Symptoms of rust disease of chrysanthemum (ghost ginger): chrysanthemum rust disease mainly affects the leaves, the back of the leaves form many brown blisters (summer spore piles), rupture dispersal of brown powder (summer spores); the late stage of the disease there are many small black-brown blisters (winter spore piles), rupture of the epidermis dispersal of black powder (winter spores). When the disease is severe, the leaves dry up early.

Control measures: (1) agricultural control: planting early maturity disease-resistant varieties; safflower harvested in a timely manner to deal with the remains of the disease to reduce the amount of bacteria in the next year; do not water too much, timely drainage after rain; increase the application of phosphorus, potash fertilizer and ash fertilizer, to enhance the resistance to disease.

(2) pharmaceutical prevention and control: ① seed treatment: before sowing with seed weight 0.2% of 25% triazolone wettable powder mix. ② Spraying: spray 25% triazolone wettable powder 1000 times liquid, or 40% DuPont Foxing emulsion 7000 times liquid, or 25% Dilithium (propiconazole) emulsion 3,000 times liquid, or 45% crystal sulfuric acid 400 times liquid and other agents in a timely manner at the beginning of the disease. If you add an appropriate amount of green Hen Tianbao (DCPTA) in the liquid, the effect is better.