1 The feeding preferences of Hylobius abietis (L.) were studied in a series of choice and no-choice trials for insecticide-treated food, time-to-death studies and arena trials. 2 Treatment of Scots Pine twigs with a pyrethroid insecticide, lambda-cyhalothrin, was compared with twigs treated with imidacloprid, a neonicotinoid. 3 Clear avoidance of insecticide-treated food sources, with strong evidence of selection for untreated food sources, was shown. 4 In addition, it took up to 3 weeks for H. abietis to die from insecticide poisoning when fed on treated food and, during this time, it was potentially capable of finding new untreated food sources.

The response of the large pine weevil (Hylobius abietis) to the pesticide lambda‐cyhalothrin, a pyrethroid, is investigated. Both behavioural (feeding preferences) and nutritional and physiological (lipid content) responses are recorded. Hylobius abietis shows both a significant avoidance of pesticide‐treated food sources and a decrease in lipid content after exposure, but a full recovery after feeding on untreated food. It is proposed that the mechanism for the pesticide avoidance and altered lipid levels is due to an anti‐feedant effect of the pesticide. Implications for pest management programmes are described.

Econometric study of British winter wheat trial plot data suggests lower economic loss than predicted from experiments. a r t i c l e i n f o a b s t r a c tNumerous experiments have demonstrated reductions in the yields of cereal crops due to tropospheric O 3 , with losses of up to 25%. However, the only British econometric study on O 3 impacts on winter wheat yields, found that a 10% increase in AOT40 would decrease yields by only 0.23%. An attempt is made here to reconcile these observations by developing AOT40 maps for Great Britain and matching levels with a large number of standardised trial plot wheat yields from many sites over a 13-year period. Panel estimates (repeated measures on the same plots with time) show a 0.54% decrease in yields and it is hypothesised that plant breeders may have inadvertently selected for O 3 tolerance in wheat. Some support for this is provided by fumigations of cultivars of differing introduction dates. A case is made for the use of econometric as well as experimental studies in prediction of air pollution induced crop loss.

ObjectiveTo explore the impact of the measures taken to combat COVID-19 on the patterns of acute illness in children presenting to primary and secondary care for North West London.Design/setting/participantsRetrospective analysis of 8 309 358 primary and secondary healthcare episodes of children <16 years registered with a North West London primary care practice between 2015 and 2021.Main outcome measuresNumbers of primary care consultations, emergency department (ED) attendances and emergency admissions during the pandemic were compared with those in the preceding 5 years. Trends were examined by age and for International Statistical Classification of Diseases and Related Health Problems 10th Revision-coded diagnoses of: infectious diseases, and injuries and poisonings for admitted children.ResultsComparing 2020 to the 2015–2019 mean, primary care consultations were 22% lower, ED attendances were 38% lower and admissions 35% lower. Following the first national lockdown in April 2020, primary care consultations were 39% lower compared with the April 2015–2019 mean, ED attendances were 72% lower and unscheduled hospital admissions were 63% lower. Admissions >48 hours were on average 13% lower overall during 2020, and 36% lower during April 2020. The reduction in admissions for infections (61% lower than 2015–2019 mean) between April and August 2020 was greater than for injuries (31% lower).ConclusionThe COVID-19 pandemic was associated with an overall reduction in childhood illness presentations to health services in North West London, most prominent during periods of national lockdown, and with a greater impact on infections than injuries. These reductions demonstrate the impact on children of measures taken to combat COVID-19 across the health system.

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