In California, Drosophila suzukii, known as SWD, is developing increasing resistance to insecticides. This insect has become a problem for cherry, sugar cane and strawberry growers since its arrival in 2008, spreading to other states in the USA, Mexico and Europe.
SWD females, thanks to their serrated ovipositor, can even lay their eggs in hard-skinned fruits, damaging them. This leads to increased susceptibility to insects and diseases, as pointed out by the University of Minnesota Extension.
Entomologist Jhalindra Rijal conducted studies on SWD in cherries and revealed that resistance problems developed rapidly. Management practices based on spinosin, pyrethroids and malathion contributed to this resistance due to the limited use of active ingredients.
The inability to vary active ingredients has led to increasing resistance among SWD populations, not only in California but also in other regions of the US, such as Georgia and Michigan, which have experienced similar problems. Scientific studies have shown a significant decrease in the susceptibility of SWD adults to various insecticides, resulting in lower than expected mortality. Spinosad resistance has been widespread on the Central Coast.
Fonte: Farm Progress
Foto: Italian Berry
22 Aug 2023
Oxley Farms, helmed by Ed, Chris, and Rick Oxley, operates a 250-acre tart cherry orchard in Lawton, Michigan. They embarked on the creation of a unique machine, drawing inspiration from harvesters used in grape, blueberry, cherry, and coffee production.
18 Feb 2025
The problem does not only concern Michigan. According to economist Ernie Goss, farms across the country are facing similar difficulties, with some regions, such as the Midwest, facing the onset of an agricultural recession.
21 Jul 2026
INDUSER and ICOEL strengthen Italy’s fresh produce industry through a strategic alliance focused on automation, associative weighing and multi-format packaging. The partnership combines technology, local support and solutions for cherries, blueberries and other produce.
21 Jul 2026
In Norway, growing sweet cherries in containers under high-density tunnels delivers strong yields and cultivar-specific quality. The study compares fertigation with slow-release fertilizers on Van, Lapins and Regina, highlighting distinct responses in fruit composition.
