What Is Eucalyptus Wilt Disease? A Detailed Guide to Eucalyptus Cultivation Techniques
What is eucalyptus wilt disease? What causes eucalyptus wilt disease? What methods can be used to prevent and control it? Experienced netizens are asked to help explain. Zhongdi.net has compiled the damage, causes and control methods of eucalyptus wilt disease, listed below for netizens' reference. The damage of eucalyptus wilt disease: eucalyptus wilt...
What is eucalyptus wilt disease?What causes eucalyptus wilt disease? What methods can be used to prevent and control it?Experienced netizens are asked to help explainZhongdi.net has compiled the damage, causes and control methods of eucalyptus wilt disease, listed below for netizens' reference.
The damage of eucalyptus wilt disease:
Eucalyptus wilt disease mainly damages the roots and the vascular bundles of the stem, blocking the transport of water and nutrients, causing the branches of the crown to wilt and eventually die, and in severe cases the entire plant dies.
Infected eucalyptus trees first dry out at the tips of the branches, gradually spreading to the whole branch, and the leaves on them turn brown and dry up as well.
When the disease is severe, the entire plant dies. There are no obvious symptoms on the surface of the trunk, but on the cross-section of the trunk, greenish-brown discolored streaks can be seen on the annual rings of the sapwood. When cut lengthwise, the streaks can be seen spreading upward from the roots. If the cut surface is kept moist for 3-5 days, a dark brown mold layer grows, which consists of the conidiophores and conidia of the pathogen.
Causes of eucalyptus wilt disease:
The pathogen of eucalyptus wilt disease is a soil inhabitant, living saprophytically in the soil and overwintering as chlamydospores in the soil or on the trunk. The following year it mostly invades through the underground roots and then spreads upward.
In autumn, after the bark falls off, a large number of conidia are produced, and the conidia are spread by insects or other animals. The hyphae can spread within the vessels, clogging them and secreting toxins, causing the tree to wilt. Low-lying areas with high soil moisture are prone to the disease. Therefore, eucalyptus trees near houses, ditches and paddy fields are more commonly affected. When the soil is slightly alkaline and nematodes are abundant, the disease is often more severe.
Control methods for eucalyptus wilt disease：
1. Cut down and burn the diseased plants, then disinfect the soil with 200-fold formalin solution.
2. Control underground pests.
3. Strictly implement seedling quarantine, and it is strictly forbidden to use diseased seedlings for planting.
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