Descriptor list details

World Vegetable Center biotic stress descriptors for tomato

1.0

These descriptors are being used by the Breeding Unit and the Genetic Resources and Seed Unit (GRSU) of WorldVeg to screen for biotic stress in genebank accessions of tomato and its wild relatives. These descriptors have been published by Mohamed Rakha et al. (2017a;b Genetic Resources and Crop Evolution; https://doi.org/10.1007/s10722-015-0347-y; https://doi.org/10.1007/s10722-016-0421-0).

Crop
Tomato
Publisher
World Vegetable Center
Bibliographic citation

Rakha M, Bouba N, Ramasamy S, Regnard JL, Hanson P (2017) Evaluation of wild tomato accessions (Solanum spp.) for resistance to two-spotted spider mite (Tetranychus urticae Koch) based on trichome type and acylsugar content. Genetic Resources and Crop Evolution, 64(5), 1011-1022. DOI: 10.1007/s10722-016-0421-0.

Version
1.0

The taxa of the pest.

Classification
Biotic stress descriptor
Data type
Free text

There are two types of bioassay: choice and no choice.

Classification
Biotic stress descriptor
Data type
Coded
CodeTermDescription
12choice

Count of eggs 15 days after infestation.

Classification
Biotic stress descriptor
Data type
Numeric

Count of nymphs 15 days after infestation.

Classification
Biotic stress descriptor
Data type
Numeric

Count of pupae 15 days after infestation.

Classification
Biotic stress descriptor
Data type
Numeric

Count of adults 3 days after infestation.

Classification
Biotic stress descriptor
Data type
Numeric

Count of adults 19 days after infestation.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type I in a square millimeter. Determined from the interior middle section of the abaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type IV in a square millimeter. Determined from the interior middle section of the abaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type V in a square millimeter. Determined from the interior middle section of the abaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type VI in a square millimeter. Determined from the interior middle section of the abaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type I in a square millimeter. Determined from the interior middle section of the adaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type IV in a square millimeter. Determined from the interior middle section of the adaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type V in a square millimeter. Determined from the interior middle section of the adaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of number of trichome type VI in a square millimeter. Determined from the interior middle section of the adaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Percentage of adult mortality.

Classification
Biotic stress descriptor
Data type
Numeric

Count of eggs from 1 female after two days infestation.

Classification
Biotic stress descriptor
Data type
Numeric

The leaf damage 5 days after infestation.

Classification
Biotic stress descriptor
Data type
Scale
0
1
2
3

Legend:

0
No damage
1
Few small feeding patches (<20 % of leaf area)
2
Large feeding patches 20–49 % of leaf area
3
Entire leaf with feeding marks (>=50 % of leaf area)

Count of eggs from 10 females two days after infestation. Determined from the interior middle section of the abaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric

Count of eggs from 10 females two days after infestation. Determined from the interior middle section of the adaxial surface of the third leaf from the apex.

Classification
Biotic stress descriptor
Data type
Numeric