1998 Dry Bean Grower Survey of Pest Problems and Pesticide Use in Minnesota and North Dakota 

 ER 58
1998

Disease Problems

White mold was the worst disease problem for 39% of Northarvest respondents on 42% of their acres, followed by root rot for 15% of respondents on 15% of their acres, rust for 6% of respondents on 6% of their acres and bacterial blight for 5% of respondents on 4% of their acres (Table 8). White mold was a less common problem in 1998 than in 1997 and root rot was much more common in 1998 than in 1997. More respondents reported having no serious disease problem ("none") in 1998 than in 1997.

Root rot was the worst disease problem for 33% of Minnesota respondents on 46% of their acres. White mold was the worst disease problem for 33% of Minnesota respondents on 28% of their acres, followed by rust for 5% of Minnesota respondents on 7% of their acres and bacterial blight for 7% of Minnesota respondents on 6% of their acres (Table 8). Root rot was a much greater problem in Minnesota in 1998 than in 1997 and white mold was less of a problem.

White mold was the worst disease problem for 42% of North Dakota respondents on 48% of their acres, followed by rust for 7% of North Dakota respondents on 6% of their acres, root rot for 6% of respondentson 4% of their acres and bacterial blight for 4% of respondents on 4% of their acres (Table 8). White mold was a less common problem in North Dakota in 1998 than in 1997.

Table 8: Worst disease problema in 1998 in Minnesota and North Dakota

  Respondents Acres Reportedb

Worst Disease Problem

Number % Number %
Minnesota
Root Rot 19 33.3 11,461 46.0
White Mold 19 33.3 6,863 27.6
Rust 3 5.3 1,649 6.6
Bacterial Blight 4 7.0 1,374 5.5
Alternaria 1 1.8 700 2.8
None 6 10.5 1,163 4.7
North Dakota
White Mold 50 42.0 34,163 47.6
Rust 8 6.7 3,920 5.5
Root Rot 7 5.9 3,040 4.2
Bacterial Blight 5 4.2 2,536 3.5
Alternaria 1 0.8 600 0.8
None 34 28.6 18,266 25.4
Northarvest
White Mold 69 39.2 41,026 42.4
Root Rot 26 14.8 14,501 15.0
Rust 11 6.3 5,569 5.8
Bacterial Blight 9 5.1 3,910 4.0
Alternaria 2 1.1 1,300 1.3
None <40 22.7 19,429 20.1

aRanked as No. 1 disease problem by respondents.
bRespondents’ acres only.

White mold was ranked as one of the three worst diseases by Northarvest respondents on 53% of dry bean acres reported, considerably less than in 1995-1997. Root rot was ranked as one of the three worst diseases by Northarvest respondents on 36% of respondents' acres, up considerably from 1997. Bacterial blight was ranked as one of the three worst diseases by Northarvest respondents on 32% of their acres, up from 1998. Rust was ranked as one of the three worst diseases by Northarvest respondents on 27% of their acres, slightly lower than in 1997 (Table 9).

Root rot was one of the three worst diseases on 66% of Minnesota respondents' acres and on 26% of North Dakota respondents' acres (Table 9), substantial increases from 1997 in root rot ranking in both states. The data for all other diseases are fairly similar for both states and do not vary greatly from that of the combined data for both states (Northarvest total).

Table 9: Diseases ranked as one of the three worsta in 1998 in Minnesota and North Dakota

Respondents Acres Reported b
Disease Problem Number % Number %
Minnesota
Root Rot 33 57.9 16,361 65.7
White Mold 30 52.6 12,718 51.1
Bacterial Blight 18 31.6 9,279 37.3
Rust 12 21.1 6,306 25.3
Alternaria 3 5.3 1,815 7.3
None 6 10.5 1,163 4.7
North Dakota
White Mold 60 50.4 38,383 53.4
Bacterial Blight 30 25.2 21,671 30.2
Rust 34 28.6 20,230 28.2
Root Rot 27 22.7 18,864 26.3
Alternaria <5 4.2 4,015 5.6
None

34

28.6

18,266

25.4
Northarvest
White Mold 90 51.1 51,101 52.8
Root Rot 60 34.1 35,225 36.4
Bacterial Blight 48 27.3 30,950  
Rust 46 26.1 26,536 27.4
Alternaria 8 4.5 5,830 6.0
None 40 22.7 19,429 20.1

aRanked as No. 1,2 or 3 disease problem by respondents.
bRespondents’ acres only.