Abstract
Sweep-net sampling was evaluated as a method of sampling populations of adult western spotted cucumber beetles (WSCB), Dtabrotica undecimpunctata undecimpunctata Mannerheim, in snap beans, Phaseolus vulgaris L. Each of 18 fields was sampled initially between 0800 and 1000 hours; 1–6 subsequent sets of samples were collected later on the same date. Field means of beetle counts in sweep-net samples collected after the initial sampling episode (subsequent means) were significantly lower than the field mean of initial samples collected in the same field (initial mean) in 16 of 42 comparisons. Subsequent mean/initial mean ratios were negatively correlated (R2 = 0.72) with the amount of increase in solar radiation intensity between initial and subsequent sampling episodes. When fluctuations in beetle counts in sweep samples were described in relation to an average daily radiation curve, estimated counts were lowest for sampling conducted at 1300 hours. Time based correction factors used as multipliers to stabilize relative density estimates according to a standard (0900 hours) sampling time ranged from 0.9 for 1800 hours to 2.5 for 1300 hours. The linear relationship between corrected counts of WSCB in sweep-net samples and measures of WSCB absolute density (beetles per meter of row) was described by the equation: y = 0.44 + 2.55x (R2 = 0.69), where x = number of WSCB per meter of row and y = corrected number of WSCB per 10 sweeps.
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Claims 5
Claim · model-written summary
Sweep-net beetle counts at later sampling episodes were significantly lower than initial counts in 16 of 42 comparisons.
- Taxon
- snap beanse0
- Interactor
- western spotted cucumber beetles
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Diabrotica undecimpunctata undecimpunctatae0pest - Outcome
- Field means of beetle countse1
- Direction
- significantly lowere1
- Value
- 16 of 42e1
- Comparator
- initial meane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Sweep-net sampling was evaluated as a method of sampling populations of adult western spotted cucumber beetles (WSCB), Dtabrotica undecimpunctata undecimpunctata Mannerheim, in snap beans, Phaseolus vulgaris L.”
e1“Field means of beetle counts in sweep-net samples collected after the initial sampling episode (subsequent means) were significantly lower than the field mean of initial samples collected in the same field (initial mean) in 16 of 42 comparisons”
Claim · model-written summary
Subsequent-to-initial mean ratios of beetle counts were negatively correlated with the increase in solar radiation between sampling episodes.
- Taxon
- snap beanse0
- Treatment
- amount of increase in solar radiation intensitye2
- Interactor
- western spotted cucumber beetlesDiabrotica undecimpunctata undecimpunctatae0pest
- Outcome
- Subsequent mean/initial mean ratiose2
- Direction
- negatively correlatede2
- Qualifier
- R2 = 0.72e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweep-net sampling was evaluated as a method of sampling populations of adult western spotted cucumber beetles (WSCB), Dtabrotica undecimpunctata undecimpunctata Mannerheim, in snap beans, Phaseolus vulgaris L.”
e2“Subsequent mean/initial mean ratios were negatively correlated (R2 = 0.72) with the amount of increase in solar radiation intensity between initial and subsequent sampling episodes”
Claim · model-written summary
Estimated beetle counts were lowest for sweep sampling conducted at 1300 hours, compared with the 0900 hour standard.
- Taxon
- snap beanse0
- Treatment
- sampling conducted at 1300 hourse3
- Interactor
- western spotted cucumber beetlesDiabrotica undecimpunctata undecimpunctatae0pest
- Outcome
- estimated countse3
- Direction
- loweste3
- Comparator
- 0900 hourse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweep-net sampling was evaluated as a method of sampling populations of adult western spotted cucumber beetles (WSCB), Dtabrotica undecimpunctata undecimpunctata Mannerheim, in snap beans, Phaseolus vulgaris L.”
e3“estimated counts were lowest for sampling conducted at 1300 hours”
e4“Time based correction factors used as multipliers to stabilize relative density estimates according to a standard (0900 hours) sampling time ranged from 0.9 for 1800 hours to 2.5 for 1300 hours”
Claim · model-written summary
Time-based correction factors for beetle counts ranged from 0.9 at 1800 hours to 2.5 at 1300 hours.
- Taxon
- snap beanse0
- Interactor
- western spotted cucumber beetlesDiabrotica undecimpunctata undecimpunctatae0pest
- Outcome
- correction factorse4
- Value
- from 0.9 for 1800 hours to 2.5 for 1300 hourse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweep-net sampling was evaluated as a method of sampling populations of adult western spotted cucumber beetles (WSCB), Dtabrotica undecimpunctata undecimpunctata Mannerheim, in snap beans, Phaseolus vulgaris L.”
e4“Time based correction factors used as multipliers to stabilize relative density estimates according to a standard (0900 hours) sampling time ranged from 0.9 for 1800 hours to 2.5 for 1300 hours”
Claim · model-written summary
Corrected sweep-net counts of beetles are linearly related to absolute density, y = 0.44 + 2.55x (R2 = 0.69).
- Taxon
- snap beanse0
- Interactor
- western spotted cucumber beetlesDiabrotica undecimpunctata undecimpunctatae0pest
- Outcome
- linear relationship between corrected countse5
- Value
- y = 0.44 + 2.55xe5
- Qualifier
- R2 = 0.69e5
- Comparator
- measures of WSCB absolute densitye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweep-net sampling was evaluated as a method of sampling populations of adult western spotted cucumber beetles (WSCB), Dtabrotica undecimpunctata undecimpunctata Mannerheim, in snap beans, Phaseolus vulgaris L.”
e5“The linear relationship between corrected counts of WSCB in sweep-net samples and measures of WSCB absolute density (beetles per meter of row) was described by the equation: y = 0.44 + 2.55x (R2 = 0.69)”