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Belgium | Biological control
Andersoni-System, ideal for Spanish raspberries In southwestern Spain, this Biobest product has proven its worth and is playing an increasing role in the prevention and control of a wide range of raspberry mites. 10/28/2020
 Raspberries.
Raspberry cultivation in southwestern Spain is usually remontant, that is, with two harvest cycles a year. Farmers in the area usually overlap two crops in different stages to maintain constant production, with a cycle pruned before and a new one planted at the beginning of the season. Thanks to this cultivation technique, raspberry producers in Spain have managed to extend the harvest calendar from October to July. The spider mite, a key challenge in raspberry One of the most important pests of raspberries in Spain is the red spider. "The control strategies are focused on making preventive releases of Andersoni-System in combination with Phytoseiulus-System and Swirskii-System", details Miguel Claros, Biobest technician. “Our strategy includes introducing the Andersoni-System later in the campaign to increase control, together with Feltiella-System and Phytoseiulus-System. Preventive control “In addition to feeding on various pest mites, andersoni also feeds on pollen. This translates into an effective installation in the crop in a preventive way, helping to generate a substantial population in the crop before the pest can spread ”. It is an extremely efficient predatory mite. Andersoni nymphs prefer to feed on the eggs and young stages of the spider mite, as well as the red fruit spider, the red Lewis spider and others; whereas the adults can prey all the stages of plague. High mobility "Andersoni also benefits from its high mobility", explains María Parra, a Biobest technician. “It can spread quickly and easily on raspberry crops, especially when the leaves touch each other. Under normal conditions, this predator also has a shorter life cycle. It takes only 7-8 days at 21ºC to complete a cycle, so it has the ability to create a population faster than the pest itself. Resistance to thermal contrasts At low temperatures, the mites go into diapause (hibernation), emerging again when conditions improve. This means that they can remain lethargic in the crop, waiting for the best moment from one crop cycle to the next. Last but not least, our Andersoni-System can successfully withstand large temperature contrasts, with temperatures as low as 6ºC and as high as 35ºC. "Well adapted as it is to our conditions in southwestern Spain, our Andersoni-System has proven its worth and is playing an increasing role in the prevention and control of a wide range of pest mites in raspberry".
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