Research
Melcast results for 2004
ISU Horticulture Farm (Gilbert, IA)
The
severity of anthracnose was estimated on the basis of percentage of leaf area
exhibiting disease. The Melcast disease warning system suggested only one spray during the season for the on-site
weather data, the remote-estimated weather data (SkyBit, Inc.), and corrected
SkyBit data. For weekly and
bi-weekly spray schedules there were 3 or 6 sprays throughout the summer.
There were two applications for treatments using Melcast, indicating
that the Melcast system used with any source of weather data saved several
sprays. Compared to the
non-sprayed control, all treatments had significantly lower disease.
However, this did not result in an increase in the number or weight of
marketable melons.
|
|
Rate
|
Spray
|
Number
of
|
%
|
#
of marketable
|
Marketable
|
Treatment
|
per
A |
frequency |
Sprays |
Disease |
melons
(/ plot) z |
Yield
(lb/plot) z |
|
Non-treated
control |
--- |
--- |
0 |
23.3
a |
16.5 |
42.0 |
|
Bravo
Ultrex 82.5WG |
1.8
lb |
Melcast
y |
2 |
2.3
c |
16.5 |
41.3 |
|
Bravo
Ultrex 82.5WG |
1.8
lb |
Melcast
x |
2 |
3.0
c |
17.5 |
44.9 |
|
Bravo
Ultrex 82.5WG |
1.8
lb |
Melcast
w |
2 |
9.0
bc |
20.5 |
50.5 |
|
Serenade
WP |
8.0
lb |
7-day |
6 |
6.8
bc |
17.0 |
42.2 |
|
Kaligreen
82 WP |
4.0
lb |
7-day |
6 |
13.8
b |
20.5 |
51.0 |
|
Bravo
Ultrex 82.5WG |
1.8
lb |
7-day |
6 |
8.0
bc |
17.5 |
48.1 |
|
Bravo
Ultrex 82.5WG |
1.8
lb |
14-day |
3 |
7.1
bc |
16.8 |
42.5 |
|
LSD
(0.05)v |
|
|
|
7.5 |
n.s. |
n.s. |
z
Values
calculated from four 25-ft. plots
y
Using
on-site weather data
x
Using SkyBit weather estimates
w
Using corrected SkyBit weather estimates modified
with CART (Kim, K.-S. et al., Plant Disease 86:179-185).
v
Means followed by identical letter are not statistically different according to
Fisher's protected least significant difference when P=0.05.