What is the reason for the spots on petunia leaves? What is the disease of petunia leaves that are wrinkled?

Petunias and morning glories look similar, but petunias don't grow as tall as morning glories. Petunias grow very vigorously, but they still need to be carefully cared for. When you find black spots on the leaves of petunias, you must solve them as soon as possible, otherwise it will affect the entire plant. So why do petunias have black spots?

What are the spots on petunia leaves?

Generally speaking, this problem occurs at the beginning of summer and autumn, when plants are most likely to grow black spots. The incidence rate is very high. If not done properly, the plants may be infected. Black spots grow because the plants are infected with white rust fungi, which generally reproduce in autumn and cause plant black spot disease, which needs to be prevented in advance.

In addition, if it is a rainy day, because there is a layer of hair on the leaves of petunia, these hairs will prevent water from evaporating quickly. When there are continuous rainy days, water will accumulate on the leaves for a long time, affecting normal respiration and photosynthesis, and black spots may appear, and there will be signs of rot.

If the black spots are caused by bacteria, you need to remove the leaves with black spots and spray 800 times of carbendazim solution every seven days for three consecutive times, and the disease can be controlled. In the future maintenance process, if the leaves at the bottom of the petunia are too dense, they should be removed appropriately, more ventilation, more sunlight, and controlled watering.

What is the disease that causes wrinkled petunia leaves?

Petunias like to be exposed to the sun. The more sunlight they are exposed to, the more likely they are to bloom. When the weather is cold and the indoor temperature is low, petunias will shrink and their leaves will curl. This is normal. When the weather gets warmer and the ventilation is good, the situation will improve.

In addition, too dry conditions can also cause the leaves to become very dry. Petunias are very drought tolerant, but they also have limits, and when drought reaches their limits, they will wrinkle.

How to grow petunia well

1. Soil: Dwarf cattle are suitable for hanging pots. If they are well cared for, they can grow into a flower ball. You can use peat soil and perlite in a ratio of about 7:3. This kind of soil is light and breathable, which is conducive to the growth of the dwarf cattle root system.

2. Sunlight: It likes sunshine. If there is insufficient sunlight, it will grow too tall and the plant shape will be destroyed.

3. Watering: Pay attention to controlling the frequency of watering during the seedling period. Too frequent watering will cause the roots of the dwarf cattle to rot and die.

4. Fertilization: Dwarf cattleya can bloom every day for one or two years. You can usually use bone meal or potassium dihydrogen phosphate mixed with water to water the flowers. With sufficient phosphorus and potassium fertilizers, the dwarf cattleya can keep blooming.