Ecofriendly approaches for the management of rose powdery mildew (Podosphaera pannosa var. rosae)

Abstract

Rose and miniature rose powdery mildew caused by Podosphaera pannosa is the most important disease in greenhouses and outdoor plantations. The use of fungicides, as a control method, is detrimental to nature and paid public interest. This work was aimed to utilize ecofriendly methods represented with plant extracts and antagonistic fungi. Among 13 plant extracts tested in vitro, garlic (Allium sativum), ginger (Zingiber officinale), and rosemary (Rosmarinus officinalis) were the most effective bioagents that resulted in a significant reduction of conidia germination. This result is supported by the greenhouse assessment of the selected extracts, in which the powdery mildew disease was reduced by up to 88.1%. The use of the commercial product of T. harzianum in the greenhouse was effective as plant extracts.

Keywords

• powdery mildew
• rose
• plant extract
• control