Life Tables and Larval Dispersal of Mexican Bean Beetle (Coleoptera: Coccinellidae) on Dry Bean in the High Plains

Barrigossi, J. A. F.; Hein, Gary L.; Higley, Leon G.

doi:10.1603/0046-225x-30.2.235

Cited by 9 publications

(17 citation statements)

References 20 publications

(31 reference statements)

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“…We also assessed pupal densities after infestation with egg masses in our 1996 yield-loss studies. The average survivorship from egg to pupal stage across two Þelds in 1996 (n ϭ 8) was 32.1% (SE 0.019), which agrees closely with data from separate life table studies (Barrigossi et al 2001a). Consequently, the ET expressed in egg masses/row-m should be divided by the expected survivorship rate of 33% to provide the most accurate ET.…”

Section: Resultssupporting

confidence: 84%

“…From life table studies (Barrigossi et al 2001a), we sampled 78 total egg masses with an average of 54.6 (SE 0.7) eggs/egg mass. However, not all eggs will survive to produce injurious larvae, so an important reÞnement is to adjust the ET to account for survivorship.…”

Section: Resultsmentioning

confidence: 99%

“…Our life table data on Mexican bean beetle indicate that substantial mortality occurs in the egg and early larval stages, so that failing to account for this mortality in determining an egg mass ET would greatly underestimate the real ET. From life tables of eggs through adult in six Þelds over 2 yr, we observed egg to pupa mean survivorship of Ϸ9% in dry years and 33% in normal years (Barrigossi et al 2001a). We also assessed pupal densities after infestation with egg masses in our 1996 yield-loss studies.…”

Section: Resultsmentioning

confidence: 99%

“…However, the EIL in larvae/row-m was converted to egg masses/row-m based on an average of 52 eggs per egg mass (Barrigossi et al 2001b) and adjusted to reßect average survivorship to the adult stage (Barrigossi et al 2001a). …”

Section: Methodsmentioning

confidence: 99%

“…Our previous research on egg mass sampling (Barrigossi et al 2001a) and Mexican bean beetle life tables on dry bean (Barrigossi et al 2001b) established dispersion and survivorship data necessary to use egg mass sampling in Mexican bean beetle management.…”

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confidence: 99%

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Economic Injury Levels and Sequential Sampling Plans for Mexican Bean Beetle (Coleoptera: Coccinellidae) on Dry Beans

Barrigossi

Hein

Higley

2003

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Field studies were conducted during the growing seasons of 1995 and 1996, in Scotts-bluff, Nebraska, to determine yield-loss relationships for Mexican bean beetle (Epilachna varivestis Mulsant) on dry bean (Phaseolus vulgaris L.). Results of those experiments were combined with data from other studies previously conducted to develop economic injury levels (EILs), economic thresholds (ETs), and a sequential sampling program for Mexican bean beetle. Yield loss was regressed against larvae/row-m, and the slope of the linear regression (113 kg/ha per larvae/row-m) was used as the DI (yield loss/insect density) variable in EIL calculations. The EILs calculated in larvae/row-m were converted to egg masses/row-m and adjusted to reflect average survivorship to the adult stage. An example EIL for esfenvalerate at 0.509 (formulation) liter/ha (0.0453 gal/a) and crop value of 0.44 dollars/kg (20 dollars/100 lbs) was 17.78 larvae/row-m. The corresponding ET is 1.04 egg masses/row-m, which reflects an average of 54.6 eggs/egg mass and 33% survival rate from egg to injurious stages. Sequential sampling plans were calculated based on a negative binomial distribution using parameter k estimated from previous research. Because sampling is based on egg masses, growers can make management decisions and take management actions before significant injury occurs. Also, ETs can be adjusted to include the occurrence of natural mortality in the egg and early instars. Analyses demonstrated that relatively minor variation in ETs has substantial impact on sequential sampling plans, including parameters such as average sample number. An interactive spreadsheet was developed that allows users to input economic and other data specific to their situation to calculate Mexican bean beetle EILs, ETs, and sequential sampling plans.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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