The oomycetes form a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms that are relatively closely related to photosynthetic algae such as brown algae and diatoms. Plant pathogenic species, notably those of the genus Phytophthora, are the best-studied oomycetes. The genomes of four Phytophthora and one downy mildew species were recently sequenced resulting in novel insights...

Plant diseases and pests cause a large loss of world agricultural production. Downy mildew is major disease in grapevine. Conventional techniques for plant evaluations are time-consuming require expert personnel. This work investigates novel sensing technologies artificial intelligence applications assessing downy grapevine under laboratory conditions. In our methodology, machine vision applied...

Abstract Downy brome is a troublesome facultative winter-annual grass weed that invades agricultural and nonagricultural lands in western North America can cause substantial crop yield losses particularly no-till winter wheat. Glyphosate-resistant (GR) downy was identified southern Alberta 2021, representing the first confirmation of GR Canada. This study designed to evaluate alternative herbic...

In order to realize automatic disease diagnosis and provide related information for disease prediction and control timely and accurately, the identification and diagnosis of grape downy mildew and grape powdery mildew was conducted based on image recognition technologies. The method based on K_means clustering algorithm was used to implement unsupervised segmentation of the disease images. Fift...

Plot-scale field studies were conducted to evaluate the efficacy of steam for the control of cropland weeds in comparison with common herbicides. Weed densities, biomass, or emergence after treatment were measured. Steam (3,200 kg/ha, energy dosage equivalent to 890 kJ/m2, speed of 0.8 m/s) and glyphosate (560 g ai/ha) gave similar control (. 90%) of seedling common lambsquarters and seedling r...

Virus-like symptoms were recently observed on leaves of landscape and nursery downy and star jasmine (Jasminum multijlorum) and wax jasmine (J. gracile) in southeast Florida. Foliar symptoms included mottling, chlorotic ring spots and chlorotic line patterns. An agent was mechanically transmitted with difficulty from symptomatic leaves of downy jasmine to Nicotiana debneyi and N. tabacum 'Xanth...

Viticulture is carried out for different purposes in almost every region of the world. Although V. vinifera L. cultivars are most commonly grown species Turkey, their cultivation very limited Yalova and similar humid regions. In these regions, fungal diseases common due to heavy rain, sunlight stagnant air movement, especially spring summer months. For this reason, viticulture can only be perfo...

Downy mildew (Peronospora belbahrii) is a major disease of sweet basil (Ocimum basilicum). We examined the effects potassium, calcium and magnesium, individually in combination, on downy (SBDM) potted plants under commercial-greenhouse conditions over six growing seasons. An increased K concentration fertigation solution SBDM severity, whereas foliar-applied KCl K2SO4 suppressed SBDM. The appli...