Which condition can promote Downy Mildew in crops?

Downy Mildew is a disease that thrives under specific environmental conditions, particularly high humidity combined with poor air circulation. When humidity levels are elevated, it creates a moist microenvironment that favors the growth and reproduction of the pathogens responsible for Downy Mildew. Poor air circulation exacerbates this issue, as it prevents the rapid evaporation of moisture and allows humidity to persist in the shaded areas of the crops. This combination creates ideal conditions for the pathogen to infect the plants, leading to the spread of the disease.

Factors like low soil moisture, visible sunlight, and high soil pH do not support the development of Downy Mildew. Low soil moisture usually helps in reducing the overall humidity around plants. Visible sunlight helps to dry out moisture on plants, making the environment less conducive to the growth of mildew. A high soil pH is more related to nutrient availability and soil health rather than directly influencing the humidity levels that promote Downy Mildew. Thus, high humidity coupled with poor air circulation is critical in encouraging the prevalence of this disease in crops.