Insecticide Resistance in Indian Vegetable Ecosystems: A Critical Appraisal of Toxicological Mechanisms, Resistance Frequencies and Control Options

Evolutionary Toxicology of Insecticide Resistance in Indian Cereal Ecosystems: A Critical Appraisal of Selection Regimes, Mechanistic Evidence and Management Inference

Insecticide resistance in the pest complexes of rice, wheat, maize and stored cereals represents one of the most consequential evolutionary responses to human chemical intervention in South Asian agriculture, yet the evidence supporting resistance management decisions in India remains uneven in both quality and coverage. This review evaluates critically the state of knowledge on the evolutionary toxicology of insecticide resistance in Indian cereal ecosystems, treating resistance as the outcome of quantifiable evolutionary parameters rather than as a descriptive property of pest populations. Literature was identified through open scholarly indexes and metadata registries, supplemented by citation searching, and appraised for design adequacy, mechanistic depth, geographical relevance and evidential alignment with the claims made. Four analytical themes are developed. First, the selection landscape of Indian cereal systems is characterised by near-continuous host availability, short generation times, extensive dispersal and a narrowing set of effective modes of action, a combination that theory predicts should accelerate adaptation. Second, mechanistic understanding of field-evolved resistance in rice planthoppers, stem borers and stored-grain beetles derives predominantly from East Asian, Brazilian and Australian laboratories, so that mechanisms are frequently assumed rather than demonstrated for Indian populations. Third, phosphine resistance in stored cereals constitutes the clearest exception, since an India-specific dihydrolipoamide dehydrogenase variant has been characterised genetically and surveyed at high frequency in southern India. Fourth, the Indian field literature is dominated by short-term efficacy trials and single-season bioassays that cannot estimate allele frequencies, dominance, fitness costs or rates of change, which are precisely the parameters that resistance management strategies require. The principal unresolved questions concern the frequency and geographical structure of resistance alleles in Indian populations, the magnitude and modifiability of fitness costs, and whether recommended rotations achieve genuine heterogeneity of selection at the scale at which pests actually disperse. Resistance management in Indian cereals will remain provisional until longitudinal, genotype-based surveillance replaces episodic phenotypic screening.

Plant-parasitic Nematodes in Indian Agriculture: Risks, Dissemination Pathways and Mitigation Strategies

Plant-parasitic nematodes are a persistent yet inconsistently quantified biotic constraint in Indian cropping systems. A small number of national loss estimates circulate widely in the Indian literature, shape research priorities and are reproduced in the introductions of a large proportion of subsequent papers, yet the evidential structure of those estimates has rarely been examined. This review evaluates the strength, internal consistency and methodological adequacy of the published evidence on plant-parasitic nematodes in Indian agriculture, concentrating on four interlinked problems: the derivation and reliability of crop loss estimates; the changing composition of damaging species assemblages; diagnostic capacity; and the quality of evidence supporting management recommendations. Literature published between 2001 and May 2026 was identified through openly accessible bibliographic indexes and metadata registries, supplemented by backward citation tracking from recent reviews and by verification of bibliographic identity against publisher and registry records. The synthesis indicates that the most frequently cited national loss figure rests on aggregation of long-accumulated coordinated project data rather than on contemporaneous nationally representative sampling, and that the field-level studies which contribute to such aggregates typically rely on nematicide-based paired-plot designs whose treatment effects cannot be attributed to nematode suppression alone. The species assemblage causing economic damage appears to be shifting, with the rice root-knot nematode expanding in irrigated and aerobic rice systems and a virulent root-knot species recorded on an increasing range of hosts, although the underlying evidence consists largely of localised surveys and first reports that cannot establish rate of spread. Diagnostic capacity emerges as a rate-limiting constraint: morphological identification shows only moderate inter-observer agreement, and molecular and community-profiling methods remain concentrated in a small number of laboratories and are sensitive to methodological choices. Management evidence is strongly weighted towards short-duration pot and single-season trials, with limited multi-season field replication. Priorities include standardised loss assessment, distributed diagnostic capacity and durable field validation of biological and integrated approaches.

