How to prevent disease on roses when the rainy season is coming
The rains bring a lot of benefits to the plants because in the rainwater there are many micronutrients that will make the trees develop young shoots, green leaves and high stems. But for roses, a plant susceptible to disease when the humidity is high, what should we do to prevent the tree from being infected?
Common diseases when humidity is high
Black spot disease
Appears first on the leaf at the bottom of the tree. As symptoms continue, a yellow border or halo develops around each spot. Some spots may grow together to form large spots. Large yellow spots often appearing on leaves are detected a lot just before they fall off the tree. Usually, deciduous leaves begin at the base of the tree and gradually spread to the top until all but the youngest leaves are lost. Heavy leaf shedding reduces the flower yield and vitality of the plant.
Late Blight
This is a common disease of roses that occurs in humid, cloudy conditions. Three to four rainy days with moderately warm temperatures will cause downy. Symptoms occur mainly on leaves and branches. Large red to brown corner spots are sometimes surrounded by a yellow halo appearing on the leaves. Unlike the black spot, which attacks the lower foliage first, downy dew attacks new growth at the top of the tree and moves down to the lower foliage. Both can wreak havoc on your rose tree.
How to prepare and prevent disease when the rainy season comes
- Put pink pots up about 10-15cm above the ground to drain water well when heavy rain.
- Prune old branches and leaves.
- Remove dry leaves around pots and planting areas.
- Spraying to prevent fungus.
If there are many consecutive rainy days and high humidity, you will certainly not be able to spray on these rainy days. You often choose a rainy day to spray fungicides for plants. The best time to spray is between 5-6pm. The next morning before 9am you should spray water again to wash away the remnants of the drug. Doing so will not scorch and curl the leaves.
If there are many consecutive rainy days and high humidity, you will certainly not be able to spray on these rainy days. You often choose a rainy day to spray fungicides for plants. The best time to spray is between 5-6pm. The next morning before 9am you should spray water again to wash away the remnants of the drug. Doing so will not scorch and curl the leaves.
