The heteroecious lifecycle ( which is mainly linked to consumption of angiosperms and represents 10 % of all aphids ) is believed to have evolved from the ancestral autoecious form ( on conifers ); this is believed to have reverted to the ancestral form in some species that were once heteroecious.
12.
The heteroecious lifecycle ( which is mainly linked to consumption of angiosperms and represents 10 % of all aphids ) is believed to have evolved from the ancestral autoecious form ( on conifers ); this is believed to have reverted to the ancestral form in some species that were once heteroecious.
13.
Similar galls are produced by other aphids : on Sitka spruce, by the Cooley spruce gall adelgid, " Gilletteela cooleyi ", some generations of which migrate to Douglas fir ( " Pseudotsuga taxifolia " ); and on spruce by " Cnaphalodes sp " ., which is heteroecious with larch.
14.
While the predominant hypothesis is that " H . vastatrix " is heteroecious, completing its life cycle on an alternate host plant which has not yet been found, an alternative hypothesis is that " H . vastatrix " actually represents an early-diverging autoecious rust, in which the teliospores are non-functional and vestigial, and the sexual life cycle is completed by the urediniospores.
15.
In macrocyclic and demicyclic life cycles, the rust may be either host alternating ( heteroecious ), i . e ., the aecial state is on one kind of plant but the telial state on a different and unrelated plant, or non-host alternating ( autoecious ), i . e ., the aecial and telial states on the same kind of plant . "'Heteroecious "'rust fungi require two unrelated hosts to complete their life cycle, with the primary host being infected by aeciospores and the alternate host being infected with basidiospores.
16.
In macrocyclic and demicyclic life cycles, the rust may be either host alternating ( heteroecious ), i . e ., the aecial state is on one kind of plant but the telial state on a different and unrelated plant, or non-host alternating ( autoecious ), i . e ., the aecial and telial states on the same kind of plant . "'Heteroecious "'rust fungi require two unrelated hosts to complete their life cycle, with the primary host being infected by aeciospores and the alternate host being infected with basidiospores.
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