Prevent and control rose black spot this way, and the flowers will cover the branches, big and vivid

Rose black spot is a commonly occurring rose disease, so friends who love roses need to understand the prevention and treatment methods for black spot on roses. Below we will help you understand rose black spot!

Symptoms of black spot:

When roses develop black spot, the plant's young shoots, pedicels and leaves may all be infected by the pathogen, appearing as purplish-brown or brown small spots, which are exactly the early stage of lesion development.

In black spot, the plant's young shoots and leaves etc. will have 3~5mm dark brown or black spots, some spots have fringed edges, while others have smooth, neat edges.

When rose leaves develop black spot, the leaves tend to fall off easily, and the young branches and pedicels will have purple or black elongated spots, slightly sunken. When the disease is severe, all the leaves on the middle and lower parts of the whole plant will fall off, and this situation is very serious.

Black spot prevention and control methods:

(1). Find the source of pathogen infection, promptly clean up and remove diseased leaves and diseased branches. In winter, appropriate pruning is needed for severe cases. Diseased leaves and branches all need to be cleaned up simply, to avoid infecting other healthy leaves and branches.

(2). Usually pay attention to the space size of the potted plant, do not let the plant be too dense. If overly long and dense branches are found, regular thinning and pruning are needed to maintain a transparent internal space, which is good for ventilation and light. When watering, do not let the potting soil be too wet; a humid environment is prone to pathogens. Water slowly along the edge of the pot, and do not spray-water frequently.

(3). Chemical treatment for plants in the early stage of disease: spraying should begin at the early stage, usually spraying once every 7~10 days. Use chlorothalonil wettable powder at 500 times dilution or buy a specialized chemical on the market for targeted treatment.