ABSTRACT Field experiments were conducted in 2022-2024 to compare the efficacy of selected commercial (SpinTor, NeemAzal, Spruzit, Rock Effect New = REN) and experimental plant-based preparations (Celastrus spp. extracts and fennel seed essential oil) against the larvae of the Colorado potato beetle ( Leptinotarsa decemlineata Say). In total seven treated variants plus an untreated control were established during the three years of experiments, while variants with the active ingredient Spinosad and extracts from Celastrus spp. (CA2301) were always included in the experiment, as they were profiled as the most effective. The main criterion for evaluating efficacy was defoliation, while larval mortality was monitored as well. In 2023, a yield estimate was made. The percentage of defoliation (± CI 95 ) in the control variant was 11.2 (7.2-17.5); 35.2 (29.0-42.8) and 17.6 (14.7-21.1) respectively. The lowest defoliation was always in the variants with spinosad and CA2301 for all three years. Specifically: 0.8 (0.3-2.3) for spintor+REN; 1.1 (0.5-2.4) and 0.2 (0.0-0.7) for spintor; 3.3 (1.8-6.2); 1.0 (0.4-2.4) and 1.4 (0.8-2.6) for CA2301. The worst-rated variants were with natural pyrethrins and REN. The defoliation was 10.2 (6.5-16.0) for spruzit in 2022; 49.5 (41.7-58.9) and 12.6 (10.3-15.6) for REN in 2023 and 2024. The highest yield was achieved with the SpinTor-treated variant (lmer; df = 7; P = 0.0005). The estimated yield per hectare would be 12.08 tons, while the control variant would yield 6.96 tons.
Kovaříková et al. (Mon,) studied this question.
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