1. Symptoms: it is more serious in humid, shaded, sticky soil and poor drainage environment. It will lead to a large number of abnormal fallen leaves and fruits, and in serious cases, the whole tree will die.
2. Control method: when the abnormal leaf fall of Kumquat is serious, the surface soil layer can be planed, the root system can be dug out to air the root, and then the root can be irrigated with 1000 times liquid of 58% metalaxyl manganese zinc wettable powder or 1000 times liquid of 50% dikesong soluble powder. After the tree tray is fully irrigated, it can be covered with fresh soil and replanted.
1. Symptoms: the larvae will eat the new leaves and buds, causing the leaves of Kumquat to be damaged or shed.
2. Control method: spray 50% fenitrothion 1000 times solution or 80% dichlorvos 1000 times solution in larval stage to control, or kill pupae outside branches.
1. Symptoms: it mainly damages the leaves, branches and fruits of kumquat, causing falling leaves and fruits. Yellow spots will appear on the back of the leaves of the injured plants, gradually expanding into grayish brown, ulcerative. The pathogen will spread with the wind and rain, and it is the most serious in the humid climate of 20-30 ℃.
2. Prevention and treatment method: 0.25kg copper sulfate, 0.5kg quicklime and 50kg water can be used as Bordeaux spray. It can also be treated with 600 times spray of zein.
