In an agriculture field re is a prevalence of following organism and crop disease which are affection crop yield badly ________________.

White rust or white blister caused by the oomycete Albugo candida. White rust is an obligate parasite that attacks vegetative and flowering structures of the plants and can cause yellow lesions on the upper surface and white pustules (mainly on the underside) of leaves and can cause malformation of inflorescences. Dispersal and infection are favoured in cool and humid conditions in spring and autumn. Dispersal is mainly done by wind and water. Several species of Albugo can attack Brassicaceae crops and weeds, but Albugo candida is the main species identified in Brassica crops.