Control of common diseases and insect pests in growing roses

The common diseases of rose are rust, black mildew, powdery mildew and so on.

Rust often harms the leaves, young branches and flowers of roses. In the early stage of the disease, rust red spots appeared in the leaf color, and when the leaf was serious, the leaf scorched and fell off, which affected the flowering in the coming year. Prevention and treatment: diseased leaves should be removed in time and destroyed centrally. It can also be prevented by spraying 150 × 200 times equal volume Bordeaux solution every half month from May to August, and 300 times of sodium rust solution can be sprayed during the onset period.

Black mildew mainly harms the base of leaves and buds and causes a large number of fallen leaves in rainy, stuffy and hot days. Control methods: before plant germination, spray with 3-5-degree stone-sulfur mixture; at the initial stage of the disease, 50% thiophanate-methyl wettable powder can also be sprayed 600 times, once every 10 days, according to the disease for 3 times for 5 times.

The common pests of rose are rose stem and leaf wasp, rose night moth, blow cotton scale, red spider and so on.

Rose stem and leaf wasp is a stem borer, which mainly harms the stem of rose, causes branches to wither and leads to plant death. Control method: when pruning the plant, check the pulp of the root stubble and find that there is a decay track. You can drop 1-2 drops of 80% dichlorvos EC and seal it with mud; if you find that the tender branches are infringed, you can cut off and destroy them.

The nocturnal moth harms the leaves with larvae and bites buds and flowers at the same time. Control method: it can be sprayed with 1000 times of 90% crystal trichlorfon or 1000 times of fenitrothion EC.

The red spider harms the front and back of the leaves, causing the leaves to wither and fall off. Prevention and treatment: at the initial stage of the disease, 20% diclofenac EC 1000 / 1500 times or 20% diclofenac wettable powder 800 / 1000 times can be sprayed, both sides of the leaves should be sprayed, once every 15 days, generally 1 / 2 times.