Cause: as a result of the low temperature caused by frostbite, frostbitten leaves prone to black spots.
Solution: the pineapple itself can't grow at low temperature, at least it should be kept above 10 ℃. So move to the room immediately after being frozen, so that it can effectively keep warm. If it's warm, don't put the flowerpot on the ground, or it will be burnt. If the room temperature is not enough, plastic bags can be used for heat preservation.
Reason: Green pineapple prefer to grow in a cool environment, sunlight will cause black spots on the leaves.
Solution: in the hot summer, shade the pothos, or move to the half shade. Can occasionally receive scattered light, but can not be illuminated by strong light
Cause: the air is not easy to breed bacteria, while low oxygen content will also be bad for the respiration of the leaves of the pothos, resulting in black spots.
Solution: move the pineapple to a well ventilated place. As long as it is not winter, windows can be opened for ventilation. In winter, plastic bags should be put on at noon, and holes should be made in the bags to avoid frostbite. In addition, the blades should be watered to properly raise the air humidity.
Cause: leaf spot is a common disease. After the disease, there are brown spots on the leaves, which will turn black later.
Solution: cut off the diseased branches and leaves on the pothos, and spray the mancozeb for prevention and control. In addition to this, it should also be placed in a place with good air circulation, and can also be properly applied with compound fertilizer to avoid recurrence.
