Yellow coke rot spot

If you look at the orchid leaves, except for the sealing tip of the normal bluegrass, it is nothing but yellow, coke, rot and spots.

Yellow: the leaf color changes from light to yellow from the top to the bottom, until the whole leaf is old yellow. This is the most normal phenomenon of weeding.

Focus: leaf tip dry scorched, brown or light brown, from top to bottom, varying in speed, which is often caused by overdrying

Rot: the leaf tip shows black rot from top to bottom, often cut a section, black rot a section, the speed has the difference between slow and fast. This is mostly caused by excessive fertilizer and water.

Spots: spots can be divided into regular and irregular. Rules are usually caused by the invasion of pathological bacteria; irregularities are often caused by cold or sunburn, or overdose or virus infection.