Disease and Pest Control of Rosa bromeliad

1. Powdery mildew

1. Symptoms

White mildew spots will grow on the leaves, and large diseased leaves will eventually turn brown. When young leaves are infected, they will turn purple-red and eventually be covered with a layer of white powder. In severe cases, the leaves will gradually wither.

2. Reasons

Because the bacteria overwinters in the plants, the disease will occur when the temperature rises above 20 degrees, so April to May and September to October are the peak periods of the disease. In other words, the disease of roses is closely related to the temperature.

3. How to prevent

We should choose rose varieties that are resistant to powdery mildew for planting. At the same time, we should prune them in winter and remove diseased branches in time to prevent roses from getting sick at the source.

4. Notes

To reduce diseases, proper ventilation and light transmission are required, and less nitrogen fertilizer should be applied. When using medications, pay attention to the safe interval period and do not increase the dosage or shorten the interval period arbitrarily.

2. Pests

1. Scarab

Anyone who has raised this plant should have seen beetles on the leaves. People who grow it year-round may say that this is a sign of health, meaning that the plant has not been sprayed with pesticides. However, we should know that if a plant has a beetle, it does not matter. But too many insect pests would be a disaster, as beetles like to eat the rhizomes and leaves of roses. It will seriously affect the yield and quality of flowers.

Prevention and control methods: You can use lights, willows, etc. to attract beetles and thus reduce their numbers.

2. Pterocarpus

When the plants are older, they will attract the rose moth to a great extent. Generally, rose insect infestations are mainly concentrated in the hot summer, and the most serious period is late summer. The high temperature has a positive effect on the development of the rose moth. The caterpillar moth will eat the leaves, and the plant will not have the tools for photosynthesis and growth, let alone growth. If the leaves get sick during this period, the flower may suffer heavy losses and unfortunately die.

Prevention and control methods: Check for insect eggs in time during winter and remove them in time.