Pests
Aleyrodidae
The whitefly is a dangerous pest that damages plants by sucking phloem sap and transmitting viruses. Varietal resistance is provided by physical and chemical characteristics of plant tissues that reduce their attractiveness to the insect.
Mentioned in descriptions 252 varieties reference book.
The whitefly appears as a small insect, with colonies concentrating on the underside of young leaves. Typical signs of infestation include a "white cloud" when plants are shaken, a sticky honeydew coating, subsequent development of sooty mold, the appearance of chlorotic spots, and tissue deformation.
A variety's resistance to whitefly is determined by its ability to limit pest development through leaf texture or the specific composition of metabolites. Genetic resistance is assessed by breeding companies using standardized codes, though the level of protection may vary depending on the pest population's adaptation to a specific biotype.
The effectiveness of varietal resistance depends directly on growing conditions, as plant stress caused by disrupted nutrient or irrigation regimes increases their attractiveness to insects. Complete immunity is extremely rare; therefore, breeding achievements require supplementation with biological and physical control methods.
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 indicum L. · Indian chrysanthemum
W. John LAYNG (US)
Tagetes L. · Marigold
Ing. Piet Lammers
Euphorbia pulcherrima Willd. ex Klotzsch x Euphorbia cornastra (Dressler) Radcl.-Sm.
JACOBSEN PETER
Gerbera jamesonii Bolus ex Hook. f. · Barberton daisy
Specjalistyczne Gospodarstwo Ogrodnicze SARA A.A. Świech
Gerbera jamesonii Bolus ex Hook. f. · Barberton daisy
Gerbera Nisters
Gossypium hirsutum L. · Upland cotton
CHEMBRED INC.
Chrysanthemum L. · Chrysanthemum
Mark A. Smith
Chrysanthemum L. · Chrysanthemum
Cleangro Ltd
Chrysanthemum L. · Chrysanthemum
Mark A. Smith
Chrysanthemum L. · Chrysanthemum
Cleangro Ltd
Bouvardia longiflora (Cav.) Kunth
Gossypium hirsutum L. · Upland cotton
Solanum lycopersicum L. · Tomato
Solanum lycopersicum L. · Tomato