Abstract
The western bean cutworm, Striacosta albicosta (Smith) (Lepidoptera: Noctuidae), recently expanded its range from the western United States into the Great Lakes region of the United States and Canada, threatening eastern dry bean production. Our objectives were to better understand the relationship between cutworm infestation and damage in dry beans, and to determine the best method and timing of insecticide application to reduce pick. Infesting with at least one egg mass per 1.5 m, or as few as two larvae per 0.3 m, of row resulted in significantly more pod damage and pick than in uninfested plots. By 14 d after hatch, larvae were no longer on plants during the daytime; direct observations revealed that fifth instars climbed plants to feed between 2100 and 0600 hours, illustrating the impractically of using larval counts to make management decisions. There was a strong linear relationship between pod damage and percent pick, making scouting for pod damage a viable alternative to egg or larval scouting. Aldicarb soil insecticide or thiamethoxam-treated seed did not reduce cutworm damage. Instead, plots treated with these insecticides had significantly more pick than control plots, perhaps related to increased canopy growth or fewer natural enemies. The pyrethroid λ-cyhalothrin provided excellent control of cutworm when sprayed up to 18 d after infestation. Pick was similar among plots sprayed once up to 18 d after infestation or sprayed four separate times. In a field study, λ-cyhalothrin residue on field-treated foliage was 100% effective at controlling caterpillars up to 14 d after application.
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Claims 14
Claim · model-written summary
At least one cutworm egg mass per 1.5 m of row caused significantly more pod damage than uninfested plots.
Verbatim
e0“Infesting with at least one egg mass per 1.5 m, or as few as two larvae per 0.3 m, of row resulted in significantly more pod damage and pick than in uninfested plots”
t0“Michigan Dry Beans”
Claim · model-written summary
At least one cutworm egg mass per 1.5 m of row caused significantly more pick than uninfested plots.
Verbatim
e0“Infesting with at least one egg mass per 1.5 m, or as few as two larvae per 0.3 m, of row resulted in significantly more pod damage and pick than in uninfested plots”
t0“Michigan Dry Beans”
Claim · model-written summary
Two larvae per 0.3 m of row caused significantly more pod damage than uninfested plots.
Verbatim
e0“Infesting with at least one egg mass per 1.5 m, or as few as two larvae per 0.3 m, of row resulted in significantly more pod damage and pick than in uninfested plots”
t0“Michigan Dry Beans”
Claim · model-written summary
Two larvae per 0.3 m of row caused significantly more pick than uninfested plots.
Verbatim
e0“Infesting with at least one egg mass per 1.5 m, or as few as two larvae per 0.3 m, of row resulted in significantly more pod damage and pick than in uninfested plots”
t0“Michigan Dry Beans”
Claim · model-written summary
By 14 days after hatch, larvae were absent from plants during daytime.
Verbatim
e0“By 14 d after hatch, larvae were no longer on plants during the daytime”
t0“Michigan Dry Beans”
Claim · model-written summary
Fifth instar larvae climbed plants to feed between 2100 and 0600 hours.
Verbatim
e0“fifth instars climbed plants to feed between 2100 and 0600 hours”
t0“Michigan Dry Beans”
Claim · model-written summary
Pod damage had a strong linear relationship with percent pick.
Not reportedDirection
Verbatim
e0“There was a strong linear relationship between pod damage and percent pick”
t0“Michigan Dry Beans”
Claim · model-written summary
Aldicarb soil insecticide did not reduce cutworm damage.
- Taxon
- Dry Beanst0
- Treatment
- Aldicarb soil insecticidee0
- Interactor
- cutworme0pest
- Outcome
- cutworm damagee0
- Direction
- did not reducee0
Not reportedComparator
Verbatim
e0“Aldicarb soil insecticide or thiamethoxam-treated seed did not reduce cutworm damage”
t0“Michigan Dry Beans”
Claim · model-written summary
Thiamethoxam-treated seed did not reduce cutworm damage.
- Taxon
- Dry Beanst0
- Treatment
- thiamethoxam-treated seede0
- Interactor
- cutworme0pest
- Outcome
- cutworm damagee0
- Direction
- did not reducee0
Not reportedComparator
Verbatim
e0“Aldicarb soil insecticide or thiamethoxam-treated seed did not reduce cutworm damage”
t0“Michigan Dry Beans”
Claim · model-written summary
Aldicarb-treated plots had significantly more pick than controls.
Verbatim
e0“plots treated with these insecticides had significantly more pick than control plots”
e1“Aldicarb soil insecticide or thiamethoxam-treated seed did not reduce cutworm damage”
t0“Michigan Dry Beans”
Claim · model-written summary
Thiamethoxam-treated plots had significantly more pick than controls.
Verbatim
e0“plots treated with these insecticides had significantly more pick than control plots”
e1“Aldicarb soil insecticide or thiamethoxam-treated seed did not reduce cutworm damage”
t0“Michigan Dry Beans”
Claim · model-written summary
Lambda-cyhalothrin controlled cutworm when sprayed up to 18 days after infestation.
- Taxon
- Dry Beanst0
- Treatment
- λ-cyhalothrine0
- Interactor
- cutworme0pest
- Outcome
- control of cutworme0
- Direction
- excellente0
- Qualifier
- up to 18 d after infestatione0
Not reportedComparator
Verbatim
e0“The pyrethroid λ-cyhalothrin provided excellent control of cutworm when sprayed up to 18 d after infestation”
t0“Michigan Dry Beans”
Claim · model-written summary
Pick was similar after one spray up to 18 days and four sprays.
Verbatim
e0“Pick was similar among plots sprayed once up to 18 d after infestation or sprayed four separate times”
t0“Michigan Dry Beans”
Claim · model-written summary
Lambda-cyhalothrin residue on treated foliage controlled caterpillars completely up to 14 days after application.
- Taxon
- Dry Beanst0
- Treatment
- λ-cyhalothrin residuee0
- Interactor
- caterpillarse0pest
- Outcome
- controlling caterpillarse0
- Direction
- effectivee0
- Value
- 100%e0
- Qualifier
- up to 14 d after applicatione0
Not reportedComparator
Verbatim
e0“λ-cyhalothrin residue on field-treated foliage was 100% effective at controlling caterpillars up to 14 d after application”
t0“Michigan Dry Beans”
The same questions in other papers
lambda-cyhalothrin · pest · Phaseolus vulgaris (common bean)Results agree
1 paper in the same direction as this paper
- positive
insecticide · pest · Phaseolus vulgaris (common bean)Positive and negative results
3 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.