Development and validation of diagrammatic scales to evaluate damage by the two-spotted spider mite (Tetranychus urticae) in peanut


 Argentina is the second largest peanut (Arachis hypogaea L.) exporter in world. The main pest our country two-spotted spider mite (Tetranychus urticae Koch 1836). To date, there no validated method to quantify this pest. aim of work was develop and validate a logarithmic diagrammatic scale assess damage by peanut. In 2015-16, 200 leaflets were collected from plot infested with Damaged leaf area (DLA) calculated using SisCob software. Six-, seven-, eight- nine-class scales proposed. Mean values for each class obtained 2-LOG. Leaflets analyzed 13 raters who used four proposed scales. Precision accuracy determined simple linear regression between DLA estimated damaged area. Reproducibility estimates combined pairs. seven-class best one all parameters. Most showed constant deviations overestimated DLA, whereas only rater presented systematic deviations. This first developed evaluate Argentina.
 Highlights
 According validation results, terms accuracy, precision reproducibility above 0.80, 0.75 respectively.
 are useful tools assessment, fundamental parameters integrated management.
 evaluating crop With loss function will be calculate which allow estimation EIL pest.