Pests
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.
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.
Chrysanthemum L. · Chrysanthemum
VAN DER JAGT MARTINUS
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Viveros California S.L.^^^Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)^^^Instituto Valenciano de Investigaciones Agrarias (IVIA)^^^Instituto Andaluz de Investigación y Formación Agraria Pesquera y Alimentaria (IFAPA)
Corylus avellana L. · Common hazel
Shawn A. Mehlenbacher, Rebecca L. McCuskey, David C. Smnit
Medicago sativa L. · Alfalfa
WATERMAN LOOMIS
Bouvardia Salisb. · Bouvardia
JOHN M.F.DE JOHN
Vitis vinifera L. · Common grape vine
Morgante Michele
Corylus avellana L. · Common hazel
Shawn A. Mehlenbacher, Rebecca L. McCuskey, David C. Smnit
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
UNIVERS. OF FLORIDA
Corylus avellana L. · Common hazel
Shawn A. Mehlenbacher, Rebecca L. McCuskey, David C. Smnit
Ficus lyrata Warb. · Banjo fig
Knaap, Eduard J. M. van der|Wilgenlei 15, 2665 KN Bleiswijk, Netherlands
Begonia x hiemalis Fotsch · Elatior Begonia
LUBBERTUS H.KOPPE
Rubus idaeus L. · Red raspberry
Diego Ioriatti c/o Berryplant
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Omar Carrillo Mendoza, Maribel Martínez Negrete, Manuel López y Renae R. Robertson
Guzmania Ruiz et Pav. · Guzmania
Nicolaas D.M. Steur^^^Elly Bak
Rubus idaeus L. · Red raspberry
NIELS ARTS
Gossypium hirsutum L. · Upland cotton
DPL TECHNOLOGY HOLDING CO
Ficus lyrata Warb. · Banjo fig
van der Knaap Eduard J.M.
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Bernardini Danilo
Picea A. Dietr. · Spruce
JEURISSEN-WIJNEN| Lucien Jeurissen-Wijnen
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
PLANTAS DE NAVARRA, S.A.(PLANASA)
Vaccinium L. · Bilberry
Paul M. Lyrene James W. Olmstead
Musa sikkimensis Kurz
Chauvet Bruno
Ribes nigrum L. · Blackcurrant
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry