Post by ehsanulh125 on Jan 9, 2024 5:43:17 GMT
Cucumber is a common popular vegetable. I In the process of planting cucumbers, various diseases will inevitably appear, which will affect cucumber fruits, stems, leaves and seedlings. In order to ensure the production of cucumbers, it is necessary to make cucumbers healthy. W hat are the diseases of cucumber and their control methods? Let's take a look together! 1. Cucumber downy mildew Both the seedling stage and the mature plant stage can be affected, mainly damaging the leaves. Symptoms: After damaging the leaves, water-soaked spots appear at the beginning, and the spots gradually expand, showing polygonal light brown spots. When the humidity is high, a gray-black mold layer grows on the back or surface of the leaves.
When it is severe in the late stage, the lesions Country Email List rupture or connect. Chemical control: Promocarb Hydrochloride , Mancozeb + Dimethomorph, Azoxystrobin , Metalaxyl-M+ Promocarb Hydrochloride Cucumber downy mildew 2. Cucumber white powdery mildew It can be infected from the seedling stage to the harvest stage, and the leaves are the most severely affected, followed by petioles and stems, and the fruits are less affected. Symptoms: in the early stage of the disease, small white almost round powder spots appear on both sides of the leaves, and there are more leaves. Later, it expands into unobtrusive edges and continuous white powder. In severe cases, the whole Leaf is covered with white powder, and it turns gray in the later stage.
The diseased leaves are withered and yellow, but generally do not fall. Symptoms on petioles and stems are similar to those on leaves. Chemical control: pyraclostrobin , chlorothalonil , thiophanatemethyl, propineb Cucumber powdery mildew 3. Cucumber red powdery mildew Symptoms: mainly damage the leaves of cucumber in the late growth period. Dark green to light brown lesions develop on leaves. When the humidity is high, the lesions are thin, the edges are water-soaked, and they are easy to break. The longer the high humidity lasts, the easier it is for light orange mold to grow on the lesions, which expands rapidly and causes the leaves to rot or dry up. The colonies are initially white and then turn pink. Preventive agents: Iprodione Azoxystrobin, Chlorothalonil Cucumber red powdery mildew 4. Cucumber leaf Cucumber vine blight mainly damages stems and leaves.
When it is severe in the late stage, the lesions Country Email List rupture or connect. Chemical control: Promocarb Hydrochloride , Mancozeb + Dimethomorph, Azoxystrobin , Metalaxyl-M+ Promocarb Hydrochloride Cucumber downy mildew 2. Cucumber white powdery mildew It can be infected from the seedling stage to the harvest stage, and the leaves are the most severely affected, followed by petioles and stems, and the fruits are less affected. Symptoms: in the early stage of the disease, small white almost round powder spots appear on both sides of the leaves, and there are more leaves. Later, it expands into unobtrusive edges and continuous white powder. In severe cases, the whole Leaf is covered with white powder, and it turns gray in the later stage.
The diseased leaves are withered and yellow, but generally do not fall. Symptoms on petioles and stems are similar to those on leaves. Chemical control: pyraclostrobin , chlorothalonil , thiophanatemethyl, propineb Cucumber powdery mildew 3. Cucumber red powdery mildew Symptoms: mainly damage the leaves of cucumber in the late growth period. Dark green to light brown lesions develop on leaves. When the humidity is high, the lesions are thin, the edges are water-soaked, and they are easy to break. The longer the high humidity lasts, the easier it is for light orange mold to grow on the lesions, which expands rapidly and causes the leaves to rot or dry up. The colonies are initially white and then turn pink. Preventive agents: Iprodione Azoxystrobin, Chlorothalonil Cucumber red powdery mildew 4. Cucumber leaf Cucumber vine blight mainly damages stems and leaves.