The movement and infection of disease agents, for example thrips transmit tospoviruses and cause new infections throughout a greenhouse crop. The University of Maryland is the land grant institution in Maryland and is home for the Cooperative Extension Service. With extensive educational and scientific research programs the Service provides growers and other citizens of Maryland current horticultural advice and training through such programs as Total Plant Management, Master Gardeners and the Home and Garden Information Center. Aphids, nematodes, thrips and whiteflies are common vectors of plant viruses. Only thrips vector tospovirus.
Weeds are often virus reservoirs.
Also called chlorotic rings. The conductive system in plants, comprised of xylem and phloem, in which water and nutrients move.