Kulturtechnische Verfahren zur Regulation von Virusvektoren in Pflanzkartoffeln (PVY). (00UM024)

Details zum Projekt
Projektlaufzeit: 03/200112/2003


Potato virus Y (PVY) is transmitted non-persistently by winged morphs of
many aphid species and is a major problem in seed potato production. In
order to evaluate the potential of straw mulch applications (4-5 t
ha-1) and presprouting on PVY reduction, small scale organically managed
field experiments were carried out in Northern Hessen, Germany, over 3
yr. In all years mulching significantly reduced aphid infestation on
leaves as well as PVY incidence in tubers. For the effect of
presprouting the temporal coincidence of two factors was crucial crop emergence and aphid flight activity.
decreased PVY incidence when in the phase of early crop emergence aphid
spring flight activity was low, but increased it, although not
significantly, when prominent aphid flight peaks occurred in this
critical period. Straw mulch was most effective when vector pressure was
concentrated early in the year acting as a PVY protectant for young
plants. In later growth stages its effect declined gradually with
increasing ground coverage of the crop. Combined mulching and
presprouting had a synergistic, complementary effect on reduction of PVY
incidence. In an on-farm experiment in 2001 scaling up
the area mulched stepwise from 100 m² to 900 m² consistently kept aphid infestation at reduced levels.

Zuletzt aktualisiert 2017-27-10 um 10:43