Common Reasons for Black Stalks in Roses
For most women, the common causes of black stalks in roses are related to horticultural knowledge. Detailed information will be shared next.
Those who care for roses often encounter the issue of black stalks. What are the causes of this problem, and how can it be prevented and treated?
Common Reasons for Black Stalks in Roses
It's well known that roses are prone to diseases and pests, so enthusiasts often carry out regular pest prevention. However, there are always a few weak rose plants that easily develop black stalks. What exactly causes this? Here are some common reasons that lead to black stalks in roses.
1. -- Severe Black Spot Infection --
Black spot is one of the most common diseases in roses. If a rose branch is infected with black spot and not treated promptly, severe black spot can cause dark brown patches on the branches, which look similar to black stalks.
Severe black spot can affect the growth of roses but doesn't directly threaten the plant's life like black rot. It usually just requires timely treatment with fungicides, and the infected branches can still be retained.
2. -- Infection with Black Rot Fungus --
Roses are most susceptible to black rot in high humidity and high-temperature environments, leading to blackened,腐烂, and withered branches. This is especially common in summer when temperatures are high, and the internal branches of the plant have poor ventilation, making them more prone to black rot and withering.
For some weak rose plants with poor growth, their decreased resistance makes them more susceptible to black rot. For weak rose plants, attention should be paid to water control and disease prevention. When black stalks are found in roses, if they occur at the top or middle of the branches, the diseased area should be thoroughly cut off, along with a section of healthy branch, and fungicides should be sprayed.
Common Reasons for Black Stalks in Roses
However, if the black stalk starts from the root, it is more difficult to handle. Generally, the rose plant needs to be removed from the pot, the blackened branches and roots cut off, and a fungicide powder applied to the wound before replanting after the wound has dried.
3. -- Black Stalks Caused by Fertilizer Burn --
In fact, many times, black stalks in roses are caused by improper fertilization. The season when black stalks in roses most commonly occur is from the transition between spring and summer to the transition between summer and autumn. During this period, the temperature is relatively high, and the growth state of roses can vary greatly.
Rose varieties that are more heat-tolerant continue to grow in summer, and fertilization generally doesn't pose a problem. However, some varieties with poor heat tolerance may already start to slow down in growth during the transition between spring and summer, leading to reduced tolerance for fertilizer. General fertilization at this time can easily cause fertilizer burn.
Most of the time, fertilizer burn in roses is manifested as yellowing leaves, but in high temperatures, excessive fertilizer can cause black stalks directly. Therefore, it's best to avoid applying fast-release fertilizers to roses during high temperatures. For specific fertilization methods for roses at different stages, you can refer to the book "How to Grow Explosive Roses from Scratch."
For black stalks caused by fertilization, there is often still a chance to save the plant. For example, if the problem is caused by organic or slow-release fertilizers, it is recommended to dig out the fertilizer and water the plant with a large amount of clear water. If the black stalks are caused by water-soluble fertilizers, you can water the plant with a large amount of clear water and retain the blackened branches. If discovered in time, the plant can usually be saved.
The above introduction to the common reasons for black stalks in roses is shared for your enjoyment!