Dynamic economic thresholds for the management of vegetable leafminer on glasshouse cucumber estimated by simulated defoliation

Dynamic economic thresholds for the management of vegetable leafminer on glasshouse cucumber estimated by simulated defoliation

Defoliation by the vegetable leafminer, Liriomyza sativae Blanchard (Diptera: Agromyzidae), was simulated by removing known amounts of leaf area with a hole punch in a glasshouse experiment that evaluated 21 combinations of defoliation intensity, timing and duration on cucumber yields. Defoliation w...

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Bibliographic Details
Published in:Journal of applied entomology (1986) Vol. 144; no. 8; pp. 719 - 731
Main Authors: Iranipour, Shahzad, Alaei, Tahereh, Karimzadeh, Roghaiyeh, Michaud, J. P.
Format: Journal Article
Language:English
Published: Berlin Wiley Subscription Services, Inc 01-09-2020
Subjects:
Agricultural economics
Algorithms
Computer simulation
Crop yield
Cucumis sativa
Decisions
Defoliation
Economic impact
economic injury level
Economics
Greenhouses
Heterogeneity
Impact analysis
Infestation
Leaf area
Leaves
Liriomyza sativae
Management decisions
risk assessment
sampling effort
Sequential sampling
Spatial heterogeneity
Statistical analysis
Vegetables
yield loss
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Summary:Defoliation by the vegetable leafminer, Liriomyza sativae Blanchard (Diptera: Agromyzidae), was simulated by removing known amounts of leaf area with a hole punch in a glasshouse experiment that evaluated 21 combinations of defoliation intensity, timing and duration on cucumber yields. Defoliation was quantified in cm2‐days (leaf area removed x no. days), and linear regression was used to correlate yield losses to simulated damage. The probability of erroneous decisions associated with different intensities of sequential sampling was explored. Spatial heterogeneity in leafminer infestation and the cumulative impact of defoliation over time were both considered, and the economic costs associated with wrong decisions were also assessed. Significant yield loss was observed beyond 10,000 cm2‐days of defoliation, whereas lower defoliation levels were tolerated by plants. The economic injury level (EIL) rose at an increasing rate as the onset of defoliation moved later in the season. An algorithm was used to estimate monthly EILs that farmers can use to guide leafminer management decisions in cucumber and minimize their economic risk.
ISSN:0931-2048
1439-0418
DOI:10.1111/jen.12790