Crop Insurance Today September 2017 - 14

removal at growth stages of 20, 24, or 28 nodes
on the cotton plant. The most significant loss was
associated with the treatments done at 32 nodes,
where there were losses as high as 45 percent.
There are no current NCIS charts that go to these
levels of plant growth, so this research will be
used to determine new charts for cotton grown
in this area.
A second study examined the defoliation of
the cotton plant with and without the removal
of the terminal nodes. Defoliation was done at
nodes 4, 10, 16 and 24 nodes with either 50 or
100 percent of the leaves being removed. The 50
percent defoliation treatments removed the top
50 percent of the leaves. The results from 2016
showed little difference in loss between the treatments due to defoliation. There were some numerical differences, but there were no significant
differences found.

COTTONMississippi

This study was initiated to determine the
effects of plant cutoffs to cotton specific to the
growing conditions of Mississippi and the midsouth region. The research was conducted under
rain-fed conditions and examines plant cutoffs during vegetative and reproductive stages
of growth.
The treatments were cut-offs at 4-leaf, pinhead square (R-1), first flower (R-8), and first
flower + 4 weeks) (~R12) stages of growth. This
research was conducted at both Starkville and
Brooksville, Mississippi.
The growth stage, as well as location, at which
the plant cut-offs were removed had a signifi-

Table 8 COTTON Mississippi
Treatment

Starkville

4 Leaf-2 nodes
4 Leaf-4 nodes
Pinhead-2 nodes
Pinhead-4 nodes
Pinhead-6 nodes
Pinhead-8 nodes
1st Flower-2 nodes
1st Flower-4 nodes
1st Flower-6 nodes
1st Flower-8 nodes
st
1 F + 4 Wks-2 nodes
1st F + 4 Wks-4 nodes
1st F + 4 Wks-6 nodes
1st F + 4 Wks-8 nodes

16
38
10
23
44
81
8
11
28
53
11
9
15
19

cant effect on cotton yield. The loss percentages
at Brooksville were consistently lower than the
current charts, while the losses at Starkville were
very close to the current charts for plant cut-offs
at these stages. NCIS is continuing this trial in
2017 at both locations.

POTATOESColorado

Research began in 2014 to examine the losses associated with simulated hail damage to
white potatoes: both medium and late maturing
varieties under the growing conditions in Colorado. Two different varieties, Russet Norkotah
Sel. 8 (a medium maturing variety) and Russet
Nugget (a late maturing variety) were grown
with simulated hail applied at three growth
stages: Tuber Initiation (TI), Early Bulking
(EB), and Late Bulking (LB). Damage was ap-

Brownville
Loss%

-4
4
-5
-3
-8
31
-7
4
20
35
1
7
19
31

AUGUST2017

10
25
15
25
40
60
20
30
40
40
20
30
40
60

plied at 0, 33, 66 and 95 percent. The plants were
then taken to harvest. This was the third year of
a planned three-year trial so final conclusions
will be made as we combine the results together.
Losses varied depending on the maturity of the
potatoes. The medium maturity potatoes had
slightly higher losses when compared with the
current charts for the early bulking stage while
the late maturing potatoes had losses very close
to the current charts.

POTATOESNorth Dakota

Both medium and late maturing white potato
varieties are part of a three-year, North Dakota-based research study on simulated hail damage. Two different varieties, Russet Norkotah (a
medium maturing variety) and Ranger Russet (a
late maturing variety) were grown and had sim-

Soybean research in Indiana studying the effects of 100 defoliation on soybeans at the R4 (left) and R5 (right) stages of growth.

14

Charts



Table of Contents for the Digital Edition of Crop Insurance Today September 2017

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Crop Insurance Today September 2017 - Cover2
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Crop Insurance Today September 2017 - Cover3
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