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Control of summer fruit tortrix (Leafrollers) (BIOFRUITNET Practice Abstract)

{Tool} Control of summer fruit tortrix (Leafrollers) (BIOFRUITNET Practice Abstract). Creator(s): Lindhard Pedersen, Hanne. Issuing Organisation(s): HortiAdvice. Biofruitnet Practice Abstract, no. 016. (2023)

[thumbnail of Control of summer fruit tortrix (Leafrollers)] PDF - Published Version - English (Control of summer fruit tortrix (Leafrollers))
[thumbnail of Bekæmpelse af bladviklere (Sene viklere)] PDF - Published Version - Danish/Dansk (Bekæmpelse af bladviklere (Sene viklere))

Document available online at: https://orgprints.org/45939

Summary in the original language of the document

Pheromone disruption, eventually in combination with Bt-products (Bacillus thuringiensis) or Capex, are important to reduce fruit damage by leafroller larvae and thereby increase the saleable yield and storability of the fruits.
Practical recommendations
• Look at the level of damage on harvested fruit from the previous season to estimate the potential damage (Picture 3).
• Establish 800-1000 Isomate dispensers/ha as high in the orchard as possible. The high location is important for an optimal distribution of the pheromones by the wind in the orchard, and thereby optimises the effect of the treatment.
• The optimal distribution of the dispensers in the orchard are evenly in a square pattern of 3.5 x 3.5 meters over the entire treated area.
• In the outermost twenty meters of the orchard, the distribution of pheromones is especially affected by the wind. Therefore, it is necessary to conduct an edge treatment by hanging one dispenser in each end tree in each row, as well as to double the number of dispensers in the outermost rows.
• When treating areas that are smaller than 3-4 ha, there is a considerable risk of the infestation from mated females from untreated neighbouring areas.
• If the initial infestation with summer fruit tortrix is high, use additional application of Capex in spring.
• Monitor the occurrence of the leafroller species in spring. If you find relevant species that are not covered by the pheromone disruption Isomate CLR, such as Hedya nubiferana and Spilonota ocellana, apply Bacillus thuringiensis.

EPrint Type:Practice tool
What problem does the tool address?:The larvae of many species of leafrollers (tortrix), feed on the leaves and fruits of apples and pears. The leafrollers are polyphagous, meaning they can feed on various kinds of food. Most species hibernate as larvae and damage flowers and fruitlets in May and fruits short before harvest.
What solution does the tool offer?:Pheromone disruption can decrease the reproduction of leafrollers and prevent damage to fruits. However, not all relevant species are included in the pheromone, these species larvae must be controlled on a warm, dry, cloudy day just before or during flowering using Bt-products. To control the summer fruit tortrix, the selective granulovirus (Capex 2) can be used in combination with disruption to reduce the infestation pressure.
Type of Practice Tool:Practice abstracts
Keywords:Pest control, biological control, leafrollers
Agrovoc keywords:
pest control
biological control
Subjects: Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation: European Union > Horizon 2020 > Biofruitnet
Denmark > Other organizations Denmark
European Union > Organic Farm Knowledge
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/45939, https://biofruitnet.eu
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:45939
Deposited On:25 Apr 2023 12:22
Last Modified:02 May 2024 10:32
Document Language:English, Danish/Dansk

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