Inhibitory effects of the main compounds of oregano essential oil against some pathogenic fungi

The in vitro activity of essential oil compounds of Origanum heracleoticum L. was tested against Verticillium dahliae, Fusarium oxysporum, Phoma tracheiphila, Phytophthora cactorum and Botrytis cinerea by the well diffusion method using four different concentrations (from 1 x 104 to 1 x 10-2 μg·ml-1). Analyses by GC-ITMS of the oil extracted by steam distillation from dried inflorescences made it possible to identify 19 main compounds. The major compounds were thymol (39.10 %) followed by γ-terpinene (21.26 %) and ρ-cymene (11.23 %). Carvacrol and the plain essential oil at their higher concentrations showed an inhibitory effect against all pathogens tested. However, the percentage of inhib…

Lemon post-harvest decay control by natural products

Prime osservazioni sulla suscettibilità alla ticchiolatura di cultivar di nespolo del Giappone in Sicilia

Efficacy of the fungicide valiphenal against crown rot of rose caused by Phytophthora citrophthora

Crown and root rot caused by soilborne species of Phytophthora are common diseases of container-grown ornamental plants in nursery. Crown rot of Rose caused by P. citrophthora has been recently reported in Sicily (southern Italy). Valiphenal (IR 5885) is a systemic dipeptide fungicide of the valinamide class of compounds and is active against Oomycetes. This new fungicide is under development by the italian agrochemical company ISAGRO against powdery mildews of grapevine, potatoes and vegetables. In this study, the efficacy of Valiphenal and other experimental active ingredients was tested for the first time against crown rot of Rose. Phosetyl-Al (Aliette) was used as a reference product. M…

Control of powdery mildew in cut roses using natural products in the greenhouse.

Roses grown under greenhouse cultivation are commonly affected by diseases and regular fungicide applications are commonly used. The aim of this research was to identify natural products that can substitute and reduce the health and environmental impacts of typical chemical treatments in the control of powdery mildew [(Podosphaera pannosa (Wallr. Fr.) de Bary] and grey mould (Botrytis cinerea Pers.). Treatments were applied in the greenhouse on the cut rose cultivars Sunluck (Gold Strike®) and Nirpbredy (New Fashion®) growing in a soilless system. Oregano and clove essential oil at 0.5 ml/l (an emulsifier was added) and sodium bicarbonate (NaHCO3) at 4 g/l were sprayed on rose plants to run…

Evaluation of natural products to control some rose diseases.

Preliminary test to control Spilocaea eriobotryae (Cav.) Hugh, agent of loquat scab, by means of natural products

Lemon post-harvest decay control by natural products

Postharvest diseases of lemon fruits represent one of the most severe sources of loss production. They are controlled by imazalil (IMZ), thiabendazole (TBZ) and sodium ortho-phenil-phenate (SOPP) registered fungicides for postharvest treatments. Nowadays, the chemical use is becoming more restricted for environmental concerns and development of fungicide-tolerance strains of fungal pathogens. In the last few years a renewed interest in alternative methods of postharvest decay control has been increasing and the research for natural products has provided encouraging results. The aim of this research has been the in vitro and in vivo effectiveness evaluation of six essences (garlic, cloves, o…

The antimicrobial actitity of water extracts from Labiatae.

In vitro antimicrobial activity of water extracts of oregano, rosemary and sage were tested against five different fungi (Phytophthora cactorum, Verticillium dahliae, Fusarium oxysporum f.sp. lycopersici, Phoma tracheiphila and Botrytis cinerea). Infusion, decoction and maceration methods were used to obtain the extracts. Their inhibent effect on radial fungal growth was determined at three different concentrations (500 mL/L, 50 mL/L and 5 mL/L). After 4, 8 and 12 days the radial growth of the species was measured and fungitoxicity was recorded in terms of percent colony inhibition. The data obtained showed that while the extracts of rosemary and sage were less effective against all fungi t…

Efficacy of Clove Essential Oil an Sodium Bicarbonate to Control Powdwry Mildew and Grey Mould in the Strawberry Crops

Straberry growning in greenhouse is frequently affected by diseases which are controlled by means of chemical products.In order to find an alternative to synthetic fungicides, the antifungal activity of clove essential oil and Sodium bicarbonate were tested to control powdery mildew (causal agent Oìdium fragaria (Harz.)and grey mould and grey mould (Botrytis cinerea Pers.) "in vitro" and in planta essays "In vitro" essay the inhibition efficacy of natural substances was evaluated on O.fragariae conidial germination and on B. cinerea mycelial growth. The results showed a consistent fungicidal activity in all concentrations tested. In planta essay, treatments were carried out in greenhouse on…

Efficacia del Valifenalate contro specie terricole di Phytophthora patogene di piante ornamentali

I risultati confermano che il valifenalate su piante erbacee e arbustive è un prodotto sistemico e dimostrano che questo p.a., proposto come antiperonosporico, può essere efficace anche contro i marciumi radicali di piante ornamentali causate da specie terricole di Phytophthora.

Antimicrobial actyvity of main compounds of essential oil extracts from Sygygium aromaticum (L.) Merril et L.M. Perry.

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Loquat scab control by natural extracts, Further trials on treatment efficacy.