Pests

Spider mite

Tetranychus urticae

The spider mite is an arachnid that damages plants by sucking out cell sap and chlorophyll. The damage manifests as yellowing, curling, and drying of leaves, which leads to a significant reduction in yield.

Mentioned in descriptions 1 326 varieties reference book.

The spider mite is a dangerous pest that pierces the leaf epidermis and sucks out cell sap, leading to the destruction of chloroplasts and the inhibition of photosynthesis. Initial signs of infestation include the appearance of small light spots on the upper side of the leaf. In advanced cases, a fine web and colonies of the pest are found on the underside of the leaf, and the plant itself turns yellow, dries up, and can lose up to 60% of its yield.

The rate of reproduction and the degree of damage directly depend on temperature and humidity: at +25...+30°C and humidity below 60%, the pest's development cycle shortens to 5–7 days. A favorable factor for mite feeding is excessive nitrogen nutrition, which makes plant tissues looser. Furthermore, crop vulnerability often depends on agronomic practices, as mites are prone to developing resistance rapidly.

A variety's resistance to spider mites is determined by morphological features, such as leaf blade density or the presence of trichomes, as well as biochemical characteristics. No unified international coding system for such resistance exists; therefore, in descriptions, it is usually assessed qualitatively as "tolerance" or "relative resistance." When selecting a variety, it is recommended to clarify the evaluation methodology, including the conditions of field trials or artificial infestation.

Sources10

Breakdown by crop

Two-spotted spider mite — strawberry 34 Spider mite — blackcurrant 18 Apple Spider Mite 16 Spider mites on grapevine 13 Spider Mites on Common Hazel 12 Spider mite on Hydrangea macrophylla 10 Spider Mite of Cucumber 8 Strawberry Spider Mite 7 Raspberry spider mite 6 Two-spotted spider mite on chrysanthemum 6 Spider Mite — Soybean 6 Spider mite — Hydrangea paniculata 5 Spider Mites of Grapevine 5 Azalea spider mite 4 Pear Spider Mite 3 Plum spider mite 3 Tomato spider mite 3 Spider mite on mullein 3 Citrus red mite 3 Spider Mites on Cordyline 3

Found in these crops

Blackcurrant 86 Common hazel 58 Grapevine 51 Garden strawberry 45 Common grape vine 26 Apple 16 Strawberry 14 Red raspberry 11 Bigleaf hydrangea 10 Indica azalea 8 Cucumber 8 Soybean 7

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

Tarzan

Active

Dracaena marginata Lam.

DONALD E. BROYLES JR

2 records

SAKPXC046

Application submitted

x Petchoa J. M. H. Shaw · Petchoa

Moriya Kawashima

2 records

Ruijgrok

Active

Acer campestre L.

Boomkwekerij L.B. Ruijgrok V.O.F.

2 records

Red Log

Active

Peperomia rubella x Peperomia verticillata

Eden Collection B.V.

2 records

Oostani

Active

Anisodontea capensis (L.) D. M. Bates

Cornelis A. Oostveen

2 records

Plum Smokey

Application submitted

Verbascum L. · Mullein

Korlipara Harini|Canby, OR, US

2 records

Paramore

Active

Salix x dasyclados x Salix rehderiana

Kevin Lindegaard

2 records

MI00121

Active

Phalaenopsis Bl. · Moth Orchid

Floréac N.V.

2 records

Lavender Lass

Active

Verbascum L. · Mullein

Korlipara Harini|Canby, OR, US

2 records

Lannorthdakota

Active

Mandevilla sanderi (Hemsl.) Woodson · Brazilian jasmine

Lannes Robert

2 records

Limelight

Active

Dracaena fragrans (L.) Ker Gawl. · Corn plant

GAMBOA CECILIANO JULIO

2 records

Little Janie

Active

Oenothera lindheimeri (Engelm. & A. Gray) W. L. Wagner & Hoch · Lindheimer's beeblossom

Lynne Knosher

2 records

Jolo

Terminated

Guzmania Ruiz et Pav. · Guzmania

Elias Scandor

2 records

Honey Dijon

Active

Verbascum L. · Mullein

Korlipara Harini|Canby, OR, US

2 records

H220913

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Hydrangea Breeders Association B.V.

2 records

Kerbespicit

Active

Begonia x tuberhybrida Voss · Tuberous begonia

Timothy Edward Kerley^^^David William Kerley^^^Priscilla Grace Kerley^^^Sarah Elisabeth Kerley

2 records

Emerald

Active

Thuja L. · Arborvitae

Heco Stekcultures B.V.

2 records

Drisstrawninetytwo

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Michael D. Ferguson, Phuong Nguyen y Kevin Coons

2 records

Colossus

Active

Vaccinium corymbosum L. · Highbush blueberry

Paul M. Lyrene James W. Olmstead

2 records

Bostulu

Active

Buddleja L. · Buddleia

SCOTT C TREES

2 records

BL516

Active

Persea americana Mill. · Avocado

The Regents of the University of California

3 records

Binar

Active

Ribes nigrum L. · Blackcurrant

VOLODINA YEKATARINA V.^^^KHOTIMSKAYA SVETLANA P.^^^TIKHONOVA OLGA A.

5 records

Balcherissam

Active

Erysimum linifolium (Pers.) J. Gay · Wallflower

Trees Scott C

4 records

Balquared

Active

Penstemon Schmidel. · Beard Tongue

Valentin Taquet^^^Christa Kievit

2 records

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Pests

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.