By Karen S. Gibb, John W. Randles (auth.), Kerry F. Harris (eds.)
This sequence explores how vectors (carriers of ailment brokers, akin to bugs) collect, hold and to that end transmit pathogens to hosts. It covers the spectrum of vectors, together with companies of plant pathogens in addition to medically comparable pathogens. The Chapters in quantity 7 contain: 1. K. Gibb, J.W. Randles: Transmission of velvet tobacco mottle virus and comparable viruses by means of the mirid Cyrto- peltis nicotianae. 2. N. Carter, R. Harrington: elements influencing aphid inhabitants dynamics and behaviour and the implications for virus unfold. three. R.H. Bagnall: Cyclic epidemics of aphid-borne potato viruses in Northern seed-potato-growing parts. four. C.J. Andrews, R.C. Sinha: Interactions among barley yellow dwarf virus an infection and winter-stress tolerance in cereals. five. J.R. DeLoach, G. Spates: man made diets for blood feeding bugs: a assessment. 6. I. Maudlin: Transmission of African trypanosomiasis: interactions between Tsetse immune method, symbionts, and parasites. 7. C. Chastel, I. Humphery-Smith: Mosquito spiroplasmas. the 1st 4 chapters disguise themes in plant virus transmission via bugs. the ultimate 3 chapters concentrate on human and animal disorder institutions with bollid-feeding flies.
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This is particularly so because stylet-feeding rather than chewing allows the use of membrane-feeding techniques to fine-tune acquisition experiments and overcomes the problem of chewed leaf fragments being retained in the gut and affecting assay results. Further, mirids molt at regular intervals unlike beetles and mites, and are easy to manipulate. S. W. Randles results, it provides direction for further experiments, in particular, the significance of ingestion-egestion behavior in transmission and an ultrastructural study of mirid salivary glands to detect very low levels of virus.
Transmission of one strain of PVY by M. persicae was dependent on temperature, but transmission of another strain was not. M. euphorbiae, however, transmitted both strains independently of temperature. If feeding behavior is the sole cause for differences in transmission efficiency of the two strains, then transmission of both strains by M. persicae would be expected to depend on temperature. As this was not the case, other factors must control vector efficiency also. Temperature influences the spread of persistent viruses by affecting the duration of the period between acquisition of a virus by an aphid vector and the time when that vector becomes infective (latent period).
C >. - ' :5 · f .... :l. j::>. 2-m suction trap and the numbers sampled in the spring and early summer, 1966-1988. J UJ ,... "") :::l - >. 0 2. 7 9 • 10 20 30 40 50 No. of gro und f r osts in Jan. and F eb. 2. The effect of temperature during the winter on the incidence of beet yellowing viruses (angle scale) at the end of A~gust in Eastern England, 1965-1985. more risk from infection VIlith BYDV than those sown early , as they are exposed to the spring aphid migration just after emergence when they are most susceptible to damage from the disease.