Diseases and prevention methods of Schefflera arborvitae

Schefflera leaf spot

symptom

In the early stage of the disease, many small gray-brown or gray-white spots will appear on the back of the leaves, gradually forming reddish-brown bumps. Gradually, sparse black small particles visible after cleaning can be seen. When the disease is severe, the spots aggregate to form large spots and the entire leaf withers.

Prevention and treatment methods

When you find that the Schefflera is diseased, remove the diseased leaves in time. During this period, keep the potting soil dry and strengthen maintenance. Apply thin fertilizer once a month to avoid excessive nitrogen fertilizer.

After the disease occurs, timely drug prevention and control can be carried out by spraying 1000 times diluted 25% thiophanate-methyl emulsifiable concentrate or 500 times diluted 40% benomyl suspension.

Anthracnose of Schefflera

symptom

When the disease occurs, nearly circular or irregular spots appear on the leaves, which are about 0.6 to 1.2 cm in size and slightly sunken, with brown or dark brown edges. There are many small black spots around the lesions. The disease is most serious in June and July.

Prevention and treatment methods

During maintenance, pay attention to watering moderately and do not allow water to accumulate in the potting soil. From June to July, appropriately lower the relative humidity of the plant's growth environment. Lower the temperature appropriately to avoid creating a suitable habitat for pathogens.

In the early stage of the disease, spray pesticides. You can choose 800 times diluted 80% mancozeb + 3000 times spray of Haoshi for prevention and control.