Context-dependent Effects of Fosthiazate on Soil Nematode Communities and Soil Properties in Guava Orchards with Contrasting Nematode Infestation Histories

Thippawan Korsrisakul, Natthidech Beesa, Phornthawon Phanbut, Anongnuch Sasnarukkit, Buncha Chinnasri, Arunee Suwanngam

Abstract

Fosthiazate is widely used to control plant-parasitic nematodes in perennial orchards; however, its ecological effects on non-target soil communities may depend on baseline soil conditions. This study evaluated the short-term impacts of fosthiazate on soil nematode communities and soil physicochemical properties in two guava (Psidium guajava L.) orchards with contrasting Meloidogyne enterolobii infestation histories. Treatments included an untreated control, the recommended rate (2 kg a.i. ha⁻¹), and a high rate (3 kg a.i. ha⁻¹), with sampling conducted before and 1.5- and 3-months after application. Fosthiazate induced dose- and time-dependent changes in both orchards, but responses differed between infestation histories. In the non-infested orchard, higher rates were associated with relatively stable ecological indices and maintenance of higher trophic groups. In contrast, the infested orchard exhibited reduced enrichment and structure indices together with greater temporal variability in nematode community composition, indicating a comparatively simplified soil food web. Multivariate analyses revealed that community shifts were associated primarily with soil organic matter, total nitrogen, and available phosphorus in the non-infested orchard, whereas soil pH and physicochemical constraints were more strongly associated with community variation in the infested orchard. These findings demonstrate that the ecological effects of fosthiazate vary according to pre-existing soil conditions and nematode infestation history. Incorporating nematode-based ecological indicators into nematicide management may support more sustainable and ecologically informed pest management strategies in perennial orchard systems.

Keywords

References

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DOI: 10.14416/j.asep.2026.07.016

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