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
13 Oct 2023
Read, consult and download the first issue of Cherry Times Magazine. Inside you can find all the major news, together with information and specific content on all sectors of the cherry industry!
08 Aug 2024
If we define plant health as a function of primary (growth) and secondary (defence) metabolisms, both share a common pool of cellular energy (CE). The presence of abiotic stress will shift the CE budget, from growth kinetic model to one that is focused on defence mechanism.
26 May 2026
A California field study shows how Brix and fruit skin firmness affect sweet cherry susceptibility to Drosophila suzukii. Cultivar differences, fruit color and ripening stage point to sharper integrated pest management decisions and lower infestation risk in California orchards.
26 May 2026
SAT La Rinconada cherries in Spain earn the Epigen Healthy Bite Regenerative Agriculture certification: 48 of 110 hectares focus on healthy sugars, more total amino acids, organic acids and antioxidant potential, while cutting water and nutrient use for European customers.
