Crop Insurance Today Third Quarter 2020 - 25

TABLE 17

TABLE 20

'Baby Boomer' 'Creamer' Potato

Sweet Corn Stand
Reduction

Plant Damage-Wisconsin
		
	
Growth Stage		
	
% Damage	

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

		
0	
		
33	
Tuber Initiation (8 DAE)
	
	66	
		
99	
		
0	
		
33	
Row Closure (16 DAE)
	
	66	
		
99	
		
0	
		
33	
Mid-Bulking (21 DAE)
	
	66	
		
99	
		
0	
		
33	
Late-Bulking (33 DAE)
	
	66	
		
99	
		
0	
		
33	
Pre-Harvest (40 DAE)
	
	66	
		
99	

48	 199	 20
43	 200	 14
43	
176	
11
41	 134	 5
48	 199	 20
44	 177	 16
46	 165	
9
48	 93	 3
48	 199	 20
47	 169	 10
57	 160	 11
47	 54	 2
48	 199	 20
60	 125	 7
64	
85	
4
72	 43	 3
48	 199	 20
56	 119	 5
64	 88	
4
62	 86	 2

TABLE 18

Sugarbeet Stand Reduction-Growth Stage

Minnesota-3 Year Average
			Stand Reduction %
		
25	50	75
	 Growth Stage	
Loss%

	
5-Leaf	 1	 5	21
	 5-Leaf Chart	10	22	50
	
10-Leaf	 7	 16	37
	 10-Leaf Chart	10	22	50
	
15-Leaf	 17	30	57
	 15-Leaf Chart	25	50	75

TABLE 21

Sweet Corn Stand
Reduction
Wisconsin-3 Year Average
			Stand Reduction %
		
25	50	75
	 Growth Stage	
Loss%

	
5-Leaf	 0	 5	14
	 5-Leaf Chart	10	22	50
	
10-Leaf	 8	 18	34
	 10-Leaf Chart	10	22	50
	
15-Leaf	 12	20	38
	 15-Leaf Chart	25	50	75

North Dakota and Minnesota-2 Year Average
	 Growth Stage	

Root Yield (tons/acre)	

Sucrose (%)	

Recoverable Sucrose (lb./acre)

	 4 to 6 Leaf	35.2	 15.8	
	 8 to 10 Leaf	35.1	 15.5	
	 12 to 14 Leaf	32.6	 15.8	

9696
9495
9025

TABLE 19

Sugarbeet Stand Reduction
North Dakota and Minnesota-2 Year Average
	Stand Reduction	

	
	
	
	
	

Root Yield (tons/acre)	

Sucrose (%)	

Recoverable Sucrose (lb./acre)

Check	38.1	15.9	
20%	 36.8	15.8	
40%	 36.9	15.7	
60%	 34.5	15.6	
80%	 25.1	15.2	

Research Center in Arlington, Wis., began in
2017. Sweet corn stands were thinned 25, 50,
and 75 percent at three growth stages, 5, 10,
and 15-leaf. In Minnesota, losses were less at
all growth stages than current charts indicate
(Table 20). This was particularly evident at stag-

10602
10184
10098
9423
6719

es beyond 11 leaf where the current charts appraise a 1-for-1 loss. Results in Wisconsin were
similar to those in Minnesota but were less at
the 15-leaf stage, and losses are considerably
less than 1-for-1 losses appraised with current
charts (Table 21).

WHEAT STEM BREAKS
Kansas
In 2016, NCIS developed research in conjunction with Kansas State University on winter
wheat at Manhattan-a Zone 1 location. The research was expanded in 2018 to Garden City-a
Zone 2 location. The trials were designed to
evaluate the current chart factors for hanging
wheat heads broken above or below the flag leaf.
Treatments consisted of breaking-over all wheat
heads in each plot at the boot, milk, anthesis, soft
dough, and hard dough developmental stages. At
Manhattan, high hanger (above flag leaf breaks)
losses at all growth stages were considerably less
than the current chart factors for Zone 1 wheat
(Table 22). Low hanger (below flag leaf breaks)
losses at the boot, anthesis, and soft dough stages
ranged from 11-29 percentage points less than
the current Zone 1 chart factors. Losses at the
milk and hard dough stages were within five
percentage points of the current chart factors.
At Garden City, high hanger losses at all growth
stages were also considerably less than current
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25
Crop Insurance Today Third Quarter 2020

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