Orchid leaf tip burn can reflect the health condition of orchid roots

Judging the condition of orchid roots by leaf tip burn Some orchid growers find leaf tip burn a headache, and its causes are very complex: it may be caused by excessive dryness or fertiliser, or by abrasion and infection, and root rot may also be occurring. Once leaf tip burn occurs, it cannot be erased!! The commonly used methods are cutting the leaf (down to the green part), skipping over it, piercing it through, and so on, to control it. Interested orchid growers might as well try the fold-over method: fold the leaf at the green part below the burned tip, blocking the water supply and curbing the expansion of the leaf tip burn. When folding, sometimes a snapping sound can be heard, which shows that the leaf tip burn was caused by excessive dryness; if there is no sound and moisture seeps out at the fold, this may be due to excessive moisture or fertiliser burn (fertiliser burn first looks like something cooked, then infection spreads). Through this fold-over check, the problem can be discovered, so that the right remedy can be applied and it can be dealt with! This is much more fun than just cutting it off! In addition, using the fold-over method to deal with the burned tip part has another diagnostic function: observing the development of the leaf tip burn and disease spots above and below the fold line. Generally, within 3-5 days it can be found that: the part above the fold line dries up, changing from dark brown to yellow-brown and then to white, and no more lesions appear below the fold line. This indicates that the leaf tip burn was caused by fungal infection after physical damage, and that blocking the water supply can control the development of the leaf tip burn; at this point, simply cut off the whitened part. If lesions continue to occur below the fold line, and after folding again further down, dark brown disease spots still appear below the fold line, then one should suspect that pathogenic bacteria have invaded the roots and been transported to the wound at the fold line, manifesting as an expanding condition. In this case, it is recommended to check the roots, even to the point of repotting and replanting! To prevent leaf tip burn, mainly control the dryness and moisture of the growing medium, and the medium formula must emphasise air permeability! Never apply fertiliser too concentrated, at least above one part per thousand, and it can even be a bit weaker! At the same time, maintain ventilation in the orchid growing area and a certain level of environmental humidity! If leaf tip burn or disease spots occur, the above method can be used to deal with them! Everyone can give it a try! Images related to this topic are as follows: http://www.shorchid.com/lhbbs/dispbbs.asp?boardID=8&ID=2293&page=8