Crop Insurance Today August 2016 - 9
The removal of the terminal increased the
loss for the 50 percent defoliation treatment
to 35 percent and the 100 percent defoliation
treatment to 46 percent.
COTTONSouth Carolina
Darrin Dodds, Mississippi State University in Starkville, examines the regrowth of the cotton
plant after applying the cut-off treatment at the 4-leaf growth stage.
Table 8.
Damage
33%
66%
95%
33%
66%
95%
Tuber Initiation
Early Bulking
Medium-Russet Norkotah Sel. 8 Loss %
8
17
38
Late Bulking
14
24
37
8
6
10
14
24
51
0
5
16
Late-Russet Nugget Loss %
5
14
34
The purpose of this study was to determine the effects of defoliation on cotton
specific to the growing conditions of South
Carolina. The research was conducted under
rain fed conditions and examines defoliation
during vegetative and reproductive stages of
growth. The treatments were 50 percent and
100 percent defoliation at V-4, R-1, R-8, and
R-12 stages of growth with and without the
terminal being removed.
The growth stage at which the plant cutoffs were removed had a significant effect on
cotton yield. The loss percentages from the
terminal removal were consistently lower than
what the current charts would suggest. Defoliation seemed to be only a concern at the greatest amount of defoliation-the plants were
able to compensate quite well with 50 percent
defoliation at all stages of growth. See Table 6.
COTTONMississippi
This trial, conducted at Starkville, studied
the effects of plant cut-offs on cotton production. The treatments were cutoffs when the
plants were at V4 (four leaves); R-1 (match
head square); R-8 (first bloom); and R-12
(first boll). The treatments were to remove the
top 2, 4, 6, or 8 nodes. An example would be at
R-1, the cut-offs would occur at node 7, node
5, node 3, and node 1. The resulting losses are
shown in table 7.
POTATOESColorado
Cotton research at Clemson University showing the comparison of defoliation at the 4-leaf
stage and terminal removal to the untreated cotton.
Research began in 2014 to look at 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 and had simulated hail applied
at three growth stages: Tuber Initiation (TI),
Early Bulking (EB), and Late Bulking (LB).
Damage was applied at 0, 33, 66, and 95 percent and then taken to harvest. Losses varied
depending on the maturity of the potatoes as
shown in Table 8.
CROPINSURANCE TODAY®
9
Table of Contents for the Digital Edition of Crop Insurance Today August 2016
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Crop Insurance Today August 2016 - Cover2
Crop Insurance Today August 2016 - 1
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Crop Insurance Today August 2016 - Cover3
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