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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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Online at: http://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
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 > OK-Net Arable
Related Links:http://farmknowledge.org/index.php/search-for-ok-tools?v=31592
Project ID:oknet
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:31592
Deposited On:24 May 2017 07:50
Last Modified:29 May 2017 07:31
Document Language:English, German/Deutsch
Status:Published

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