Journal article
Aspects of straw mulching in organic potatoes- II. Effects on potato virus Y, Leptinotarsa decemlineata (Say) and tuber yield



Publication Details
Authors:
Döring, T.; Heimbach, U.; Thieme, T.; Saucke, H.
Publication year:
2006
Journal:
Nachrichtenblatt- Deutschen Pflanzenschutzdienstes Braunschweig
Pages range:
93-97
Volume number:
58
ISSN:
0027-7479

Abstract
In a series of on-farm field experiments in organically grown potatoes the influence of straw mulch on the incidence of Potato virus Y (PVY), on the infestation with Colorado potato beetle (CPB, Leptinotarsa decemlineata), and on tuber yield was investigated over three years. Straw mulch significantly reduced PVY infection in three out of seventeen experiments; in seven further experiments there was a non-significant reduction of PVY. The effect of straw mulch on PVY incidence appeared to be dependent on the overall level of PVY infection, which differed between years, locations and varieties. For example, there was a consistent PVY reduction in 2002 and 2004, when the overall level of PVY infection was high. In contrast to this, no consistent trend could be observed in 2003, when there was a very low general PVY infection level. Straw mulch did not significantly affect the infestation with Colorado potato beetle in any of nine field experiments. However, in three experiments where three levels of straw were applied (nil, moderate amount and high amount), there was a consistent trend with the highest infestation in the unmulched treatment and the lowest CPB infestation at the highest amount of straw in eleven out of fifteen assessments. In five out of six field experiments there was no significant effect of straw mulch on tuber yield. Particularly, in two experiments conducted on lighter soils (loamy sand), straw mulch did not significantly affect yield or the size distribution of the tubers.

Last updated on 2018-30-04 at 09:52