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
16 Oct 2024
Developed by the international breeding company Bloom Fresh, the low-temperature varieties have been planted with the hope of increasing supply to meet the appetite of Australians and exports for these festive fruits.
04 Mar 2025
For the first time, Rhizobium rhizogenes has been identified as a pathogenic agent of crown gall in Chile. Crown gall is a disease causing tumorous deformations in plant tissues and significant economic losses, particularly in nurseries.
09 Apr 2026
A study conducted in Chile evaluates chemical thinning in cherry trees using TSA and ACC, compared with manual methods. Results highlight impacts on fruit set, quality and size, offering practical insights for improving orchard productivity and efficiency.
09 Apr 2026
At the IFTA conference in California, new technologies for cherry and stone fruit orchards highlight benefits and limits. From automation and planar systems to growth regulators, growers assess costs, yields and sustainability to improve quality and market competitiveness.
