Citrus scab is a common disease on citrus trees, with its occurrence closely related to overcast and rainy weather as well as high humidity. Once the disease develops, it causes leaf spotting and premature defoliation, thereby reducing yield. The key to controlling citrus scab lies in early prevention and the selection of appropriate fungicides—Lanbaichuan 77% Copper Hydroxide Wettable Powder is registered for use against citrus scab on citrus trees and can be applied by foliar spraying according to the label instructions.
Citrus scab typically first shows symptoms on leaves, with lesions spreading from the lower to the upper parts of the tree and increasing in number over time. In the early stage, the symptoms are inconspicuous; by the time the lesions coalesce into patches and spraying is initiated, it is often too late. Therefore, frequent field scouting is essential—apply the first spray as soon as lesions are observed on citrus trees to suppress the pathogen at its source.
Lan Baichuan 77% Copper Hydroxide Wettable Powder, registration No. PD20101625 (subject to the actual label). Primarily controls citrus scab. Dilute at 500–600× with water and spray; apply at the early stage of disease development, and a supplementary application may be made at intervals of 7–10 days depending on disease severity. Ensure sufficient water volume and thoroughly wet the affected plant parts.
Copper hydroxide wettable powder and similar products, when used consecutively over an extended period, can lead to the development of pathogen resistance. It is recommended to rotate with fungicides of different modes of action. For specific dosage and water volume, always refer to the product label. As varieties and weather conditions vary by region, do not directly copy application regimens from other areas.
