Diseases and prevention methods of Albizia Julibrissin

Diseases of Albizia Julibrissin: Rust

symptom

The disease occurs from late October to April of the following year.

When Albizia albizzia is infected with rust, some light yellow spots will appear on the back of the leaves, and white blisters will form on the spots.

In the early stage, rusty brown-yellow powder is dispersed in the blisters, which is the summer spore pile of the pathogen. In the later stage, dark brown powder is dispersed in the blisters, which is the winter spore of the pathogen. It is acacia rust fungus, belonging to the subphylum Basidiomycota, class Tylosporales, and order Puccinellales.

Prevention and treatment methods

Spray 0.3 lime sulfur mixture, or 400 times diluted 75% thiophanate-methyl wettable powder, once every 10-15 days, and spray 2-3 times in a row.

Diseases of Albizia Julibrissin: Fusarium Wilt

symptom

Albizia wilt disease is a systemic infectious disease with a high incidence rate. Both seedlings and large trees will be harmed, posing the greatest threat to the growth of Albizia.

The disease is more serious in high humidity and rainy seasons; the disease is prone to occur in areas with heavy soil, low terrain, poor drainage, and stagnant water; wounds caused during management processes such as transplanting or pruning increase the chance of Fusarium infection.

When the seedlings are infected, the leaves will gradually turn yellow, the roots will become soft, and they will fall over, and finally the whole plant will die.

If the mature plant is infected, symptoms will appear on a few branches first. The leaves will shrink and droop, becoming light green or light yellow, and then dry up and fall off. Then some branches will begin to dry up, gradually spreading to the entire plant until death.

If you cut open the trunk, you can see a whole circle of color-changing rings, and the cross-section at the root of the tree is brown or dark brown.

Prevention and treatment methods

Choose varieties with strong disease resistance for cultivation. When the seedlings grow 2-3 true leaves, spray them with 2000 times diluted methyl parathion once to prevent pests such as ants from harming the seedlings. Afterwards, spray foliar fertilizer on the leaves regularly and in a certain amount to improve the disease resistance of the seedlings.

For newly diseased plants, replace the soil and combine it with pesticide treatment to control the disease. Use 70% thiophanate-methyl wettable powder or 60% dolphate wettable powder 100 times diluted to spray the tree trunks or apply it; or use 14.5% quinoline water-soluble powder, 40% pentachloronitrobenzene powder 300 times diluted, and conventional concentrations of pesticides such as anti-bendazim, thiophanate-methyl, and carbendazim to irrigate the soil once every 8 days or so, for 3-4 times in a row.

Using 300 times diluted 70% thiophanate-methyl wettable powder and injecting it into the plants through infusion can improve the efficacy.