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.
Rhododendron simsii Planch. · Indica azalea
Karsten Rannacher
Vitis L. · Grapevine
GUIDO CIPRIANI / ENRICO PETERLUNGER / GABRIELE DI GASPERO / MICHELE MORGANTE / SIMONE DIEGO CASTELLARIN / RAFFAELE TESTOLIN
Glycine max (L.) Merr. · Soybean
MONSANTO TECHNOLOGY
Trifolium subterraneum L. · Subterranean clover
South Australian Research and Development Institute
Ribes x nidigrolaria Rud. Bauer et A. Bauer · Jostaberry
Rolf Bauer
Corylus avellana L. · Common hazel
RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»
Lupinus luteus L. · Yellow lupin
POHLAN| G. Pohlan in Fa. Saatzucht Bornhof GmbH
Ribes nigrum L. · Blackcurrant
ZVYaGINA TAT'YaNA STEPANOVNA / SERGEEVA KLAVDIYa DMITRIEVNA
Leptospermum J.R. et G. Forst. · Tea Tree
P. Ollerenshaw
Peperomia caperata Yunck. · Emerald ripple peperomia
Tingdal by Lundager ApS
x Petchoa J. M. H. Shaw · Petchoa
Moriya Kawashima
Vaccinium corymbosum L. · Highbush blueberry
Paul M. Lyrene James W. Olmstead
x Petchoa J. M. H. Shaw · Petchoa
Moriya Kawashima
Cordyline Comm. ex Juss. · Palm lily
Peter John Fraser
Salvia x sylvestris L. · Wood sage
Kievit Christa
Lophomyrtus xralphii (Hook. f.) Burret
Francis Doherty Malachy
Mandevilla sanderi (Hemsl.) Woodson · Brazilian jasmine
Lannes Robert
Picea glauca (Moench) Voss · White spruce
Scholten, Dirk
Rosa L. · Rose
Hooijman Aloysius A. J.
Rubus L. subg. Rubus · Blackberry
MARK F. CRUSHA & JOHN FANGARY
Caryopteris Bunge · Caryopteris
Sloane M. Scheiber^^^Jessica D. Janes^^^Emily E. Alff
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
PHUONG NGUYEN, MICHAEL D FERGUSON
hybrids between Leucadendron laureolum and Leucadendron salignum
John William Barson, Petronella Johanna Barson
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Sara Slotzky^^^Nir Dai^^^Zecharia Tanami