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Actually, the trumpet tree (Catalpa bignonioides) applies - please do not confuse this with the similar-sounding angel's trumpet (Brugmansia)! - as quite uncomplicated. However, if the deciduous tree is not cared for enough or in the wrong location, it can develop signs of discomfort, for example by turning its leaves yellow and/or simply shedding them. Unfortunately, the exotic species is also quite susceptible to the dreaded Verticillium wilt.
There can be a variety of reasons when the trumpet tree sheds its leaves
Nutrient deficiencies and drought are common causes
In most cases, however, the reason behind the shedding of leaves is not the wilt disease, but simply a lack of nutrients and / or water. Especially in the hot and dry summer months, it is recommended to water the trumpet tree both in the morning and in the evening. However, you should ensure good drainage - especially for specimens cultivated in tubs - because Catalpa also does not tolerate waterlogging. Regular fertilization is also essential, because the trumpet tree is one of the heavy consumers.
Avoid chlorosis
Chlorosis - i.e. diseases due to lack of nutrients - often shows up in yellowish discolored leaves, in which the leaf veins are clearly visible. As a rule, the plant in question lacks a certain mineral, often it is iron. Chlorosis can be treated very well and prevented even better, namely by sufficient fertilization. Young trees in particular need good fertilizer, with mature compost having proven to be particularly useful for planted specimens. For trumpet trees cultivated in tubs, on the other hand, good, not too nitrogen-rich universal fertilizers are recommended.
Verticillium wilt usually fatal
If whole shoots suddenly die off on apparently healthy trees and leaves dry up and fall off, the so-called wilt disease can be the cause. This is a fungal infection in which the soil-dwelling Verticillium fungi invade the wood of the tree via the roots and pathways, blocking the supply of water and nutrients there. So far, no herb has grown against this disease, you can only take the following remedial measures and hope to be able to save the tree with it:
- Cut back all affected parts of the plant far into the healthy wood.
- Never dispose of them in the compost!
- Dig up the trumpet tree and transplant it to another, more suitable location.
- Treat the tree with a tonic.
tips
Unfortunately, fungicides do not help at all against Verticillium wilt, as the fungus is deep in the wood. You can only prevent an infestation by carefully following the care and planting instructions and not planting the trumpet tree in a location where the disease has already occurred.