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Bacterial leaf spot Pseudomonas caricapapayae: Bacterial wilt Pseudomonas solanacearum: Papaya Bunchy Top Disease: Rickettsia: Erwinia decline Erwinia sp. Erwinia mushy canker Erwinia sp. Internal yellowing Enterobacter cloacae: Purple stain Erwinia herbicola
Papaya is the only known host of the disease. [5] Symptoms typically appear around 30 to 45 days after infection. [5] Early symptoms are chlorosis and stunting of young leaves, accompanied by internode and petiole elongation. [4] As the disease progresses petioles and leaves become rigid and thickened. [4]
Papaya leaf curl virus PaLCuV causes severe disease in papaya ( Carica papaya ), but can sometimes infect other crops such as tobacco or tomato . [ 1 ] It can be found in tropical and subtropical regions primarily in India , but closely related species have also been detected in countries such as China , Malaysia , Nigeria and South Korea . [ 2 ]
The pathogen can survive in the seed of infected papaya, even after drying, for approximately 30 days (Obrero 1980). Thus far, seed-borne transmission is the predominant method of spread and infection; in fact, studies indicate the pathogen has the ability for long-range dispersal via seed (Ramachandran et al. 2015). Although symptoms can be ...
It is responsible for the black spot disease on papaya trees. It affects generally leaves and fruits at any time. It affects generally leaves and fruits at any time. Sporodochia of Asperisporium caricae was growing under side of leaf, dark blackish brown to black, stroma well-developed, erumpent .
Phytophthora root rot of papaya seedlings is most serious during rainy periods. Under waterlogged conditions, P. palmivora may attack roots of papaya older than three-months of age, the time at which they become resistant to the pathogen under normal conditions. Therefore, Phytophthora root rot may occur on papaya at any age in poorly drained ...
A phytoplasma infection often triggers leaf yellowing, probably due to the presence of phytoplasma cells in the phloem, which can affect phloem function and carbohydrate transport, [12] inhibit chlorophyll biosynthesis, and trigger chlorophyll breakdown. [6]
Papaya ringspot virus (PRSV) is a pathogenic plant virus [1] in the genus Potyvirus and the virus family Potyviridae which primarily infects the papaya tree. The virus is a non-enveloped, flexuous rod-shaped particle that is between 760–800 nm long and 12 nm in diameter.
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