Cookies on Plantwise Knowledge Bank

Like most websites we use cookies. This is to ensure that we give you the best experience possible.


Continuing to use means you agree to our use of cookies. If you would like to, you can learn more about the cookies we use.

Plantwise Knowledge Bank

Your search results

Pest alerts

First report of powdery mildew caused by Erysiphe cruciferarum on Brassica juncea in Vietnam.

Tam, L. T. T. ; Dung, P. N. ; Liem, N. V.

Plant Disease 2016 Vol 100 No. 4 pp. 856-857;


Brassica juncea, belonging to the Brassicaceae, is usually consumed as a raw, fresh vegetable in the diet of Vietnamese people during the winter and spring seasons. In February 2014, powdery mildew was first observed on 80 to 100% of the area under B. juncea cultivation in Ha Noi and Lang Son. Within a week, symptoms appeared as irregular white patches on both sides of the leaves, and entire plants were affected. Economic loss was unavoidable as farmers were unable to safely spray chemicals in time to suppress the disease. Based on morphological characteristics, sequence analysis of the rDNA internal transcribed spacer region and a pathogenicity test, the causal agent was identified as Erysiphe cruciferarum. This fungus is also known to infect numerous host species belonging to various genera of the Capparidaceae, Fumariaceae, Papaveraceae, Resedaceae, and Brassicaceae and is almost circumglobal in range, including Africa, North and South America, Asia, Australia, Europe, New Zealand. This is thought to be the first report of E. cruciferarum on B. juncea in Vietnam.