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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.

Mede must

Active

Ribes nigrum L. · Blackcurrant

EE
3 records

Japo II

Active

Allium sativum L. · Garlic

CZ
3 records

Mara Eglite

Active

Ribes nigrum L. · Blackcurrant

LV
2 records

Lentjai

Active

Ribes nigrum L. · Blackcurrant

EE
3 records

Katiusha

Active

Ribes nigrum L. · Blackcurrant

EE
3 records

Kama

Active

Fragaria L. · Strawberry

CZ
4 records

Josta

Active

Ribes L. · Currants

SI
2 records

EBONY

Active

Prunus avium (L.) L. · Sweet cherry

ES
3 records

Festival

Active

Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon

FR
2 records

Dainiai

Active

Ribes nigrum L. · Blackcurrant

LT
4 records

Domino

Active

Ribes nigrum L. · Blackcurrant

LT
3 records

Elmar

Active

Ribes nigrum L. · Blackcurrant

EE
3 records

Didikai

Active

Ribes nigrum L. · Blackcurrant

LT
3 records

Caseille

Active

Ribes x nidigrolaria Rud. Bauer et A. Bauer · Jostaberry

NL
3 records

Corabel

Active

Corylus avellana L. · Common hazel

NL
2 records

Bogatyr

Active

Ribes nigrum L. · Blackcurrant

EE
2 records

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