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How To Fight Powdery Mildew?
Aug 27, 2017

In agricultural field, Powdery mildew is a serious threat to crops. Therefore, It's important to study the plan to fight powdery mildew.

Three natural substances that show antifungal activity against Blumeria graminis f. sp. hordeiwere isolated from roots of Rumex crispus and identified as chrysophanol, parietin, and nepodin. The substances were tested for plant disease control activity in vivo against six plant pathogenic fungi. All specifically reduced the development of barley powdery mildew. The concentrations required for 50% disease control were 4.7 μg/ml for chrysophanol, 0.48 μg/ml for parietin, and 20 μg/ml for nepodin. These agents showed both curative and protective activity against barley powdery mildew. Chrysophanol (100 μg/ml) and nepodin (400 μg/ml) were more effective than the fungicides fenarimol (30 μg/ml) and polyoxin B (100 μg/ml), under glasshouse conditions, against cucumber powdery mildew, which is caused by Podosphaera xanthii. Parietin (30 and 10 μg/ml) reduced the development of cucumber powdery mildew as efficiently as fenarimol (30 μg/ml) and more effectively than polyoxin B (100 μg/ml).


Where Are You Buying The High Quality Physcion And Chrysophanol?

Xi'an Natural Field Bio-Technique Co.,Ltd. as Rhubarb Root Extract Manufacturer, which is the professional Manufacturer of Herbal Extract Since 2005. They focus on researching the rhubarb extract. The physcion(also named parietin) 10%, 98% and Chrysophanol 98%, Emodin 80%, 98% are the main products. If you need these products, please contact us or send an inquiry to info@natural-field.com at any time.