Agriculture Reference
In-Depth Information
compared to variant 2. Because of leaf damages caused by
C. beticola
Sacc. sugar yield on
the control was decreased by 21.14% compared to the variant with one fungicide application
and by 30.67% compared to the variant with three fungicide applications. Higher losses due
to disease development were expected during the humid year 2010 and smaller in the
remaining two dry years.
The lowest sugar yield on treatments without fungicide application in three-years average
was achieved with hybrids Elvis, Belinda, Gazeta and Giraf. The pure sugar yield increase
with three fungicide applications was lowest with hybrid Elvis (2.0 t ha
-1
), then Belinda and
Giraf (3.4 t ha
-1
) and highest with hybrid Gazete (3.8 t ha
-1
), what shows that the effectiveness
of fungicide application is not dependent on declared tolerance to
C. beticola
Sacc.
Analysis of Sugar Beet Leaf Damage Caused by the Attack of Cercospora beticola Sacc
The intensity of sugar beet leaf damage caused by
C. beticola
Sacc. depended on the
number of fungicide applications, hybrid and year of research. In average, the sugar beet leaf
damage, during all the three years of research, caused by
C. beticola
Sacc
.
was relatively high
and ranged up to 2.67 (Table 6).
Table 6. Analysis of sugar beet leaf damage caused by the attack
of Cercospora beticola Sacc
Hybrid (A)
Variant (B)
Year (C)
Average
2010
2011
2012
Belinda
1
4.75
4.25
4.15
4.38
2
3.56
3.38
3.45
3.46
3
1.75
1.42
1.12
1.43
Average
3.35
3.02
2.91
3.09
Colonia KWS
1
4.10
3.60
3.13
3.61
2
2.70
2.50
2.63
2.61
3
0.75
0.43
0.50
0.56
Average
2.52
2.18
2.09
2.26
Elvis
1
4.50
4.10
4.24
4.28
2
3.84
3.10
3.25
3.40
3
2.54
1.52
1.63
1.90
Average
3.63
2.91
3.04
3.19
Sandor
1
5.00
4.00
4.30
4.43
2
3.10
3.13
3.10
3.11
3
0.62
0.83
0.75
0.74
Average
2.91
2.65
2.72
2.76
Boomerang
1
4.75
4.23
4.00
4.33
2
3.16
2.75
2.73
2.88
3
1.10
0.86
1.10
1.02
Average
3.00
2.61
2.61
2.74
Giraf
1
5.00
4.25
4.35
4.53
2
3.95
3.55
2.78
3.43
3
2.75
1.33
1.50
1.86
Average
3.90
3.04
2.88
3.27
