Control Bean Seed Fly with Beneficial Nematodes
Onions are a common crop worldwide, but their cultivation is often challenged by onion fly (Delia antiqua). The larvae of the onion fly can cause significant damage to the roots and bulbs of onions and related plants, sometimes even killing seedlings. To combat this threat, growers are using beneficial nematodes as a crucial biological control solution. Michiel Bouma, an onion grower in Rutten (NL), is one such grower who has witnessed the positive impact of these beneficial nematodes.
The challenge of onion fly infestation
Michiel's primary challenge is the Delia antiqua, female onion flies lay their eggs near the base of onion plants. Hatching from the eggs, the larvae crawl behind the leaf sheaths to enter the bulbs, where they feed and cause internal damage. This damage compromises the quality and yield of the harvest. If left uncontrolled, these larvae can even kill young seedlings, resulting in production losses early in the cultivation process.
The larval stage is the most dangerous stage for the plants, as the larvae feed extensively. Once the initial host plants are damaged, the larvae move from one plant to another, increasing the risk of widespread infestation and crop losses. An onion fly infestation can result in significant economic losses, as damaged bulbs have lower commercial value or may even become unsuitable for sale. Therefore, Integrated Pest Management (IPM) strategies must be proactive and effective due to the rapid onset of damage.
Effective control with Capirel
After Michiel witnessed the success of biological control with beneficial nematodes, he is convinced it was crucial in saving his crop from onion fly damage. This year, he has proactively treated all his onions with Capirel (Steinernema feltiae).
Beneficial nematodes parasitize Delia antiqua larvae. They enter the host's body cavity and release symbiotic bacteria that break down the host tissue, providing sustenance for nematode growth and reproduction. This ultimately results in the death of the pest within a short period. Additionally, Capirel is easy to apply, it can be sprayed or injected via irrigation, offering flexibility to fit growing operations.
A healthy onion harvest with Capirel
Michiel Bouma is highly satisfied with the results achieved using Capirel and recommends all growers to consider using beneficial nematodes. He emphasizes that by reducing pest pressure, growers can achieve a good harvest yield. Effective control of the onion fly ensures that the harvested onion bulbs are free from damage and of high quality, which is essential to meet market demands.
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