1. Symptoms: its adults and larvae will suck juice from the leaves of Commelina grandiflora to produce yellow spots. Most of the scale insects propagate in the poor ventilation environment, and do great harm to plants.
2. Prevention and control method: when maintaining the plant, it is necessary to ventilate frequently. Once the scale insects are found on the leaves, they need to be treated in time by spraying chlorphenazine on the diseased plants or killing the milk oil quickly. Spray once every 7 days, 2-3 times continuously.
1. Symptoms: spider mite. It mainly damages the leaves of Commelina communis, destroys the chloroplasts in the leaves, makes them lose color and grow spots.
2. Control method: if the insect is found, spray the leaves immediately. We can use acarid, Omethoate and other drugs to control this pest. Spray once a week, 2-3 times in a row can cure.
1. Symptom: the pathogen first invades from the tip of petal. The petals will soften and fade after the disease. Finally, the petals turn brown and rot, causing the flowers to fall off.
2. Prevention and control methods: remove the infected flowers in time and destroy them in a centralized way to prevent infection to other flowers. At the beginning of the disease, Bordeaux and tobuzin can be sprayed to kill the bacteria as soon as possible.
