Abstract
The common five weed species Datura stramonium L., Solanum nigrum L., Brassica kaber (DC), Capsella bursapastoris L. and Malva parviflora L., were tested for their susceptibility to an isolate of TYLCSV from Murcia, Spain (TYLCSV-ES), using the B-, Q- and S-biotypes of Bemisia tabaci (Gennadius). Both, B- and Q-biotypes were shown to transmit TYLCSV-ES from infected tomato to S. nigrum and D. stramonium and vice versa. Transmission efficiency from tomato to these weeds varied from 58.3% to 83.3%. Transmission efficiency from the infected weeds back to tomato varied from 66.7% to 100%. No significant difference between the B- and Q-biotypes was found in transmission efficiency from infected tomato to weed plants and from D. stramonium back to tomato. However, a significant difference in transmission efficiency from infected S. nigrum plants to tomato was detected between the B- and Qbiotypes. No other tested weed species were found to be infected by or host TYLCSV-ES. The S-biotype was unable to survive on tomato long enough to acquire or transmit TYLCSV-ES and could only transmit the virus from S. nigrum to S. nigrum at a very low efficiency. The implications of these results for the epidemiology of TYLCV´s in the field are discussed.
Highlights
Since some of common weeds are already known to be susceptible to some TYLCV’s [S. nigrum to TYLCSVAL (Bedford et al, 1998) and D. stramonium to TYLCV (Cohen and Nitzany, 1966)], it is possible that they may serve as reservoirs of TYLCSV-ES and play a significant role in the epidemiology of this virus in the field
Some differences in transmission efficiencies of the B. tabaci biotypes when transmitting TYLCV/TYLCSV from tomato to tomato have been already reported (Sánchez-Campos et al, 1999), but few experimental studies had been undertaken to date on the transmission of TYLCSV-ES (SánchezCampos et al, 2000)
Plants of D. stramonium, S. nigrum, B. kaber, C. bursa-pastoris and M. parviflora were grown in an insect-virus free chamber at 26 ± 1°C for 3-4 weeks and tested as hosts of TYLCSV as described below
Summary
Se analizó la susceptibilidad de las malas hierbas Datura stramonium L., Solanum nigrum L., Brassica kaber (DC), Capsella bursa-pastoris L. and Malva parviflora L. a un aislado del TYLCSV procedente de Murcia, España (TYLCSVES), utilizando como vectores los biotipos B, Q y S de Bemisia tabaci (Gennadius). Muñiz (2000) and Nombela et al (2001) have reported differences between the host responses to B- and Q-biotypes of B. tabaci in common weeds (Datura stramonium L., Solanum nigrum, L., Brassica kaber (DC), Capsella bursa-pastoris L. and Malva parviflora L.) and tomato plants.
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