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  • Survival Analysis of the Gr...
    Ma; Duarte, Marciel Lelis; Venzon, Madelaine

    Agriculture (Basel), 01/2023, Volume: 13, Issue: 2
    Journal Article

    Brazil is the country which has produced the most coffee for over 150 years, and to achieve high productivity, pesticides are the most common control measure for pests. Due to the need to adopt less impactful control practices, natural enemies or insecticides of botanical origin have been studied as alternatives to synthetic insecticides. However, botanical pesticides can negatively affect some natural enemies, and the effect depends on the formulation and concentration. The objective of this study was to estimate the survival of green lacewing larvae, Chrysoperla externa (Hagen), exposed to different doses of neem-based products, whose active ingredient is azadirachtin (Azamaxsup.®: 0 (control treatment with distilled water), 12, 24, 36, 48, 60, 72, 84, 96, and 108 mg a.i. Lsup.−1; Organic neemsup.®: 0, 3.3, 6.6, 9.9, 13.2, 16.5, 19.8, 23.1, and 26.4 mg a.i. Lsup.−1; Natuneemsup.®: 0, 3.8, 7.5, 10.5, 15.0, 18.8, 22.5, 26.3, 30.0, and 33.8 mg a.i. Lsup.−1), using a parametric approach. Predator larvae were exposed to neem-based insecticides and evaluated for 20 days. Survival curves estimated by the models-Log-logistic for Azamaxsup.®, Weibull for Organic neemsup.®, and Log-normal for Natuneemsup.®-demonstrated an inverse relationship between increasing doses and survival time. These concluded that the application dose should be less than 84 mg a.i. Lsup.−1 for Azamaxsup.®, 19.8 mg a.i. Lsup.−1 for Organic neemsup.®, and 26.3 mg a.i. Lsup.−1 for Natuneemsup.® to keep 50% of the green lacewings alive for 13 days, which is the average time for the larval cycle of C. externa.