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 Cucumber 8 Indica azalea 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.

Qualicum

Active

Rubus idaeus L. · Red raspberry

PACIFIC AGRI-FOOD RESEARCH CENTRE AGASSIZ

4 records

Pitstop

Terminated

Chrysanthemum L. · Chrysanthemum

Cleangro Ltd

1 record

Mormin1201

Active

Jasminum officinale L. x Jasminum polyanthum Franch.

BRANDED GARDEN PRODUCTS

1 record

Paulina

Active

Rhododendron simsii Planch. · Indica azalea

Karsten Rannacher

1 record

Omega Time Pink

Withdrawn

Chrysanthemum L. · Chrysanthemum

Cleangro Ltd

1 record

Montblanc

Withdrawn

Fittonia albivenis (Lindl. ex hort. Veitch) Brummitt · Nerve plant

Eden Collection B.V.

1 record

Lind

Active

Dracaena steudneri Schweinf. ex Engl.

Joost Vermeulen, Mathijs Vermeulen

2 records

LOWBEAM

Withdrawn

Jasminum officinale L. · Common Jasmine

Stuart Lowen

1 record

Late Love

Withdrawn

Hydrangea aspera Buch.-Ham. ex D. Don · Rough-leaved hydrangea

WIM RUTTEN

1 record

Kerverblu

Withdrawn

Petunia Juss. · Petunia

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

1 record

Jack Kuranda

Terminated

Guzmania Ruiz et Pav. · Guzmania

Henny Bos B.V.

1 record

H220909

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Hydrangea Breeders Association B.V.

1 record

Fluostern

Withdrawn

Rhododendron simsii Planch. · Indica azalea

Peter De Langhe

1 record

Bouquet 3176

Application submitted

hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.

Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

1 record

Bouquet 3160

Application submitted

hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.

Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

1 record

Dalton

Terminated

Schefflera J. R. Forst. & G. Forst. · Umbrella tree

NEDERPELT G.M.

1 record

Ben Lair

Terminated

Ribes nigrum L. · Blackcurrant

SCOTTISH CROP RESEARCH INSTITUTE

2 records

Bouquet 3179

Application submitted

hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.

Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

1 record

COMUN APIRENO

Active

Citrus reticulata Blanco · Mandarin orange

1 record

Cherry Sparks

Terminated

Penstemon Schmidel. · Beard Tongue

Valentin Taquet

1 record

bullechi 01

Terminated

Echinacea purpurea (L.) Moench · Purple coneflower

Hartwig Bull

1 record

Whitestar

Protection expired

Goeppertia majestica (Linden) Borchs. & S. Suárez

1 record

White Star

Withdrawn

Exacum L. · Persian violet

1 record

Tender Rose

Active

Hydrangea paniculata Siebold · Panicled hydrangea

Information regarding the breeder received in the contribution to CPVO :Darthuizer

1 record

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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.