Agriculture of Fruit Vegetables: Melon powdery mildew
Agriculture of Fruit Vegetables: Melon powdery mildew. When growing melon, careful attention should be paid to powdery mildew or “white leaf disease”, a serious condition that can cause significant yield losses if it starts early. It is therefore important to know the proper cultural techniques and effective means to prevent this pathology.
Agriculture of Fruit Vegetables Melon powdery mildew: Responsible Agents and Transmission
The powdery mildew of the melon is caused by fungi , the most common being Erysiphe cichoraceum, which is most often reported when grown outdoors, and Sphaerotheca fuliginea, which is very common in indoor cultivation. The transmission of spores from these parasites occurs when temperatures are between 10 ° C and 32 ° C, as well as under a humid atmosphere. It is still possible to note a development of strains of these mushrooms in dry weather. Several spontaneous hosts, such as the sowtheater, facilitate the transmission of these agents of melon powdery mildew. It takes 3 to 7 days for the incubation to be effective.
Agriculture of Fruit Vegetables Melon powdery mildew: SYMPTOMS
Powdery mildew is manifested on the melon by white and powdery circular spots on its foliage. These spots have a progressive evolution and, little by little, are found on both sides of the leaves. Then we notice a stunting of these before they dry out completely. It must be known that the fruit does not show any symptoms. In fact the disease weakens the plant, which has the effect of reducing the harvest.
Agriculture of Fruit Vegetables Melon powdery mildew: Fight against melon powdery mildew
There are effective preventive methods to control melon powdery mildew and these are based on the adoption of good cultural practices. It is therefore recommended not to plant too tight and air well, especially when the crop is under shelter. Still in this mode of cultivation, the choice of recent hybrid varieties of melon can prevent powdery mildew because of their good resistance to this disease. For fertilization, manures that are too rich in nitrogen are not recommended because they favor the disease. A contribution of compost is more indicated.
When the plants are already affected, it is necessary to immediately remove the parts showing symptoms. It is possible to stop the evolution of the disease by a remedy called “small horsetail fields” which is very rich in organic silica. However, the treatment is not always satisfactory when the weather is hot and humid. In this case, we must opt for sulfur, which is known as the classic remedy against powdery mildew.