Some plants grow and survive in unfavorable habitats such as dry soil and extremely dry or arid conditions. These plants are most susceptible to be infected by ______________.

Plants growing in  extremely dry soil and arid conditions that are under stress will be more prone to infection. Powdery mildew is a powdery fungus that grows mostly on the upper surface of leaves. It is usually white in colour. It will occasionally spread to the underside of leaves and other parts of the plant, such as stems and sometimes flowers and fruit. Powdery mildew prospers in dry soil conditions.