Powdery Mildew of Rapeseed and Mustard, Symptoms, Causal Organism, Disease Cycle скачать в хорошем качестве

Powdery Mildew of Rapeseed and Mustard, Symptoms, Causal Organism, Disease Cycle

Powdery mildew of rapeseed and mustard. introduction of powder medium of rape seed and mustard. Symptom of powdery mildew of rapeseed and mustard. Etiology of powdery mildew of rapeseed and mustard. Disease cycle of powdery mildew of rapeseed and mustard. Erysiphe crucifearum Symptoms can be seen on aerial parts of plant like leaves. White circular floury patches appears on upper and lower surface of leaves. In advance condition patches covers large area and affected part distorted. Powdery mildew usually appears late in season. Severe infection foliage become yellow causing forced maturity. Etiology Pathogen is an obligate parasite. Mycelium is septate, branched, white in colour and ectophytic Entire thallus except haustoria superficially present. Conidiophores short, erect and septate. Conidia hyaline, cylindrical, single celled borne singly or in chains and germinate by germ tube. Cleistothecia brown to black, globose,minute with numrous appendages. Asci oval to pyriform, sessile Ascospores hyaline, ovoid single celled borne within ascus. Life cycle Pathogen survive in the form of cleistothecia as plant debris in the field. Cleistothecia serve as primary inoculum. Secondary inoculum provide by wind borne conidia.