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Bacterial Phylum Tenericutes01:24

Bacterial Phylum Tenericutes

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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Bacterial Phylum Bacteroidota01:26

Bacterial Phylum Bacteroidota

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The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
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Bacterial Phylum Spirochaetes01:30

Bacterial Phylum Spirochaetes

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Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
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Bacterial Phylum Actinobacteria01:30

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Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
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Bacterial Phylum Planctomycetes01:26

Bacterial Phylum Planctomycetes

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Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...
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Microbial Classification System01:24

Microbial Classification System

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Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...
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Pest categorisation of Paracoccus marginatus.

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    The papaya scale (Paracoccus marginatus) is a highly polyphagous pest spreading globally. Its establishment in the EU poses a significant risk to agriculture due to favorable climate conditions and potential yield reductions.

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    Area of Science:

    • Plant Health
    • Entomology
    • Pest Risk Analysis

    Background:

    • Paracoccus marginatus (papaya scale) is a Hemiptera: Pseudococcidae pest native to Central America.
    • Since the 1990s, it has rapidly spread to tropical regions globally, with recent detections in Israel.
    • This pest is not currently present in the EU and is not listed in relevant EU regulations.

    Purpose of the Study:

    • To perform a pest categorization of Paracoccus marginatus for the European Union (EU).
    • To assess the potential risk of Paracoccus marginatus establishing and spreading within the EU.
    • To determine if Paracoccus marginatus meets criteria for a potential Union quarantine pest.

    Main Methods:

    • Review of scientific literature and databases on Paracoccus marginatus biology, distribution, and host range.
    • Analysis of climatic suitability for establishment in EU regions.
    • Assessment of potential entry pathways and impact on EU agriculture.

    Main Results:

    • Paracoccus marginatus is highly polyphagous, affecting 172 genera across 54 families, including key EU crops like citrus, grapevine, and tomato.
    • Favorable climatic conditions exist in southern EU areas (Cyprus, Greece, Italy, Spain) for establishment and spread.
    • Potential entry pathways include plants for planting, fruits, vegetables, and cut flowers.

    Conclusions:

    • Paracoccus marginatus poses a significant threat to the EU due to its polyphagy, reproductive capacity, and potential for establishment.
    • Establishment could lead to substantial reductions in yield and quality of important cultivated crops.
    • Phytosanitary measures are recommended to mitigate the risk of entry and spread, and the pest meets criteria for potential Union quarantine status.