Tropical Plant Pathology (2020) 45, 84-90

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Tadeu A. Souza, Mônica A. Macedo, Leonardo C. Albuquerque and Alice K. Inoue-Nagata (2020)
Host range and natural infection of Tomato chlorosis virus in weeds collected in Central Brazil
Tropical Plant Pathology 45 (1), 84-90
Abstract: Tomato chlorosis virus (ToCV), transmitted by whiteflies, is an important virus that infect tomato plants worldwide. The incidence of ToCV in tomato crops in Brazil is usually high, especially in the Distrito Federal and the state of Goiás, in the central part of the country. We conducted a survey in central Brazil to detect natural infections of ToCV in weeds near tomato plants with typical criniviral symptoms to determine the possible causes of its high incidence. We also conducted an experimental host range study using a Brazilian ToCV isolate, ToCV-BR. ToCV was only detected in three out of 19 weed species collected under natural conditions: Solanum americanum, Nicandra physalodes and Amaranthus viridis. Although these species are the most important weeds, occurring at high frequencies associated with tomato crops in Brazil, the number of weed species infected by ToCV was low in the vicinity of tomato fields. In experimental trials of whitefly (Bemisia tabaci) transmission, the ToCV-BR isolate infected 10 out of 50 plant species tested. The natural abundance of both whiteflies and ToCV-susceptible plants in the field throughout the year may affect the incidence of ToCV in tomato in central Brazil.
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Database assignments for author(s): Alice Kazuko Inoue-Nagata

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Solanum americanum (weed) Brazil (south)
Amaranthus viridis (weed) Brazil (south)
Tomato chlorosis virus Tomato (Solanum lycopersicum) Brazil (south)
Nicandra physalodes (weed) Brazil (south)