Drosophila suzukii, one of the main pests of the cherry tree, is capable of causing considerable damage every year and needs to be controlled as effectively as possible. To achieve this, it is useful to start with the basics: knowing and understanding its behaviour.
We can compare D. suzukii to a tourist, moving from field to field in response to the supply of fruit and energy available to survive the winter. The key factors influencing the intensity of the attack are therefore two: the availability of fruit throughout the year and the conditions for hibernation.
Numerous studies in the USA and Argentina have shown that the insect tends to abandon orchards during certain times of the year, taking refuge in non-cultivated areas and then returning in the following spring. This behaviour has also been confirmed in Chile, thanks to data collected with monitoring traps in the Maule area and other cherry-growing areas.
It was also found that in the 2023-2024 season, cherry orchards located near water sources and surrounded by hills faced increased pressure from this insect. To predict and manage the intensity with which this insect may attack, early detection of population fluctuations is necessary.
It is therefore with monitoring that the pressure of Drosophila suzukii can be anticipated, as it provides valid data on the presence and evolution of the insect. Cherry producers must therefore participate in monitoring networks or, alternatively, install trap systems themselves.
Indeed, the return of the insect during the following year depends on:
When the presence of the insect is detected, action must then be taken to control it. The control of D. suzukii requires a multifactorial strategy that combines insecticide application with cultural management practices. In general, at least 4 applications of specific insecticide from veraison to harvest are recommended.
The Agricultural and Livestock Service of Chile has authorised a wide range of insecticides valid for Drosophila control, offering various options of different chemical groups to avoid the emergence of resistance phenomena. The effectiveness of control techniques depends on various factors, including the application of the correct dose of product and proper orchard management. Some factors that may compromise fruit protection are:
The management of Drosophila suzukii in cherry trees requires the combination of knowledge of the insect's behaviour with the implementation of control tools that are adapted to local conditions. Anticipation, constant monitoring and flexibility in adjusting control techniques are essential to protect crops and ensure quality at harvest. With a proactive and data-driven approach, producers can effectively tackle this persistent threat, ensuring sustainability and profitability of their cherry production.
Fonte: Cherry Magazine
Immagine: WSU
Melissa Venturi
University of Bologna (IT)
10 Aug 2023
The CrackSense project, coordinated by the research institute Volcani Center (Israel), was initiated in 2023. Its ambition is to better understand and predict the complex phenomenon of fruit cracking, a major agronomic problem, at the fruit, tree and plot level.
15 May 2024
A survey conducted at the beginning of May among the main industry players predicts a below-average production in 2024 of between 50 and 60 thousand tonnes around +/- 10% compared to last year's production, with negative estimates prevailing.
04 Feb 2025
Studied between Chilean and Israeli institutes have analyzed the function of pattern-triggered immunity in sweet cherry, induced by the fungal elicitor Xyn11/eix, was analysed. The results show that Xyn11/eix induces two distinct responses: cell death and ethylene increase.
04 Feb 2025
Meda™ varieties have been evaluated in Europe for three seasons now. All have been selected with a minimum of 35-40 days post-harvest. Meda™'s is the only breeding programme that has used postharvest as a selection filter.
