Resistance Inducers for the Protection of Pedunculate Oak (Quercus robur L.) Seedlings against Powdery Mildew Erysiphe alphitoides

Abstract

Oak powdery mildew caused by Erysiphe alphitoides (Griffon and Maubl.; U. Braun & S. Takam.) is a common disease in European forests. One of the most susceptible species is the pedunculate oak (Quercus robur L.). Presently, a few methods are available to control powdery mildew, e.g., the use of fungicides (e.g., based on citric acid), antagonistic fungi or bacteria, chemical treatments (e.g., sulphur, potassium bicarbonate) or genetic resistance. In our study, we aimed to check the effects of using chitosan derivatives and novel active substances inducing the plants’ natural resistance: benzodiathiadiazole (both in neutral and salt form). 84 pedunculate oak seedlings were subjected to the experiment in three treatment variants (plus positive and negative controls). The plants were treated with active substances and inoculated with E. alphitoides. Although the powdery mildew symptoms appeared in all variants, they were manifested mainly by the mycelium in the form of small spots. The experiment indicated that the highest limitation of powdery mildew mycelium was achieved by applying N-methyl-N-methoxyamide-7-carboxybenzo(1,2,3)thiadiazole (BTHWA). The application of BTHWA reduced disease development by 88.9% when compared to the effects of the other variants.

The Use of a New Ionic Derivative of Salicylic Acid in Sugar Beet Cultivation

“…Of particular interest is the investigation of methods providing efficient protection against various pathogens, as the problem of limiting the amount of active substances available for use in plant protection applies not only to substances registered for use on sugar beet. In our previous studies, we have demonstrated that our new SAR inducers provide effective protection against various diseases on many different plant species [33][34][35][36][37]. Results of this study indicate the possibility of reducing fungicide treatments with the use of choline 3,5-dichlorosalicylate for providing protection against CLS.…”

Microorganism Isolates Stimulate Forest Crop Growth and Protection

“…and Microsphaera alphitoides. Thus, improved measures required for protection and reproduction of Scots pine, pedunculate oak and small-leaved linden [41][42][43]. A crops death important cause in the territory of coniferous-deciduous forests is an unhealthy and low-quality seedlings use for reforestation.…”

New biologically active ionic liquids with benzethonium cation‐efficient SAR inducers and antimicrobial agents

“…20,21 SAR is a natural plant defence mechanism which has a broad spectrum of action, most often concurrent against fungi, viruses, and bacteria. [22][23][24][25][26] Generally, resistance in plants is activated by pathogen attack or external application of substances that imitate pathogen-plant interaction (elicitors). The induction of SAR is followed by the accumulation of salicylic acid, an endogenous signalling molecule associated with SAR, which activates the production of pathogenesis-related proteins (PR) (with antimicrobial and antifungal activities).…”

“…Activation of this phenomenon in plants could be in future one of the very efficient and eco‐friendly methods of plant protection 20,21 . SAR is a natural plant defence mechanism which has a broad spectrum of action, most often concurrent against fungi, viruses, and bacteria 22–26 . Generally, resistance in plants is activated by pathogen attack or external application of substances that imitate pathogen–plant interaction (elicitors).…”