FLAX (Linum usitatissimum AC Watson, S. Halley and J. Lukach
Omega, Rahab 94, and Webster)
Pasmo; Septoria linicola
Flax
cultivar response to fungicide application for the control of pasmo disease,
2002.
Four cultivars, AC Watson, Omega, Rahab 94, and Webster, were selected
for evaluation in a field at the
Pasmo disease progressed up the plant at progressively different rates
among cultivars. Differences in yield among cultivars were measured. Rahab 94
and AC Watson produced greater yields than Webster and Omega. The cultivar
Omega had stand reduction that reduced yield. This was likely associated with
defect of seed coat allowing disease to reduce stand specific to yellow seed
colored cultivars. All planting rates were based on pure live seed, determined
by in vitro blotter paper test. Yield was positively affected by the fungicide
application of Quadris. Quadris significantly increased yield over the
untreated, Ronilan, and Sulfur. Other fungicide applications were not
different from the untreated.
Cultivar
or Fungicide |
Pasmo |
Plant |
Pasmo |
Pasmo |
Yield |
|
|
|
Progression |
Height |
Progression |
Progression |
|
|
|
19
July |
|
Index |
27
July |
|
rate/acre |
inches |
inches |
|
inches |
bu/ac |
|
|
|
|
|
|
|
|
Cultivar averaged
across fungicides |
|
|
|
|
||
|
|
|
|
|
||
AC Watson
... |
9.2 |
17.1 |
53.5 |
14.2 |
10.3 |
|
Omega
.. |
6.0 |
16.2 |
37.3 |
11.9 |
3.9 |
|
Rahab 94
.. |
9.4 |
16.8 |
56.6 |
13.4 |
10.4 |
|
Webster
|
8.9 |
18.6 |
47.8 |
13.4 |
4.9 |
|
|
|
|
|
|
|
|
Fungicide
averaged across cultivars |
|
|
|
|
||
|
|
|
|
|
||
Untreated
..... |
8.9 |
17.3 |
51.2 |
14.3 |
7.0 |
|
AMS 21619 480 SC 5.7
fl oz .. |
8.6 |
16.9 |
50.8 |
13.3 |
7.9 |
|
Quadris 2.08 SC 9.6
fl oz.
... |
8.1 |
17.6 |
46.7 |
12.9 |
9.6 |
|
Ronilan 50 EG 12 fl
oz
|
8.1 |
16.8 |
48.0 |
12.9 |
5.5 |
|
Sulfur 80W 5 lb
... |
8.1 |
17.1 |
47.0 |
12.5 |
6.9 |
|
|
|
|
|
|
|
|
Cult |
LSD |
0.9 |
1.0 |
5.1 |
1.5* |
1.6 |
Fung |
LSD |
NS |
NS |
NS |
NS |
1.7 |
C. V. % |
|
17 |
9 |
17 |
18 |
33 |
* Significant at 0.1 probability level for mean comparisons.