Core Insights - The peak viewing period for autumn leaves in Beijing has been delayed by about a week this year due to unfavorable weather conditions and plant diseases [5][6][9] - The best viewing period for red leaves in major parks like Fragrant Hills is from October 25 to November 15, with a red leaf rate of up to 80% for certain species [5][9] Weather Conditions - The combination of high temperatures and prolonged rainy weather in September and early October has negatively impacted the color change of leaves [6][8] - Ideal conditions for leaf color change include significant temperature drops and strong sunlight, which were lacking earlier in the season [6][8] Plant Health Issues - The health of the yellow-leaf trees has been compromised by diseases such as powdery mildew and wilt disease, affecting their ability to change color [8][9] - The wilt disease is caused by a soil-borne fungus that has persisted in the soil for years, complicating control efforts, especially in mountainous areas [9] Viewing Opportunities - Despite the delay in red leaf color change, other colorful foliage can be found in various parks, including ginkgo and purple leaf plants, providing diverse viewing options [11][12][14] - The Olympic Forest Park is highlighted for its vibrant ginkgo trees, which have already turned bright yellow, attracting many visitors [11][12]

Core Viewpoint - The article highlights the beauty of autumn in Beijing, emphasizing the vibrant colors of leaves and the enjoyment of visitors, while also addressing the negative impact of some tourists' behaviors on the environment and local wildlife [3][10][22]. Group 1: Autumn Experience - Beijing's autumn showcases a variety of colorful leaves, with parks like Tian Tan, Di Tan, and Xiang Shan displaying trees such as ginkgo, maple, and yellow horn [3][10]. - Visitors are actively engaging in activities like collecting leaves and fruits, creating unique decorations and art pieces [7][10]. Group 2: Environmental Concerns - Some tourists exhibit uncivilized behaviors, such as picking leaves from trees and climbing them for better photos, which can damage the trees [10][12]. - Reports indicate that certain trees, like persimmon trees, have been stripped of their fruits due to excessive picking, leading to broken branches and potential harm to the plants [12][22]. Group 3: Wildlife Impact - The collection of nuts and fruits by visitors can significantly affect local wildlife, as these are essential food sources for animals during winter [19][22]. - Unregulated feeding of wild animals by tourists poses health risks to the animals and can lead to pollution of water bodies [20][22].