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.

Biancu Gentile

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

Bouquet 3160

Active

Vitis L. · Grapevine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Blue Wonder

Terminated

Picea A. Dietr. · Spruce

Karl Dienst

1 record

Bouquet 3176

Active

Vitis L. · Grapevine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Bouquet 3179

Active

Vitis L. · Grapevine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Bahriana

Terminated

Fragaria L. · Strawberry

Kopan Volodymyr Pavlovych, Kopan` Vira Mykolaivna,

1 record

Ananasowa z Grójca ISK

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

1 record

Akorn

Active

Corylus avellana L. · Common hazel

Tsybenko Ihor

2 records

YANEARL

Withdrawn

Lophomyrtus xralphii (Hook. f.) Burret

Stephen J. Yandall, Susan M. Yandall

1 record

(96-11-53) Rozana

Active

Fragaria L. · Strawberry

Kopan Volodymyr Pavlovych, Kopan` Kira Mykolaivna,

2 records

Vertti

Active

Ribes nigrum L. · Blackcurrant

Maa- ja elintarviketaouden tutkimuskeskus (MTT)/ Present Luonnonvarakeskus (Luke))

1 record

Veloy

Active

Ribes nigrum L. · Blackcurrant

VOLODINA YEKATARINA V.^^^KHOTIMSKAYA SVETLANA P.^^^KHABAROVA NDEZHDA N.

4 records

TOSTD0194

Active

Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium

Floha V.O.F

1 record

Thomimblue

Withdrawn

Impatiens namchabarwensis R. J. Morgan et al.

CHARLES VALIN

1 record

Sunmandecrikin

Terminated

Mandevilla boliviensis (Hook. f.) Woodson

Tomoya MISATO, Yasuyuki Murakami

1 record

Sheila

Withdrawn

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Kwekerij Sidaco B.V.

1 record

Songlines

Withdrawn

Acacia baileyana F. Muell. · Bailey's acacia

Hillier Nurseries Ltd

1 record

SH 1923

Withdrawn

Saxifraga cortusifolia Siebold & Zucc.

Josef Heuger

1 record

Sene Nina 55

Application submitted

Pericallis x hybrida (Scheidw.) B. Nord. · Cineraria

Kiyoshi Miyazaki

1 record

Royal Time

Terminated

Chrysanthemum L. · Chrysanthemum

Cleangro Ltd

1 record

Schoene Helene

Terminated

Pyrus communis L. · European pear

JACOB HELMUT DR.

2 records

Skjold

Terminated

Tilia cordata Mill. · Small-leaved lime

University of Aarhus - Aarslev

1 record

Serenade

Withdrawn

Argyranthemum frutescens (L.) Sch. Bip. · Marguerite daisy

L.M.S. ApS

1 record

Rosemary Foster

Active

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

Maurice C. Foster

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.