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
10 Sep 2026
The 16in1 SSR system improves sweet cherry genotyping by strengthening varietal identification, parentage analysis and breeding. Tested on European and North American cultivars, it delivers far greater discriminatory power than the ECPGR marker set in laboratory use.
17 Dec 2025
A Spain-Denmark study reveals the molecular pathways behind sweet cherry bud dormancy release. The research highlights the roles of hydrogen cyanamide, jasmonates and cytokinins in helping fruit trees adapt to climate change effects on flowering.
11 Nov 2026
South Africa’s cherry harvest season began two to three weeks early, but production in Ceres could fall by over 50%. Heat and cold during flowering affected fruit set. Early cherries reach 30 mm, while Tru-Cape aims to increase exports from 15% to nearly 20% of its crop.
11 Nov 2026
Nel 2026 l’Estremadura approva 19,59 milioni di euro di aiuti per cereali, ciliegie e apicoltura: fino a 50 euro per ettaro irriguo, 1.500 euro per ettaro di ciliegio e 18 euro per alveare. Le pratiche saranno avviate d’ufficio e i pagamenti sono previsti entro fine anno.
