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Eerste bladluizen gesignaleerd: wekelijks waarnemen belangrijk

Luis Suikerbieten zaaien

Eerste bladluizen gesignaleerd: wekelijks waarnemen belangrijk

De eerste groene bladluizen en zwarte bonenluizen zijn al gesignaleerd op bietenpercelen. Van de groene bladluizen is de groene perzikluis de belangrijkste overbrenger van vergelingsvirussen. Zwarte bonenluizen veroorzaken zuigschade.

Daarom is er voor beide soorten bladluizen een aparte schadedrempel. Lees meer in dit IRS-bericht over de schadedrempels en de beheersingsmogelijkheden bij overschrijding van deze schadedrempels.

Bepalen of schadedrempel is overschreden

Op enkele bietenpercelen is de schadedrempel van de groene bladluizen al overschreden. Dit is te zien op de ‘Bladluiswaarschuwingskaart’. Tel wekelijks op minimaal twintig bietenplanten per perceel het aantal bladluizen om te kijken of één van de twee schadedrempels overschreden is. Kies de planten redelijk verspreid over het perceel, maar vergeet daarbij zeker niet de luwtes (onder bomen, achter dijken, etc.) en plekken waar de bieten gaterig staan.

Groene bladluizen

De schadedrempel van de groene bladluizen ligt veel lager dan die van de zwarte bonenluizen. Dit komt doordat groene bladluizen virus kunnen overbrengen en zwarte bonenluizen zuigschade veroorzaken. Bij het tellen van de bladluizen is het daarom belangrijk deze twee soorten apart te beoordelen.

Zodra één van beide schadedrempels is overschreden, is het advies om een bespuiting uit te voeren.

Tabel 1. Schadedrempels van de groene bladluizen.

periodeaantal groene bladluizen per tien planten
april, mei en eerste helft junimeer dan twee
tweede helft junimeer dan vijf
eerste helft julimeer dan vijftig

Tabel 2. Schadedrempels van de zwarte bonenluis.

maandaantal zwarte bonenluizen
april/mei/junimeer dan 50% van de planten bezet met kolonies van dertig tot vijftig luizen
julimeer dan 75% van de planten bezet met grote kolonies van meer dan 200 luizen per plant

Bladluizen herkennen belangrijk

Groene bladluizen zitten vooral in het hart van de planten, aan de onderzijde en in de opgekrulde bladrandjes. Het is daarom belangrijk de gekrulde bladranden voorzichtig open te rollen bij het tellen van de bladluizen, anders worden ze makkelijk over het hoofd gezien. De zwarte bonenluis is een bladluis, die hoofdzakelijk zuigschade veroorzaakt, waardoor hele bladeren omkrullen. Deze bladluis bevindt zich meestal ook aan de onderzijde en kan kolonies vormen. Jonge zwarte bonenluizen zijn in het begin donkergrijs en nog niet zwart. Daardoor worden ze makkelijk verward met groene bladluizen.

Vermijd gebruik pyrethroïden

Voor de bestrijding van bladluizen, waaronder ook de zwarte bonenluis, dient nooit gebruik te zijn gemaakt van pyrethroïden (Decis, Decis Protech, Karate Zeon, Ninja of Sumicidin Super), aangezien deze middelen alleen werken als de insecten direct geraakt zijn. Omdat bladluizen zich aan de onderzijde van de bladeren bevinden, kunnen ze niet direct geraakt zijn en werken deze middelen dus niet. Helaas doden deze middelen wel de natuurlijke vijanden van de bladluizen, waardoor bladluispopulaties alleen maar sneller zullen groeien.

Geadviseerde insecticiden

Geadviseerde insecticiden* bij overschrijding van de schadedrempel van bladluizen. Vanwege resistenties van de groene perzikluis voor Pirimor, wordt Pirimor alleen geadviseerd bij aanwezigheid van zwarte bonenluizen.

insecticidewerkzame stofdoseringopmerking
Teppeki, Afinto, Inter Peki WGflonicamid0,14 kg/haKan alleen worden toegepast tot het tienbladstadium (niet na 1 juni), i.v.m. kans op overschrijding van de MRL.
Pirimorpirimicarb0,4 kg/haAlleen toepassen als temperatuur hoger is dan 20°C en bij voorkeur bij windstil weer ten behoeve van optimale dampwerking. Groene perzikluizen zijn resistent, dit geldt niet voor zwarte bonenluizen. Op percelen die grenzen aan watergangen dient gebruik gemaakt te worden van een teeltvrije zone van 0,75 meter in combinatie met minimaal 90% driftreducerende doppen of een van de andere maatregelen zoals vermeld op het etiket.
***Inzet andere middelen is afhankelijk van een eventuele vrijstelling.

*op het moment van schrijven (17 april 2025) was er nog niets bekend over de eventuele vrijstellingen van insecticiden voor de beheersing van bladluizen in suikerbieten. Mogelijk kunnen telers dus later in het seizoen nog andere insecticiden gebruiken.

Meer informatie

Meer informatie over bladluizen kunt u vinden in de IRS-Teelthandleiding ‘Insecten’. Meer actuele informatie over groene bladluizen is ook te vinden in de IRS-berichten over de ‘Bladluiswaarschuwingsdienst’.

Bron en beeld: IRS

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