The New Pestalotiopsis leaf disease began in 2016 in Indonesia, Malaysia, India, Sri Lanka, and Thailand. The disease had damaged 388,800 hectares of rubber trees in Indonesia, 122,530 hectares in Thailand, and 10,000 hectares in Malaysia. According to the Association of Natural Rubber Producing Countries (ANRPC), in 2019, they forecasted that the disease made the rubber output dropped 329,000 tons in Indonesia and 121,000 tons in Thailand. Thailand has reported an outbreak in September 2019 until now in 9 provinces of rubber plantations, concluding Narathiwat, Yala, Trang, Phang Nga, Pattani, Surat Thani, Songkhla, Krabi, and Satun. The disease severely affected rubber plantations by reducing productivity until there is no productivity. It caused dried bark and bough. At first, the spread of the disease might be found in plateau areas, high humidity places in the old leaves state. The areas, which raining interspersed with drought will expedite the spread as well as the severity of the disease. All of the rubber tree varieties were weak toward the Pestalotiopsis leaf disease. Furthermore, the disease can spread through the wind, raining, planting material transfer, and immature rubber trees. Moreover, one of the risk factors was the weak rubber tree caused by the lack of fertilizer. Because of the drop in rubber prices, smallholdings did not have enough money to fertilize the rubber trees. According to the Rubber Authority of Thailand (RAOT), the disease also spread through unwanted flora or other plants (both in Monocotyledon and Dicotyledon) in rubber plantations.