Abstract
Damage to beans by feeding of larvae and adults of Diabrotica balteata LeConte and Cerotoma facialis Erickson was evaluated under greenhouse and field conditions. 2nd and 3rd instars were more damaging than 1st instars and caused stand losses of up to 100%. In general, although C. facialis larvae were more damaging than those of D. balteata, both caused significant reductions of leaf area in plants that survived infestation at 1,4, and 7 days after seeding. No significant reduction in leaf area was found when 14-day-old or older plants were infested with 10 larvae per plant. The effect of adult feeding on yield was measured at different growth stages of the plant. Mixed and pure populations of these species at the rate of two and four adults per plant caused losses of up to 60% during the initial period of growth (8 to 15 days) and to a lesser extent during flowering. No significant damage was detected at other stages of the growth cycle. Since average adult field populations (0.6 to 1.0 adults per plant) are below these critical levels, it is concluded that, in areas in which the adults are not acting as virus vectors, the common practice of spraying against these insects is seldom justified.
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Claims 7
Claim · model-written summary
Second and third instar larvae caused up to 100% bean stand loss and were more damaging than first instars.
- Taxon
- Common Beans
Phaseolus vulgarist0 - Interactor
- Diabrotica balteata and Cerotoma facialist0pest
- Outcome
- stand lossese0
- Direction
- more damaginge0
- Value
- up to 100%e0
- Comparator
- 1st instarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2nd and 3rd instars were more damaging than 1st instars and caused stand losses of up to 100%.”
t0“Common Beans by Larvae and Adults of Diabrotica balteata and Cerotoma facialis”
Claim · model-written summary
C. facialis larvae were generally more damaging than D. balteata larvae.
- Taxon
- Common BeansPhaseolus vulgarist0
- Interactor
- C. facialise0pest
- Outcome
- more damaginge0
- Direction
- more damaginge0
- Comparator
- D. balteatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, although C. facialis larvae were more damaging than those of D. balteata”
t0“Common Beans”
Claim · model-written summary
Larval feeding significantly reduced leaf area in surviving beans infested 1, 4 or 7 days after seeding.
- Taxon
- Common BeansPhaseolus vulgarist0
- Treatment
- infestation at 1,4, and 7 days after seedinge0
- Interactor
- C. facialis larvaee0pest
- Outcome
- leaf areae0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, although C. facialis larvae were more damaging than those of D. balteata, both caused significant reductions of leaf area in plants that survived infestation at 1,4, and 7 days after seeding.”
t0“Common Beans”
Claim · model-written summary
Infesting beans at 14 days or older with 10 larvae per plant did not significantly reduce leaf area.
- Taxon
- Common BeansPhaseolus vulgarist0
- Organ / stage
- 14-day-old or older plantse0
- Treatment
- infested with 10 larvae per plante0
- Interactor
- larvaee0pest
- Outcome
- leaf areae0
- Direction
- No significant reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant reduction in leaf area was found when 14-day-old or older plants were infested with 10 larvae per plant.”
t0“Common Beans”
Claim · model-written summary
Two or four adults per bean plant caused up to 60% yield loss during early growth, with smaller losses during flowering.
- Taxon
- Common BeansPhaseolus vulgarist0
- Organ / stage
- initial period of growth (8 to 15 days)e0
- Treatment
- two and four adults per plante0
- Interactor
- these speciese0pest
- Outcome
- lossese0
- Direction
- lossese0
- Value
- up to 60%e0
- Qualifier
- to a lesser extent during floweringe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mixed and pure populations of these species at the rate of two and four adults per plant caused losses of up to 60% during the initial period of growth (8 to 15 days) and to a lesser extent during flowering.”
t0“Common Beans”
Claim · model-written summary
Adult feeding caused no significant bean damage at the other growth stages.
- Taxon
- Common BeansPhaseolus vulgarist0
- Organ / stage
- other stages of the growth cyclee0
- Outcome
- damagee0
- Direction
- No significant damagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant damage was detected at other stages of the growth cycle.”
t0“Common Beans”
Claim · model-written summary
The authors conclude that spraying against these insects is seldom justified where adults are not virus vectors, because field densities are below damaging levels.
- Taxon
- Common BeansPhaseolus vulgarist0
- Interactor
- these insectse0pest
- Outcome
- spraying against these insects is seldom justifiede0
- Qualifier
- in areas in which the adults are not acting as virus vectorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Since average adult field populations (0.6 to 1.0 adults per plant) are below these critical levels, it is concluded that, in areas in which the adults are not acting as virus vectors, the common practice of spraying against these insects is seldom justified.”
t0“Common Beans”
The same questions in other papers
infection · growth · Phaseolus vulgaris (common bean)Positive and negative results
9 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 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.