly developed variety bred by the Shijiazhuang Orchard Research Institute of the Hebei Academy of Agricultural and Forestry Sciences. Known for its early maturity, superior quality, high yield, and strong resistance to black spot disease, this pear has gained significant popularity in Hebei Province. Currently, it covers over 600,000 mu, making up more than 60% of the area dedicated to early and mid-season rough pears. However, in recent years, a serious disease known as "Potato Disease" — also referred to as "Chicken Paw Disease" or "Face Brown Spot Disease" — has been spreading rapidly among orchards. In some areas, the incidence rate reaches as high as 80%, posing a major challenge to the sustainable growth of the Huang Guan pear industry. Recently, a research project titled “Incidence and Integrated Prevention and Control of the Disease in Bagged Huang Guan Pears” led by the Institute of Fruit Tree Research at Shijiazhuang Agricultural and Forestry Sciences passed expert evaluation. The study focused on identifying the causes, epidemic factors, and integrated prevention methods for "Chicken Paw Disease." The application of these technologies has achieved a 95% control rate, significantly improving the health and market value of the fruit. Below is a detailed summary of the findings. **Symptoms and Causes** The disease typically appears during the near-mature stage of the fruit. Initially, brownish crescent-shaped or spot-like lesions appear near the lenticels. As the disease progresses, the lesions become larger, darker, and slightly sunken. Multiple lesions may occur simultaneously on different parts of the fruit, resulting in irregular dark brown spots or patches on the surface. Due to its resemblance to chicken scratching marks, farmers commonly refer to it as "Chicken Paw Disease." There are three main causes behind the formation of these lesions: calcium nutrient imbalance after bagging, excessive cracking of the fruit skin due to lack of protective stratum corneum, and high enzyme activity. The microenvironment inside the fruit bag differs from that of an unbagged fruit, leading to reduced calcium levels. This combination increases pericarp cracking and weakens the protective layer, triggering enzymatic reactions that cause browning. The formation of dense tissue (spots) serves as a protective mechanism of the fruit, but it does not lead to rot — only affecting the fruit's commercial value. Factors influencing the occurrence of the disease include bagging practices (type, color, transparency, and air permeability), nitrogen fertilizer application, fruit swelling rates, and environmental conditions such as climate and soil fertility. **Comprehensive Prevention and Control Measures** 1. **Fertilization**: Apply organic fertilizer in autumn, with 3–5 cubic meters per acre. Deep plowing is recommended for deep soils, while sandy, clayey, or alkaline soils should be trenched and fertilized. In severe cases, 100–200 grams of sodium tetraborate (borax) can be applied before flowering. During the fruit development stage, if the tree shows signs of weakness, apply nitrogen and phosphorus compound fertilizer early, ensuring the amount does not exceed 3 kg per tree. 2. **Winter Pruning and Thinning**: Ensure proper branch distribution to improve ventilation and light penetration within the canopy. Limit the number of fruits per acre to no more than 14,000, and keep the yield between 3,500–4,000 kg per acre. 3. **Calcium Spraying**: Before bagging, spray young fruits with calcium solutions like Ryan Calcium. Apply every 7–10 days, and up to two or three times if necessary. 4. **Bagging**: Use breathable and light-transmitting fruit bags (with about 10% light transmittance) or those coated with active materials. Bagging should take place from late May to early June. 5. **Watering**: Ensure adequate watering before flowering and during the frozen period. Watering in other periods should be based on the tree’s needs, avoiding flooding. Additionally, multiple cultivators have found that increasing soil temperature can enhance root activity and improve calcium absorption, which helps reduce disease incidence. These strategies collectively contribute to healthier orchards and higher-quality fruit production.

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