scholarly journals Evaluation of several insecticides for residual insecticidal activity against adult Thrips tabaci Lindeman and inhibition of Iris yellow spot virus (IYSV) transmission.

2010 ◽  
Vol 76 (4) ◽  
pp. 269-274
Author(s):  
S. ZEN ◽  
M. OKUDA ◽  
S. FUJI
Keyword(s):  
Insecticidal Activity ◽  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
Spot Virus

scholarly journals Transmission of Iris Yellow Spot Virus by Frankliniella fusca and Thrips tabaci (Thysanoptera: Thripidae)

2012 ◽  
Vol 105 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Rajagopalbabu Srinivasan ◽  
Sivamani Sundaraj ◽  
Hanu R. Pappu ◽  
Stan Diffie ◽  
David G. Riley ◽  
...  
Keyword(s):  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
Spot Virus ◽  
Frankliniella Fusca

scholarly journals Distribution and Transmission of Iris yellow spot virus

Plant Disease ◽  
2001 ◽  
Vol 85 (8) ◽  
pp. 838-842 ◽  
Author(s):  
A. Kritzman ◽  
M. Lampel ◽  
B. Raccah ◽  
A. Gera
Keyword(s):  
Frankliniella Occidentalis ◽  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
Onion Thrips ◽  
Spot Virus ◽  
Nucleocapsid Gene ◽  
Thrips Species ◽  
Mother Plants ◽  
Thrips Population

Iris yellow spot virus (IYSV), a new tospovirus associated with a disease in onion (Allium cepa) that is known to growers in Israel as “straw bleaching,” was identified and further characterized by host range, serology, electron microscopy, and molecular analysis of the nucleocapsid gene. The transmissibility of IYSV by Thrips tabaci and Frankliniella occidentalis was studied. IYSV was efficiently transmitted by T. tabaci from infected to healthy onion seedlings and leaf pieces. Two biotypes of F. occidentalis, collected from two different locations in Israel, failed to transmit the virus. Surveys to relate the incidence of thrips populations to that of IYSV were conducted in onion fields. They revealed that the onion thrips T. tabaci was the predominant thrips species, and that its incidence was strongly related to that of IYSV. Forty-five percent of the thrips population collected from IYSV-infected onion and garlic fields in Israel transmitted the virus. IYSV was not transmitted to onion seedlings from infected mother plants through the seed, and was not located in bulbs of infected plants.

scholarly journals First Report of Iris yellow spot virus in Onion in Mauritius

Plant Disease ◽  
2010 ◽  
Vol 94 (11) ◽  
pp. 1373-1373 ◽  
Author(s):  
K. Lobin ◽  
A. Saison ◽  
B. Hostachy ◽  
S. P. Benimadhu ◽  
H. R. Pappu
Keyword(s):  
Disease Incidence ◽  
Consensus Sequence ◽  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
N Gene ◽  
Spot Virus ◽  
Viral Pathogen ◽  
First Report ◽  
Das Elisa

