Controlling potato beetles with Bt

{Tool} Controlling potato beetles with Bt. Creator(s): Dierauer, Hansueli; Weidmann, Gilles and Siegrist, Franziska. Issuing Organisation(s): Research Institute of Organic Agriculture FiBL. OK-Net Arable Practice Abstract, no. 031. (2017)

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PDF - German/Deutsch (Kartoffelkäfer mit Bt biologisch bekämpfen)
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Online at: https://orgprints.org/31592

Summary

Check the state of infestation
• When the potato plants start to emerge, walk the field every 7 days in a straight line and check plants at regular intervals.
• If clusters of eggs are found on more than every third plant, apply Novodor four days after discovering the first clusters.
Apply the agent
• Dissolve 5 l of Novodor in 500 l of water per hectare of potatoes.
• Novodor can be applied together with copper products.
Optimal conditions:
• The potato beetles are still in an early larval stage (L1 to L2).
• Temperature between 15 °C and 25 °C.
• Avoid direct sunlight: spray late in the evening or when the sky is overcast.
• No rain is due within 8 hours after spraying.
Comments
• After a successful treatment, the larvae will turn black after a few days.
• If the effect is insufficient, the larvae will stay mobile. In this case, the treatment should be repeated within the following 10 days.

Summary translation

Befallszustand kontrollieren
• Vom Zeitpunkt des Auflaufens der Kartoffelpflanzen an das Feld alle 7 Tage in einer geraden Linie traversieren und in regelmässigem Abstand eine Pflanze untersuchen.
• Sind an mehr als jeder dritten Staude Eigelege zu finden, 4 Tage nach dem Finden der ersten Eigelege Novodor anwenden.
Wirkstoff ausbringen
• Pro Hektare Kartoffeln 5 l Novodor in 500 l Wasser auflösen.
• Novodor kann mit Kupferpräparaten zusammen ausgebracht werden.
Optimale Bedingungen:
• Die Kartoffelkäfer befinden sich in einem frühen Larvenstadium (L1 bis L2).
• Temperatur zwischen 15 °C und 25 °C.
• Kein direktes Sonnenlicht, deshalb Spritzung spätabends oder bei bedecktem Himmel ausführen.
• Kein Regen während 8 Stunden nach der Spritzung.
Bemerkungen
• Nach erfolgreicher Behandlung färben sich die Larven nach einigen Tagen schwarz.
• Bei ungenügender Wirkung bleiben die Larven mobil. In diesem Fall sollte die Behandlung innerhalb der nächsten 10 Tage wiederholt werden.

EPrint Type:

Practice tool

What problem does the tool address?:

Potato beetles can develop rapidly, especially in warm summers on late-maturing crops, causing extensive damage to the potato plants.

What solution does the tool offer?:

In the case of a large infestation, direct control measures e.g. the use of biological plant protection products like Novodor are justified. Novodor contains a bacterium; Bacillus thuringuensis tenebrionis (Bt), whose toxins (protein crystals) destroy the intestinal tract of potato beetle larvae.

Country:

Switzerland

Type of Practice Tool:

Practice abstracts

Theme:

Pest and disease control

Keywords:

arable farming, crop species, pest control

Keywords:

arable farming, crop species, pest control

Agrovoc keywords:

Language	Value	URI
English	arable farming	http://aims.fao.org/aos/agrovoc/c_36528
English	crops	http://aims.fao.org/aos/agrovoc/c_1972
English	pest control	http://aims.fao.org/aos/agrovoc/c_5726
English	disease control	http://aims.fao.org/aos/agrovoc/c_2327
English	potatoes	http://aims.fao.org/aos/agrovoc/c_13551

Subjects:

Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Root crops

Research affiliation:

Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Communication
European Union > Horizon 2020 > OK-Net Arable