Mark Meckes
30th September 2005, 06:25 PM
From dpvweb.net - How are viruses transmitted? (http://www.dpvweb.net/intro/index.php#transmit)
... plant cells have a robust cell wall and viruses cannot penetrate them unaided. Most plant viruses are therefore transmitted by a vector organism that feeds on the plant or (in some diseases) are introduced through wounds made, for example, during cultural operations (e.g. pruning). A small number of viruses can be transmitted through pollen to the seed (e.g. Barley stripe mosaic virus, genus Hordeivirus) while many that cause systemic infections accumulate in vegetatively-propagated crops.
The major vectors of plant viruses are: Insects
This forms the largest and most significant vector group and particularly includes:
Aphids
Whiteflies
Hoppers
Thrips
Beetles
Mites
Nematodes: these are root-feeding parasites
Plasmodiophorids: these are root-infecting obligate parasite
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From dpvweb.net ... Potexvirus group (http://www.dpvweb.net/dpv/showdpv.php?dpvno=200) (Bamboo mosaic BaMv is in this group)
Association with Vectors ...
Most of the definitive potexviruses are not transmitted by vectors. Transmission of PVX by grasshoppers, probably mechanically on the insect’s mouthparts (Schmutterer, 1961), and by the fungus Synchytrium endobioticum (Nienhaus & Stille, 1965), has been reported. Goth (1962) found a low proportion of aphids transmitting WC1MV. Some possible members are transmitted by aphids, and some of these only in the presence of a helper virus.
Ecology
Potexviruses are usually highly infectious and are spread by mechanical contact, and especially with horticultural or agricultural equipment. Dissemination over wide distances occurs in infected planting material; it is aided by the vegetative propagation of the majority of the natural host plants that are grown commercially. Virus overwintering in weeds may serve as inoculum in some instances.
... plant cells have a robust cell wall and viruses cannot penetrate them unaided. Most plant viruses are therefore transmitted by a vector organism that feeds on the plant or (in some diseases) are introduced through wounds made, for example, during cultural operations (e.g. pruning). A small number of viruses can be transmitted through pollen to the seed (e.g. Barley stripe mosaic virus, genus Hordeivirus) while many that cause systemic infections accumulate in vegetatively-propagated crops.
The major vectors of plant viruses are: Insects
This forms the largest and most significant vector group and particularly includes:
Aphids
Whiteflies
Hoppers
Thrips
Beetles
Mites
Nematodes: these are root-feeding parasites
Plasmodiophorids: these are root-infecting obligate parasite
----------------
From dpvweb.net ... Potexvirus group (http://www.dpvweb.net/dpv/showdpv.php?dpvno=200) (Bamboo mosaic BaMv is in this group)
Association with Vectors ...
Most of the definitive potexviruses are not transmitted by vectors. Transmission of PVX by grasshoppers, probably mechanically on the insect’s mouthparts (Schmutterer, 1961), and by the fungus Synchytrium endobioticum (Nienhaus & Stille, 1965), has been reported. Goth (1962) found a low proportion of aphids transmitting WC1MV. Some possible members are transmitted by aphids, and some of these only in the presence of a helper virus.
Ecology
Potexviruses are usually highly infectious and are spread by mechanical contact, and especially with horticultural or agricultural equipment. Dissemination over wide distances occurs in infected planting material; it is aided by the vegetative propagation of the majority of the natural host plants that are grown commercially. Virus overwintering in weeds may serve as inoculum in some instances.