Tospoviruses of Tomato and Management. Shouan Zhang Associate Professor Tropical Research and Education Center University of Florida, IFAS
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1 Tospoviruses of Tomato and Management Shouan Zhang Associate Professor Tropical Research and Education Center University of Florida, IFAS Workshop: Strategy and Practical Approaches to Managing Vegetable Pests. UF/IFAS M-D Extension. January 7, 2015
2 Tospoviruses Genus: Tospovirus Family: Bunyaviridae Origin: Tospovirus derived from its first member Tomato spotted wilt virus (TSWV)
3 Tospoviruses in US Tomato spotted wilt virus (TSWV) Impatiens necrotic spot virus (INSV) Iris yellow spot virus (IYSV) Groundnut ringspot virus (GRSV) Tomato chlorotic spot virus (TCSV) 2012 The genomes of TCSV, GRSV are analogous to TWSV
4 Tomato spotted wilt virus (TSWV)
5 Groundnut ringspot virus (GRSV)
6 Tomato chlorotic spot virus (TCSV)
7 Geographic Distribution TSWV is widespread in eastern US states GRSV not prevalent outside of south FL - found in SC, NY TCSV only found in south FL - Webster et al. 2014
8 Outbreak in Homestead Fall 2014 Average 5-10% plants infected Some fields up to 30%
9 Fall 2014 in Homestead Local and systemic infection - necrosis - stunting Started about 3 weeks after transplanting
10 TCSV Predominates in Homestead All tomato samples submitted in fall 2014 were infected with Tomato chlorotic spot virus (TCSV). TCSV is the newest of the three tospoviruses infecting tomatoes in Florida (reported in 2012), and it has been the predominant one detected in the Homestead area for the past few years. Neither Groundnut ringspot virus (GRSV) nor Tomato spotted wilt virus (TSWV) was detected from those samples. - Scott Adkins (USDA, Ft. Pierce)
11 TCSV First reported from south Florida on tomato, pepper (Londono et al. 2012) Vectors: - western flower thrips (Frankliniella occidentalis) widespread in US and FL - common blossom thrips (F. schultzei) less frequent in US, but found recently in cucurbits and solanaceous crops in M-Dade County (Kakkar et al. 2012)
12 Other Thrips Species? Florida flower thrips (F. bispinosa) tobacco trips (F. fusca) - commonly present in southeastern US - known to transmit tospoviruses Webster et al. (2014) - Neither was observed to transmit GRSV - TCSV? Unknown, need further studies
13 Host Range Experimentally - primarily solanaceous species: (except underlined) Vegetables: tomato, pepper, tomatillo, eggplant, lettuce Ornamentals: tobacco, petunia, impatiens Weeds: Jimsonweed - Not clear, need further investigations
14 Field Observations 12/10/2014 More serious in areas close to - squash, bean fields - fruit grove with abundant weeds
15 Thrips Populations Thrips - F. occidentalis - F. schultzai Several hundreds tomato (and a few weed) samples collected in Homestead - Populations of both thrips species low - No or few larvae found in tomato flowers Dak Seal - Dec. 2014
16 Further Research Host range: any other vegetables, ornamentals, fruit trees, weeds? Vectors: other thrips species? reproduction Symptoms: time after inoculation (thrips feeding) days (Polston) Source, transmission, transplants
17 Integrated Management (e. g. TSWV NFREC) Select resistant variety (Sw5 gene) Remove weed reservoirs from around production area Exclude thrips from transplant production Use UV reflective mulch to repel thrips Apply Actigard (acibenzolar-s-methyl) to reduce symptom expression
18 Apply insecticides to limit secondary virus spread. Destroy crops promptly after harvest Cooperation is KEY to success!
19 Trials at TREC Being planned in spring Variety screening for resistance (Sw5 gene) - Insecticide for control of thrips Need Your SUPPORT! Sanibel transplants (late January) - Support letters for a proposal on tomato TCSV management to FDACS SCBG in February
20 References Londoño, A., H. Capobianco, S. Zhang, and J. E. Polston "First Record of Tomato Chlorotic Spot Virus in the U.S." Tropical Plant Pathology 37: UF/IFAS PP306 Tomato Chlorotic Spot Virus ( UF/IFAS ENY859 Managing Thrips and Tospoviruses in Tomato (
21 Thank you! Shouan Zhang TREC, UF/IFAS x 213
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