What types of tip burn and tip shrink are there in orchids?

Orchidclassification of tip burn and tip shrink Inorchidcultivation, cases oforchidtip burn and tip shrink often occur, and there are four types of this phenomenon

1. When the inside of the pot is too dry, or the air humidity is too low, or the pot surface is too dry, in this situation the orchid leaves generally cannot show tip shrink immediately. The first reflection is that the orchid leaves appear dehydrated. After watering restores them, the plant tends to decline starting from the old seedlings, and the orchid leaves turn yellow from the top downward. If there is water damage inside the pot, the orchid leaves turn yellow from the bottom upward, and the decline is slower;

2. Fungal damage to orchid roots or waterlogging of the orchid root crystal tips should be the same in principle. Waterlogging is the process, rotting of the crystal tips is the result, and tip burn is the surface phenomenon. In this kind of tip burn, as Feixiang said, the leaf tips turn black. After treatment in the pot, the tip burn generally no longer extends downward;

3. Tip burn caused by fertilizer damage: the burned tip area is brown or black, and the boundary with the parts of the orchid leaf unaffected by fertilizer damage is very obvious. Moreover, spots from fertilizer damage also easily appear on normal orchid leaf tissue. Such irregular round spots have a brown center, and where they contact normal tissue there is a ring of black spots of uneven thickness, with a very obvious boundary as well;

4. When orchid plants suffer fungal damage, much of it is shown through the phenomenon of tip burn. For example, with tip blight, the burned tip is white-brown, and the junction with normal orchid leaf tissue is dark brown; the white-brown area is the dead, dried-out zone, and the dark brown area is the zone where the fungal damage is active. With leaf blight, the light brown leaf tip is the dead, dried-out zone, and the dark brown area is the zone where the fungal damage is active; where it contacts normal orchid leaf tissue, it mostly appears yellow-green, and this yellow-green area is the infected zone of normal orchid leaf tissue, which differs from tip blight. Anthracnose also easily shows tip burn, with the leaf tip appearing as one section dark brown and one section light brown, developing alternately toward the lower part of the orchid leaf, and independent or connected dark brown patches also appear in the leaf blade, with the outer edges of the patches appearing light yellow.