Orchid cultivation: the difference between natural fallen leaves and diseased leaves of orchids

Orchid cultivation: the difference between natural fallen leaves and diseased leaves of orchids

In the two seasons of spring and autumn every year, Lanyou may find that the yellow leaves in the basin suddenly cause panic. In fact, many of them are naturally fallen leaves.

The rate of necrosis is very slow, and sometimes the condition is alleviated, leaving half a leaf (it is impossible for a naturally fallen leaf to leave half a leaf). In soft rot, the leaves first lose their luster (at this time the head of the Reed has rotted and necrotic), and then die of dehydration, which can be gently pulled up, but not broken at the petiole. If Lan Youru found natural yellow leaves in these two seasons, most of them were sprouting new buds, so there was no need to panic.

Spring and autumn is the season for sprouting leaves every year. New sprouts need a lot of nutrients, and some old leaves will sacrifice themselves to transport the stored nutrients to the new buds. The characteristics of the fallen leaves caused by this metabolism are: the leaves yellowed very fast, and it usually takes only a few days from discovery to full yellowing; there is no obvious boundary between yellow and green; when the leaves turn yellow, there is no symptom of dehydration, and after a few days the whole leaf turns brown and dry; after all the leaves turn yellow to the brown stage, a gentle touch can naturally fall off from the petiole; this kind of yellow leaf usually occurs on the old leaves of the old seedlings, but not all. General root disease and leaf disease, the leaf is a node of necrosis, there is a clear boundary.