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 Leaf lettuce 13 Maize 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.

85 85 RZ

Terminated

Lactuca sativa L. · Lettuce

RIJK ZWAAN Z.Z. B.V.

1 record

ACTINA

Application submitted

Lactuca sativa L. var. crispa L. · Leaf lettuce

Miguel Roca

2 records

Zelzate

Terminated

Tilia platyphyllos Scop.

Martelaer F.V.

1 record

85 76 RZ

Withdrawn

Lactuca sativa L. · Lettuce

RIJK ZWAAN Z.Z. B.V.

1 record

ZO16170

Active

Clematis L. · Clematis

J.VAN ZOEST BEHEER B.V.

1 record

Akvilon F1

Protection expired

Brassica oleracea L. (White Cabbage Group) · White cabbage

Monakhos Hryhorii Fedorovych

2 records

43 94 RZ

Withdrawn

Lactuca sativa L. · Lettuce

RIJK ZWAAN Z.Z. B.V.

1 record

Abilene

Application submitted

Cucumis melo L. · Melon

Enza Zaden Beheer B.V.

2 records

45-84 RZ

Active

Lactuca sativa L. · Lettuce

RIJK ZWAAN Z.Z. B.V.

1 record

45-140

Active

Lactuca sativa L. var. capitata L. · Head lettuce

Kees Reinink

1 record

83 06 RZ

Withdrawn

Lactuca sativa L. · Lettuce

RIJK ZWAAN Z.Z. B.V.

1 record

Yomorgan

Terminated

Chrysanthemum L. · Chrysanthemum

PETER WAIN

1 record

43 38 RZ

Withdrawn

Lactuca sativa L. · Lettuce

RIJK ZWAAN Z.Z. B.V.

1 record

34 213 RZ

Withdrawn

Cucumis melo L. · Melon

RIJK ZWAAN Z.Z. B.V.

1 record

TOSTD0194

Active

Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium

Floha V.O.F

1 record

Tango

Application submitted

Populus x canadensis Moench · Carolina poplar

Laura Rosso^^^Franco Picco^^^Pier Mario Chiarabaglio^^^Massimo Gennaro^^^Sara Bergante^^^Andrea Carra^^^Achille Giorcelli^^^Gianni Allegro^^^Giuseppe Nervo^^^Lorenzo Vietto

1 record

Tortola

Withdrawn

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

1 record

VOLAN7081

Active

Lantana camara L. · Lantana

Volmary Ltd

1 record

Sunny Yoursula

Terminated

Chrysanthemum L. · Chrysanthemum

Mark A. Smith

1 record

SH 1923

Withdrawn

Saxifraga cortusifolia Siebold & Zucc.

Josef Heuger

1 record

SPICWIRL

Withdrawn

Chamaecyparis lawsoniana (A. Murray bis) Parl. · Lawson's cypress

Carole Spicer^^^Derek Spicer

1 record

Sene Nina 55

Application submitted

Pericallis x hybrida (Scheidw.) B. Nord. · Cineraria

Kiyoshi Miyazaki

1 record

Skjold

Terminated

Tilia cordata Mill. · Small-leaved lime

University of Aarhus - Aarslev

1 record

Serenade

Withdrawn

Argyranthemum frutescens (L.) Sch. Bip. · Marguerite daisy

L.M.S. ApS

1 record

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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.