Pests

Aphids

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.

Sources10

Breakdown by crop

Lettuce aphid 1 326 Melon Aphid on Melon 220 Apple Aphids 85 Apple Aphid 44 Aphids on Raspberry 43 Alfalfa Aphid 35 Aphids on soft wheat 16 Aphids on Lettuce 13 Aphids on Barley 13 Aphids on Paradise Apple 12 Sorghum aphid 11 Peach aphid 10 Aphid — Red Currant 10 Chrysanthemum aphid 10 Hop aphid on hops 9 Aphids on faba beans 9 Aphids on Faba Beans 9 Pea aphid on peas 9 Aphids on carrot 9 Aphids — White Cabbage 8 Aphid infestation of Canadian poplar 8 Black Cherry Aphid — Sour Cherry 7 Cabbage aphid on rapeseed 7 Aphids on Sugar Beet 7

Found in these crops

Lettuce 1 340 Melon 220 Apple 85 Apple 44 Red raspberry 41 Alfalfa 35 Bread wheat 17 Barley 14 Maize 13 Leaf lettuce 13 Paradise apple 12 Sorghum 11

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.

Lukasz

Active

Lactuca sativa L. · Lettuce

NUNHEMS

7 records

Mayoral

Active

Lactuca sativa L. · Lettuce

Nunhems, B.V.

7 records

Macaï

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan, NL

6 records

Lynelle

Active

Lactuca sativa L. · Lettuce

Nunhems B.V., 6083 AB Nunhem

6 records

Lianabel

Active

Lactuca sativa L. · Lettuce

Bejo Zaden, NL

9 records

Lumirex

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

7 records

Lorenzo

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

6 records

Lobela

Active

Lactuca sativa L. · Lettuce

Enza Zaden, NL

7 records

L70

Active

Medicago sativa L. · Alfalfa

Tom Damin, Pasture Genetics Pty Ltd

5 records

Lilybel

Active

Lactuca sativa L. · Lettuce

BEJO ZADEN

10 records

Krilda

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

5 records

Lennita II

Active

Lactuca sativa L. · Lettuce

Syngenta Crop Protection AG

7 records

Langero

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Kingita

Active

Lactuca sativa L. · Lettuce

Syngenta Seeds B.V.

10 records

Kireve

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

6 records

Kavalo

Active

Lactuca sativa L. · Lettuce

Syngenta Seeds B.V.

8 records

Kanyon

Active

Capsicum annuum L. · Bell pepper

Nunhems B.V.

7 records

Jonction

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

5 records

Kiprien

Terminated

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V, Rijk Zwaan Lettuce Breeding department

6 records

Kintelmo

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

7 records

Judita

Protection expired

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

5 records

Kalat

Active

Lactuca sativa L. · Lettuce

Yes, RIJK Zwaan lettuce breeding department

7 records

Izigo

Active

Lactuca sativa L. · Lettuce

Syngenta Seeds B.V.

6 records

Invicta

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

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Pests

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.