Premium
Dynamic economic thresholds for the management of vegetable leafminer on glasshouse cucumber estimated by simulated defoliation
Author(s) -
Iranipour Shahzad,
Alaei Tahereh,
Karimzadeh Roghaiyeh,
Michaud J. P.
Publication year - 2020
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/jen.12790
Subject(s) - agromyzidae , economic threshold , biology , infestation , greenhouse , pest analysis , agronomy , integrated pest management , yield (engineering) , growing season , phenology , horticulture , toxicology , materials science , metallurgy
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 cm 2 ‐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 cm 2 ‐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.