Iris yellow spot virus (IYSV; family Bunyaviridae, genus Tospovirus) transmitted by thrips (Thrips tabaci Lindeman) is an economically important viral pathogen of bulb and seed onion (Allium cepa) crops in many onion-growing areas of the world (2,3). In Africa, IYSV has been reported in Reunion (4) and South Africa (1). In June 2008, diamond-shaped lesions that are typical of IYSV were observed on onion seed scapes in an onion plot of 0.25 ha at Reduit in the central part of Mauritius. Disease incidence was 80% with a severity of 50 to 75% of the scape surface area. Lodging was observed in 25% of the symptomatic plants. Twenty-two symptomatic plants were tested and found to be positive for IYSV when tested by double antibody sandwich (DAS)-ELISA with a commercially available kit (Agdia Inc., Elkhart, IN). The presence of the virus was confirmed by reverse transcription (RT)-PCR tests with primers 917L: 5′-TAAAACTTAACTAACACAAA-3′ and 56U: 5′-TCCTAAGTATTCACCAT-3′ as forward and reverse primers, respectively, for specific sequences flanking the CP gene. Another set of primers specific to the small (S) RNA of IYSV (5′-TAAAACAAACATTCAAACAA-3′ and 5′-CTCTTAAACACATTT AACAAGCAC-3′) produced an amplicon of approximately 1.2 kb that includes the 772-bp nucleocapsid (N) gene. The 1.2-kb amplicon was cloned and four clones were sequenced and consensus sequence was used for comparisons. Sequence analysis showed that the N gene of the IYSV isolate from Mauritius (GenBank Accession No. HM218822) shared the highest nucleotide sequence identity (99%) with several known IYSV N gene sequences (Accession Nos. FJ785835 and AM900393) available in the GenBank, confirming the presence of IYSV in the onion crops in Mauritius. A survey was subsequently carried out from July to November 2008 in major onion-growing localities at La Marie, Henrietta, Reduit, and Plaine Sophie (center); Bassin, La Ferme, and La Chaumiere (west); Grand Sable, Petit Sable, and Plaisance (south, southeast); and Belle Mare, Trou d'Eau Douce, and Palmar (east) to monitor the distribution of the disease on the island. Symptomatic samples with diamond-to-irregularly shaped lesions were observed and 155 symptomatic and 35 nonsymptomatic samples were collected and screened by DAS-ELISA for IYSV and Tomato spotted wilt virus (TSWV), another tospovirus reported to infect onion elsewhere. Sixty-six percent of the symptomatic samples screened (102 of 155) tested positive for IYSV. No IYSV was detected in the symptomless samples. There was no serological indication of TSWV infection in the samples. Samples that tested positive for IYSV were collected from Belle mare, Palmar, and Trou d'eau douce in the east and La Ferme in the west. Cultivars infected were Gandiole, Local Red, and Veronique. No IYSV was detected in the bulbs. The vector, T. tabaci, was observed in infected onion parcels surveyed and is known to occur in all onion-producing areas of the island. To our knowledge, this is the first report of IYSV in onion in Mauritius. Further surveys and monitoring of IYSV incidence, along with its impact on the yield, need to be established. References: (1) L. J. du Toit et al. Plant Dis. 91:1203, 2007. (2) D. H. Gent et al. Plant Dis. 88:446, 2004. (3) H. R. Pappu et al. Virus Res. 141:219, 2009. (4) I. Robène-Soustrade et al. Plant Pathol. 55:288, 2006.

scholarly journals First Report of Vidalia Onion (Allium cepa) Naturally Infected with Tomato spotted wilt virus and Iris yellow spot virus (Family Bunyaviridae, Genus Tospovirus) in Georgia

Plant Disease ◽  
2004 ◽  
Vol 88 (11) ◽  
pp. 1285-1285 ◽  
Author(s):  
S. W. Mullis ◽  
D. B. Langston ◽  
R. D. Gitaitis ◽  
J. L. Sherwood ◽  
A. C. Csinos ◽  
...  
Keyword(s):  
Tomato Spotted Wilt Virus ◽  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
Unknown Etiology ◽  
Enzyme Linked Immunosorbent Assay ◽  
Rt Pcr ◽  
Spot Virus ◽  
Tomato Spotted Wilt ◽  
Wilt Virus

Vidalia onion is an important crop in Georgia's agriculture with worldwide recognition as a specialty vegetable. Vidalia onions are shortday, Granex-type sweet onions grown within a specific area of southeastern Georgia. Tomato spotted wilt virus (TSWV) has been endemic to Georgia crops for the past decade, but has gone undetected in Vidalia onions. Tobacco thrips (Frankliniella fusca) and Western flower thrips (Frankliniella occidentalis) are the primary vectors for TSWV in this region, and a number of plant species serve as reproductive reservoirs for the vector or virus. Iris yellow spot virus (IYSV), an emerging tospovirus that is potentially a devastating pathogen of onion, has been reported in many locations in the western United States (2,4). Thrips tabaci is the known vector for IYSV, but it is unknown if noncrop plants play a role in its epidemiology in Georgia. During October 2003, a small (n = 12) sampling of onions with chlorosis and dieback of unknown etiology from the Vidalia region was screened for a variety of viruses, and TSWV and IYSV infections were serologically detected. Since that time, leaf and bulb tissues from 4,424 onion samples were screened for TSWV and IYSV using double antibody sandwich-enzyme linked immunosorbent assay (DAS-ELISA) with commercial kits (Agdia Inc., Elkhart, IN). Samples were collected from 53 locations in the Vidalia region during the growing season between November 2003 and March 2004. Plants exhibiting stress, such as tip dieback, necrotic lesions, chlorosis or environmental damage were selected. Of these, 306 were positive for TSWV and 396 were positive for IYSV using positive threshold absorbance of three times the average plus two standard deviations of healthy negative onion controls. Positive serological findings of the onion tissues were verified by immunocapture-reverse transcription-polymerase chain reaction (IC-RT-PCR) for TSWV (3) and RT-PCR for IYSV (1). In both instances, a region of the viral nucleocapsid (N) gene was amplified. The PCR products were analyzed with gel electrophoresis with an ethidium bromide stain in 0.8% agarose. Eighty-six percent (n = 263) of the TSWV ELISA-positive samples exhibited the expected 774-bp product and 55 percent (n = 217) of the IYSV ELISA-positive samples exhibited the expected 962-bp product. The reduced success of the IYSV verification could be attributed to the age and deteriorated condition of the samples at the time of amplification. Thrips tabaci were obtained from onion seedbeds and cull piles within the early sampling (n = 84) and screened for TSWV by the use of an indirect-ELISA to the nonstructural (NSs) protein of TSWV. Of the thrips sampled, 25 were positive in ELISA. While the incidence of IYSV and TSWV in the Vidalia onion crop has been documented, more research is needed to illuminate their potential danger to Vidalia onions. References: (1) I. Cortês et al. Phytopathology 88:1276, 1998. (2) L. J. du Toit et al. Plant Dis. 88:222, 2004. (3) R. K. Jain et al. Plant Dis. 82:900, 1998. (4) J. W. Moyer et al. (Abstr.) Phytopathology 93(suppl.):S115, 2003.

