Diseases and control measures of Gardenia jasminoides

Gardenia jasminoides yellowing

symptom

The leaves begin to turn green from the leaf edges and gradually spread to the central veins. In severe cases, the entire plant loses its green color and turns yellow, and finally the plant will dry up and die.

Prevention and treatment methods

Change to slightly acidic soil that is well-breathable, loose, fertile, and if conditions permit, use mountain mud; apply fertilizer in time, and apply 500 times diluted ferrous sulfate.

Gardenia jasminoides leaf spot

symptom

A fungal disease in which the pathogen invades from the tips or edges of the lower leaves. The infected leaves have light brown spots, and concentric rings can be seen upon closer inspection. In severe cases, large spots will form and the leaves will wither.

Prevention and treatment methods

Remove or cut off the diseased leaves promptly, and cover them with plastic bags to prevent spores from flying out and infecting other parts; spray 25% carbendazim wettable powder.

Sooty mold disease

symptom

It mainly harms the leaves, which have a layer of black coal powder on them, as if coal slag has been sprinkled on the leaves; it can also harm the branches and fruits. The disease is usually spread by aphids or scale insects.

Prevention and treatment methods

Reasonably dense planting, timely pruning of diseased branches, attention to ventilation and light, avoid stuffy and humid environment; when the disease is mild, just wipe it with clean water; it should be noted that plants with sooty mold disease are often also attacked by aphids. While treating the disease, it is important to kill insects.

Gardenia jasminoides leaf spot

symptom

It mainly harms the calyx, and small yellow-brown spots appear on the leaves and sepals, which are mostly clustered together and appear as star-shaped spots. When the disease becomes serious in the later stage, light gray mold will grow at the affected area.

Prevention and treatment methods

Shape and prune diseased branches, pay attention to hardening the seedlings, and enhance disease resistance; spray 0.5% boric acid solution on the leaves to resist bacteria invasion and prevent falling flowers and fruits; during the seedling stage, 1% Bordeaux liquid can be used for foliage spraying, spray once every half a month, and continue for 2-3 times.