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.

Tannin

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer

6 records

Thea

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

6 records

Takoda

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

5 records

Teragon

Terminated

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Tercius

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Takita

Active

Lactuca sativa L. · Lettuce

Syngenta Seeds B.V.

7 records

Taco

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

6 records

Syderal

Active

Cucumis melo L. · Melon

Syngenta Seeds B.V.

5 records

Tilouka

Active

Cucumis melo L. · Melon

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

4 records

Thibo

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

6 records

Tatienne

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

5 records

Sylvesta

Active

Lactuca sativa L. · Lettuce

NUNHEMS ZADEN B.V.

5 records

Tanius

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Susana

Active

Lactuca sativa L. · Lettuce

NUNZA B.V.

4 records

SV3413LC

Active

Lactuca sativa L. · Lettuce

VEGETABLE MONSANTO B.V.

7 records

Sunshine 628

Active

Cucumis melo L. · Melon

Nunhems B.V.

3 records

Surfside

Application submitted

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V. / Enza Zaden Beheer B.V.

6 records

Tahamata

Terminated

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Stretcha

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

5 records

Sunshine

Active

Cucurbita maxima Duchesne · Giant pumpkin

Johnny's Selected Seeds

3 records

SV0001LB

Active

Lactuca sativa L. · Lettuce

Seminis Vegetable Seeds

5 records

Suyai

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Sumarnas

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Starsky

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

4 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.