Iris yellow spot virus. [Distribution map].

2009 ◽  
Author(s):  
Keyword(s):  
New York ◽  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
Allium Porrum ◽  
Distribution Map ◽  
Spot Virus ◽  
South Wales ◽  
Virus Distribution ◽  
Distribution In Europe

Abstract A new distribution map is provided for Iris yellow spot virus, Bunyaviridae: Tospovirus. Hosts: onion (Allium cepa), Dutch iris (Iris hollandica), leek (Allium porrum) and Hippeastrum spp. Information is given on the geographical distribution in Europe (France, Mainland France, Germany, Italy, Mainland Italy, Netherlands, Poland, Serbia, Slovenia, Spain, Mainland Spain, UK, England and Wales), Asia (India, Maharashtra, Iran, Israel, Japan, Honshu, Kyushu), Africa (Reunion, South Africa, Tunisia), North America (Canada, Ontario, USA, Arizona, California, Colorado, Georgia, Idaho, Nevada, New Mexico, New York, Oregon, Texas, Utah, Washington), Central America and Caribbean (Guatemala), South America (Brazil, Pernambuco, Sao Paulo, Chile, Peru), Oceania (Australia, New South Wales, Victoria, Western Australia, New Zealand). It is vectored by Thrips tabaci (Thysanoptera: Thripidae).

scholarly journals Evaluation of Lisianthus as an Indicator Host for Iris yellow spot virus

Plant Disease ◽  
2011 ◽  
Vol 95 (12) ◽  
pp. 1520-1527 ◽  
Author(s):  
Rajagopalbabu Srinivasan ◽  
Stan Diffie ◽  
Sivamani Sundaraj ◽  
Stephen W. Mullis ◽  
David Riley ◽  
...  
Keyword(s):  
Transmission Rate ◽  
Thrips Tabaci ◽  
Iris Yellow Spot Virus ◽  
Yellow Spot ◽  
Effect Of Temperature ◽  
Enzyme Linked Immunosorbent Assay ◽  
Mechanical Transmission ◽  
Symptom Expression ◽  
Spot Virus ◽  
Temperature Regimes

Iris yellow spot virus (IYSV) can severely affect onion production. IYSV is transmitted by the onion thrips, Thrips tabaci. However, information on IYSV–thrips–onion interactions is limited due to the difficulty associated with infecting onion plants experimentally. Lisianthus (Eustoma russellianum) was used as an indicator host to study mechanical transmission of IYSV, IYSV transmission by T. tabaci, IYSV distribution in the host plant, and the effect of temperature on IYSV symptom expression. Mechanical inoculation tests from IYSV-infected onion plants to noninfected lisianthus plants resulted in a mean transmission rate of 82.5 ± 6.9% (mean ± standard error), and from IYSV-infected lisianthus plants to noninfected lisianthus plants resulted in a mean transmission rate of 89.2 ± 7.1%. T. tabaci adults transmitted IYSV at a rate of 80.0 ± 8.3% from infected onion plants to noninfected lisianthus plants. To assess IYSV distribution in infected lisianthus plants, leaf sections, stems, and roots were tested by enzyme-linked immunosorbent assay (ELISA). All the plant parts tested positive for IYSV, but not on every plant assayed. Alternating night and day temperatures of 18 and 23°C, 25 and 30°C, and 30 and 37°C were evaluated for the effects on IYSV symptom expression. More severe symptoms developed on inoculated plants incubated at the 18 and 23°C or 25 and 30°C temperature regimes than at the 30 and 37°C regime, and symptoms were observed earliest on plants incubated at the 25 and 30°C temperature regime compared to the other temperature regimes.

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