Diseases and Pests of Climbing Roses and Their Control

Common pests

aphid

This can be said to be the public enemy of all flower growers. It occurs throughout the year, but is most severe in spring and autumn. Their presence can cause leaves to be damaged, deformed or even fall off. And they appear in dense groups, which is disgusting. The most effective drug ingredients against them are acetamiprid and imidacloprid.

Thrips

These pests are present all year round, but they are mainly active at night. They mainly suck the sap, so the flowers cannot get enough nutrients. If the seedlings of flowers are attacked by these insects, there is a high probability that the seedlings will die directly. Even the grown plants will have deformed leaves or even more serious diseases. Acetamiprid and imidacloprid are also effective drugs for eliminating this pest.

Red Spider

This pest likes hot and dry environments, so summer is the peak period for them to wreak havoc. It is also possible to appear in the greenhouse during seasons such as autumn and winter. The leaves of plants attacked by them will generally turn yellow, and in severe cases the leaves may fall off. However, red spider mites can be prevented. In early summer, spraying drugs such as mitraz once every half a month can effectively prevent the appearance of red spider mites. If insect infestation has already occurred, the frequency of medication can be increased as appropriate.

Rose sawfly

They can be said to be capable of doing all kinds of evil. This pest goes through a sinful life from larvae to adults. The leaves, flowers and even the stems of the rose can be harmed by rose sawflies. They have a short lifespan but can reproduce 3 to 4 generations throughout the summer. To prevent them, you can use pesticides such as phoxim.

Rose leafcutter bee

As the name suggests, they mainly damage the leaves of roses. Because they cut through leaves very quickly, it is best to deal with these insects soon after they become larvae or adults. The drugs used for prevention and control are basically similar to those for rose sawflies. Phoxim and Cypermethrin can both have good effects.

Common diseases

Common diseases of climbing roses are black spot and powdery mildew.

powdery mildew

It is recommended to spray the pesticide for prevention before germination, and use chlorothalonil solvent for treatment when the disease occurs.

Black spot

It is prone to occur in summer and can easily cause leaf fall when the disease occurs, seriously affecting the ornamental value of the plant. It is recommended to spray Bordeaux mixture or lime sulfur mixture every week for relevant treatment.