A spotted wing drosophila larva can feed inside fruit, out of sight until a berry is cut or softens in the pack. The fly’s ability to attack intact, ripening fruit is part of what makes it troublesome in soft-fruit production.
A study by Baria Choudry, Anna Durance, Tahia Ibtisam and Tom Kim looks at a different point in that hidden life: the larval gut. The authors describe spotted wing drosophila as an introduced pest of berries and other soft-skinned fruits in North America, and say current chemical tools leave room for more effective, specific controls.
A bacterium on the menu
The candidate is Pseudomonas protegens CHA0, a strain of a bacterial group the authors describe as beneficial to plants and known to have insecticidal properties. That makes it an interesting research subject, not a ready-made berry treatment.
The question in the paper is whether the bacterium is toxic to spotted wing drosophila larvae when they take it in orally. That route matters: it asks about exposure through feeding, rather than relying on contact alone.
The abstract excerpt available with the research record stops before giving the results. It does not state whether CHA0 killed larvae, how much was needed, or whether any effect was selective for the pest.
A promising premise, not a field recommendation
For berry operations, the gap between a toxicity test and a usable control is a substantial one. A finding in larvae would still need to be read alongside details such as dose, exposure conditions, effects on beneficial insects, and performance in a crop setting; the supplied abstract does not answer those questions.
The study raises a biologically based avenue for research, but it provides no basis on its own for changing California berry pest programs. The practical value will depend on what the full paper reports and whether later work establishes a safe, repeatable way to use the bacterium around fruit.