Crop Insurance Today Third Quarter 2020 - 22

TABLE 12

Peanut Response to
Plant Damage
Tifton, Georgia

Days After Planting

30 60 90 120
Level of Plant
Damage (%)

Loss%

0
33
66
99

0 0 0 0
23 45 56 50
30 50 65 63
57 80 94 91

PEANUT Plant Damage
Georgia

The peanut plants on the left had 99 percent damage applied 30 days after emergence and the
plants on the right had the same amount of damage applied at 120 days after emergence. This
shows that peanut plants can recover from complete defoliation when it occurs early in the
season (left), but when it occurs mid-to-late season, the crop does not have time to recover.

TABLE 14

'Blushing Belle' 'Creamer' Potato
Plant Damage-Washington

Growth Stage

% Damage

Tuber Size
Under-Sized Creamers (Ideal) Over-Sized
CWT/A

0 3 111 175

33 3 111 128
Tuber Initiation (8 DAE)

66
3
130
126

99 5 100 161

0 3 111 175

33 4 103 160
Row Closure (16 DAE)

66
13
99
86

99 4 96 44

0 3 111 175

33 5 112 98
Pre-Harvest (24 DAE)

66
8 120 59

99 12 131 21

NCIS developed research trials in 2018 at
Tifton, Ga., to evaluate plant damage effects on
peanut production. Researchers applied 33, 66,
and 99 percent plant damage at 30, 60, 90, and
120 days after planting. These planting dates represent a wide range of growth stages from early vegetative to near maturity. Results from the
first two years suggest that losses increase with 1)
increasing plant damage, and 2) number of days
after planting (Table 12).

POPCORN Stand Reduction
Nebraska, Ohio
Popcorn stand reduction research was completed in Nebraska and Ohio in 2019. The trial
consisted of applying stand reductions of 25, 50,
and 75 percent at the 5, 10, and 15-leaf growth
stages. The results were similar to research conducted on dent corn in 2013. These results indicated stand reduction loss from the 11 through
17-leaf growth stages are not as great as currently appraised. Losses at the 5 and 10-leaf stages
were nearly identical to the current charts for the
respective growth stages and levels of stand reduction (Table 13.). Losses at the 15-leaf growth
stage were less than the current 1-for-1 appraisal.
The data suggests that, because stand reduction
increases the growing space, plants compensate
by increasing ear production per plant. At the
highest levels of stand reduction, popcorn plants
averaged 1.7 ears per plant compared to 1.1 ears
per plant when no stand reduction occurred.

POTATOES-CREAMERS
Plant Damage
On the left, Wisconsin Creamer potatoes had 100 percent damage applied on July 8, 2019. The
photo was taken on July 30 showing how the plants can recover over time. On the right, the same
variety of potatoes but with no damage applied. Photo taken July 30.

22

THIRDQUARTER2020

Washington, Wisconsin
The potato industry is developing different types and varieties of potatoes to meet

Crop Insurance Today Third Quarter 2020

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