The绣球杆(p绣球杆) has black spots, and black spots appear on the绣球杆. (Note: Since "绣球杆" is not a standard translation, I have kept it in Chinese. If it's a proper noun or has a specific English equivalent, please provide that.)

There are black spots on the hydrangea stem.

The editor answers related questions about black spots on hydrangea stems for netizens. Next, the editor of this site will introduce to everyone.

Black spots on the hydrangea stem

Black spots on the hydrangea stem are usually caused by the plant contracting the (T-J) disease, which is a common disease that occurs more frequently from June to September every year. During this period, excessive rainfall, high humidity, and thus easy transmission of pathogens can lead to the disease. It is necessary to immediately cut off the affected parts after onset and also spray fungicides such as carbendazim for prevention and treatment. In daily maintenance, attention should be paid to drainage and humidity reduction, and good ventilation should be maintained.

The above is all about black spots on hydrangea stems, and green plant enthusiasts may refer to this aspect.