Author/Authors :
E. K. CHATZIVASSILIOU، نويسنده , , D. PETERS and N. I. KATIS، نويسنده ,
Abstract :
Oviposition of Thrips tabaci, larval development and
their potential to acquire Tomato spotted wilt virus
(TSWV) from infected Amaranthus retroflexus, Datura
stramonium, Lactuca serriola, Solanum nigrum and
Sonchus oleraceus plants and the ability of the adults
to transmit this virus to these weeds and tobacco (Nicotiana
tabacum cv. Basmas) were studied. When a
T. tabaci female was given an oviposition period of
4 days, an average of 21 larvae were produced on
leaves of D. stramonium, 17.5 on S. nigrum, 16.3 on
L. serriola and 14.3 on S. oleraceus. Significantly
higher numbers of larvae were found on tobacco
(29.5), and lower numbers on A. retroflexus (1.9). In a
choice test, when females were placed onto leaves
of these weed species and tobacco in a Petri dish,
D. stramonium was preferred over tobacco. Equal
numbers of larvae emerged on leaves of tobacco, of
L. serriola and of S. nigrum. Oviposition was lower on
A. retroflexus and S. oleraceus in this test. After the
transfer of newborn 24 h old larvae to leaf discs of
tobacco or to one of the weeds 87, 84, 82, 71, 64 and
17% became pupa on tobacco, D. stramonium,
L. serriola, S. nigrum, A. retroflexus or S. oleraceus
respectively. After acquisition of virus by newborn-
24 h old larvae from L. serriola, D. stramonium,
S. nigrum and A. retroflexus 69.5, 51.4, 32.6 and 22%
of the adults became transmitters. No transmission
could be recorded on S. oleraceus due to a high larval
mortality. Males appeared to be more efficient transmitters
than females. Tobacco was more susceptible
to TSWV than petunia and the weed species,
while among weeds, S. nigrum was the most and
A. retroflexus the least susceptible species
Keywords :
larval development , oviposition , Thripidae , Tobacco thrips , transmission efficiency , tospoviruses