Insecticide resistance in Tuta absoluta: integrating dose–response assays analysis, diagnostic concentrations, and resistance management strategies

Beyond synergy: Integration of entomopathogenic fungi and botanicals as eco-friendly solutions for sustainable pest management

A review of combinatorial strategies, that leverage independent yet complementary modes of action, not only preventing the evolution of resistance but also increasing mortality, yielding significantly lower median lethal concentration (LC50) and median lethal time (LT50) values than those obtained with single agent treatments.

Heavy Metal Toxicity in Medicinal Solanaceae: A Critical Comparative Appraisal of Accumulation, Tolerance and Consequences for Herbal Quality

The Solanaceae supply several of the most heavily traded medicinal plants, among them Withania somnifera, Solanum nigrum, Datura stramonium, Hyoscyamus niger and Capsicum annuum, yet the same family contains taxa that accumulate cadmium and other potentially toxic elements to concentrations deliberately exploited in soil remediation. That dual identity generates a problem which has attracted surprisingly little integrated attention: the physiological traits making a species attractive for phytoextraction are largely the traits that compromise the safety of material harvested for medicinal use. This review critically appraises evidence on metal uptake, partitioning, tolerance and phytochemical consequences across medicinal Solanaceae, and evaluates how far current findings support inferences about the safety and consistency of herbal products. Literature was identified through structured searching of openly accessible scholarly indexes and metadata registries, supplemented by backward and forward citation tracking and by institutional sources, with a final search date of 10 June 2026. The retrieved evidence is dominated by short-term cadmium experiments on S. nigrum and Nicotiana tabacum conducted in hydroponic or pot systems, while the taxa most heavily traded as herbal raw material remain comparatively neglected. Mechanistic work converges on a limited set of processes, including non-selective root transport, xylem loading, cell-wall binding, vacuolar sequestration, glandular trichome secretion and thiol-dependent detoxification, but the quantitative contribution of each process is poorly resolved and has rarely been compared across species under common conditions. A recurring and under-acknowledged observation is that sub-lethal metal exposure alters concentrations of pharmacologically active constituents, including tropane alkaloids, in directions that are not reliably predictable from dose alone. Contamination surveys of finished products confirm exposure, yet most report total element concentrations without speciation, extraction behaviour or bioaccessibility, leaving the step from plant burden to human dose weakly supported. Research priorities include multi-species field comparisons under shared protocols, routine reporting of metal transfer into the extract phase, and explicit separation of accumulator germplasm from medicinal germplasm.

Essential Oils in Plant Protection in Europe: A Review of Efficacy and Limitations of Use

Essential oils are increasingly investigated for their potential use in plant protection because of their insecticidal, fumigant, repellent, behavioural, and antifungal activities. This narrative review with a structured literature search synthesizes evidence relevant to European plant protection, focusing primarily on stored-product pests, with additional consideration of pests and plant pathogens outside storage systems, stage-specific susceptibility, formulation, practical limitations, and the EU regulatory framework. EO efficacy was strongly influenced by chemical composition, concentration, formulation, exposure time, developmental stage, target species, and environmental conditions. The strongest evidence was identified for stored-product pests (Coleoptera), although stage-specific susceptibility varied among species. Under field conditions, the practical application of essential oils remains challenging due to their high volatility, short persistence, sensitivity to environmental conditions, potential phytotoxicity, formulation requirements, and limited field validation. Methodological differences among assay types also limit direct comparison across studies. In the EU, regulatory acceptance remains substance-specific, with whole essential oils assessed separately from their individual volatile constituents. Most available evidence is derived from laboratory studies, while greenhouse and field validation remains limited. No formal methodological quality or risk-of-bias assessment of individual studies was performed. Overall, essential oils should be regarded as complementary, application-specific tools whose contribution to more sustainable plant protection depends on improved standardization, formulation, field validation, safety, economic viability, and regulatory acceptance.