Common Pest and Disease Control Methods for Rose Cultivation

Common rose diseases include rust, black mold, and powdery mildew.

Rust often affects rose leaves, young branches, and flowers. In the early stage of the disease, rust-red spots appear on the leaves; in severe cases, the leaves wither and drop, affecting flowering the following year. Control method: diseased leaves should be promptly removed and destroyed together. You can also spray 150-200 times diluted equal-amount Bordeaux mixture once every half month from May to August for prevention; during the disease period, spray 300 times diluted ferrous dimethyldithiocarbamate for control.

Black mold mainly affects leaves and the base of flower buds. It is severe in rainy and muggy weather and can cause a large amount of leaf drop. Control method: before the plant sprouts, spray with 3-5 degree lime sulfur mixture for control; in the early stage of the disease, you can also spray with 50% thiophanate-methyl wettable powder diluted 600 times, once every 10 days, and spray 3-5 times continuously according to the condition for control.

Common rose pests include rose stem sawflies, rose noctuid moths, cottony cushion scales, and red spider mites.

The rose stem sawfly is a stem-boring pest that mainly damages rose stems, causing branches to wither and leading to plant death. Control method: when pruning the plant, check the pith of the root stubble. If a boring tunnel is found, drip in 1-2 drops of 80% dichlorvos emulsifiable concentrate, then seal the opening with mud; if young branches are found to be infested, they can be cut off and destroyed.

The rose noctuid moth damages leaves with its larvae and also bites flower buds and flowers. Control method: spray with 90% crystallized trichlorfon diluted 1000-1500 times, or 50% fenitrothion emulsifiable concentrate diluted 1000 times for control.

Red spider mites damage both sides of the leaves, causing them to dry and drop. Control method: in the early stage of the disease, spray with 20% dicofol emulsifiable concentrate diluted 1000-1500 times or 20% tetradifon wettable powder diluted 800-1000 times. Both the front and back of the leaves must be sprayed, once every 15 days; generally 1-2 sprays are sufficient.