Role of Aphids in the Ecology of Plant Viruses

摘要: Ecology attempts, among other things, to account for the numbers and spatial distribution of organisms. The ecology viruses has usually been considered in terms number infected hosts (22, 114, 122). Although cannot be regarded as small cells or micro­ organisms (85) , like parasites, they must maintain their populations by a dependable means transfer susceptible hosts. continued sur­ vival virus requires that sources shall never fall so low becomes unlikely (22). characteristics permit enhance natural are thus undoubtedly subject selective pressures. relationships with its vectors ensure necessary frequency transfers. Vectors have consistent relationship host plants, although it may only matter alighting one another noncolonizing species during migration. It is not surprising, therefore, many aphid-borne. Most angiosperms gymno­ sperms, some lower plants such ferns, Northern Temperate Zone at least aphid species. enormous reproductive potential behavioral patterns aphids wide dispersal plants. aphid-borne reflect activity vectors. There added condition extent which important depends on available. Under conditions agricultural situations, these transmission previous years.