Pests
Aphididae
Aphids are sap-sucking pests that cause leaf deformation, stunted plant growth, and reduced productivity. They also act as vectors for viral infections and facilitate the growth of sooty mold on the honeydew they secrete.
Mentioned in descriptions 6 810 varieties reference book.
Aphids are small sap-sucking pests that deplete plant cell sap during feeding, inhibiting photosynthesis and protein synthesis. Infestation manifests as leaf curling and deformation, the appearance of galls, premature leaf drop, and general suppression of shoots. The pest is diagnosed by colonies on the underside of leaves, the presence of a sticky honeydew coating, and ant activity.
Varietal resistance to aphids is classified as high (HR), which restricts pest development, or intermediate (IR), which can manage infestation under moderate pressure. The effectiveness of varietal protection depends on the type of mechanisms: vertical, which provides specific immunity to certain races, or horizontal, which creates general buffer resistance through the plant's physiological and biochemical properties.
Resistance assessment is a dynamic characteristic, as pests evolve by overcoming race-specific resistance genes. To maintain stability, agronomists apply the rotation of varieties with different resistance genes and combine their use in mixtures, avoiding monoculture with identical characteristics on the same land areas over long periods.
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.
Rubus L. · Blackberry
HAEBERLI| Haeberli Obst- und Beerenzentrum AG
Rubus L. · Blackberry
HAEBERLI| Haeberli Obst- und Beerenzentrum AG
Allium L. · Ornamental Allium
Mellema-Versteeg B.V.
Chrysanthemum indicum L. · Indian chrysanthemum
W. John LAYNG (US)
Rubus L. · Blackberry
PROPLANT| Proplant AG
Lactuca sativa L. var. capitata L. · Head lettuce
Ger Beemsterboer
Chrysanthemum x morifolium Ramat. · Florist's daisy
LAYNG| W. John Layng c/o Layng and Company Greenhouses
Sorghum bicolor (L.) Moench subsp. bicolor · Sorghum
TEXAS AGR. EXP. STATION (US)
Rubus L. · Blackberry
Dr. Rudolf Bauer (+)
Sorghum bicolor (L.) Moench subsp. bicolor · Sorghum
Sud Cereales (FR)
Triticum aestivum L. · Bread wheat
Davydiuk Hanna Volodymyrivna, Kovalchuk Serhii Oleksandrovych, Klymenko Iryna Ivanivna, Zaika IEvhenii Viktorovych, Hirko Oleksandr Volodymyrovych, Tkachova Natalia Andriivna, Starychenko Vasyl Mykolaiovych, Holyk Liubov Mykolaivna,
Begonia L. · Begonia
REVELL| John Revell
Lactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
Malus domestica (Suckow) Borkh. · Apple
Andreas Peil, Crista Fischer,
Calendula officinalis L. · Pot marigold
Krakowska Hodowla i Nasiennictwo Ogrodnicze POLAN sp. z o.o.
Lactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
Monarda fistulosa L. · Bee balm
Khlypenko Liudmyla Anatoliivna, Svydenko Liudmyla Viktorivna, Rabotiahov Valerii Dmytrovych, Fedorchuk Mykhailo Ivanovych, Derev'ianko Vasyl` Mykolaiovych,
Beta vulgaris Sugar Beet Group · Sugar beet
KUTNOWSKA HODOWLA BURAKA CUKROWEGO Sp.z o.o.
Lactuca sativa L. · Lettuce
Tezier SA (FR)
Lactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
Lactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
Prunus persica (L.) Batsch · Peach
Budzynskyi Oleksandr Serhiiovych,Yarmoliuk Ivan Savych,
Lactuca sativa L. var. crispa L. · Leaf lettuce
Kees Reinink
Lactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.