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251


First Report of 'Candidatus Phytoplasma citri' related strain (16SrII-C subgroup) associated with phyllody disease of cumin in India

Citation
Kumar et al. (2024). Plant Disease
Names
Ca. Phytoplasma citri
Abstract
Cumin (Cuminum cyminum L.), is an important export-oriented seed spice crop for India. Cumin is popularly used for flavouring food, including soups, pickles and vegetables, and for herbal medicine. India is the largest producer, consumer and exporter of cumin seed with an annual production of 0.795 million tones over an area of 1.09 million hectares. During 2020-21, India exported about 0.299 million tons of cumin worth of Rs 33280 million (Anonymous, 2021). Recently, phytoplasma suspected symp

First Report of 'Candidatus Phytoplasma australasiaticum' Associated with Phyllody, Virescence, and Witches’-Broom Disease in Chrysanthemum morifolium in Taiwan

Citation
Tseng et al. (2024). Plant Disease
Names
Ca. Phytoplasma australasiaticum Ca. Phytoplasma australasiae
Abstract
Chrysanthemum morifolium (Asteraceae) is commonly grown as commercial cut flowers or pot mums worldwide. Common diseases of chrysanthemum include bacterial blight, fungal diseases, viruses, and phytoplasmas (Verma et al. 2003; Taloh et al. 2020). In June 2022, C. morifolium plants showing virescence, stunting, witches’ broom, and phyllody symptoms were observed in 10 plants representing 10% of the estimated 100 plants in a field in Taichung City, Taiwan (Fig. S1). Three symptomatic samples alon

Diversity of “Candidatus Liberibacter asiaticus” strains in Texas revealed by prophage sequence analyses

Citation
De Leon et al. (2024). Plant Disease
Names
Ca. Liberibacter asiaticus
Abstract
Prophages/phages are important components of the genome of ‘Candidatus Liberibacter asiaticus’ (CLas), an unculturable alphaproteobacterium associated with citrus Huanglongbing (HLB) disease. Phage variations have significant contributions to CLas strain diversity research, which provide critical information for HLB management. In this study, prophage variations among selected CLas strains from southern Texas were studied. The CLas strains were collected from three different CLas inhabitant env

Occurrence of ‘Candidatus Phytoplasma asteris’-Related Strains infecting Chinaberry (Melia azedarach) Showing Chlorotic Leaf Symptoms on Hainan Island of China

Citation
Yu et al. (2024). Plant Disease
Names
Ca. Phytoplasma asteris
Abstract
Chinaberry (Melia azedarach), belonging to the family of Meliaceae, is an ornamental tree distributes across southern of China. In the autumn of 2021, In an area of 400 acres located in Wanning city of Hainan Province, a tropical island in China, with coordinates of 110°28′42.72″E, 19°2′9.96″N, about 20 % (100) of the chinaberry trees showed disease symptoms included chlorotic leaves. The disease symptoms were consistent with infections by a phloem-limited prokaryotic pathogen phytoplasma. The

First report of a 'Candidatus phytoplasma asteris' related strain (16SrI) associated with phyllody and witches’-broom symptom in Pisum sativum in Hisar, India

Citation
Dhillon et al. (2024). Plant Disease
Names
Abstract
Pea (Pisum sativum L.) is a leguminous vegetable crop, and India holds the fourth position in the production, primarily contributed by three major states: Uttar Pradesh, Madhya Pradesh, and Punjab (Anonymous, 2022). However, a survey conducted in February 2023 at the National Seed Corporation Farm (15 hectares) in Hisar, Haryana, revealed deformities in the growth of some pea plants. Approximately 10% of these plants exhibited a distinct bushy appearance, accompanied by phyllody and witches’-br

Physalis virginiana as a Wild Field Host of Bactericera cockerelli (Hemiptera: Triozidae) and ‘Candidatus Liberibacter solanacearum’

Citation
Delgado-Luna et al. (2024). Plant Disease 108 (1)
Names
“Liberibacter solanacearum”
Abstract
The potato/tomato psyllid, Bactericera cockerelli (Šulc), is among the most important pests of solanaceous crops as a vector of the pathogen ‘Candidatus Liberibacter solanacearum’ (Lso). Lso-infected psyllids often arrive in crop fields from various wild species of Solanaceae and Convolvulaceae, especially those that provide early-season hosts for the vector. Physalis species are perennial plants within the family Solanaceae with often broad geographical distributions that overlap those of B. c

An inhibitor-monitorable single-tube duplex quantitative real-time PCR assay for the detection of Candidatus Liberibacter asiaticus

Citation
Huang et al. (2023). Plant Disease
Names
Ca. Liberibacter asiaticus
Abstract
Huanglongbing (HLB) is a citrus infectious disease caused by Candidatus Liberibacters spp. Recently, it has begun to spread rapidly worldwide, causing significant losses to the citrus industry. Early diagnosis of HLB relies on quantitative real-time PCR assays. However, the PCR inhibitors found in the nucleic acid extracted from plant materials pose challenges for PCR assays because they may result in false-negative results. Internal standard (IS) can be introduced to establish a single-tube du