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In the study carried out to determine whether peppermint essential oils have lethal effects on Leptinotarsa decemlineata (Coleoptera: Chrysomelidae), 5 different peppermint oils obtained by distillation method were applied to fourth instar larvae at doses of 0.01, 0.1 and 0.2 µl/ml, and the numbers of live and dead individuals were checked and recorded at 24-hour intervals. Because of the experiment, the highest mortality rate in Mentha arvensis essential oil-treated individuals was determined as 30.56% on day 9 in 0.10 µl/ml dose-treated individuals. In M. dumetorum essential oil-treated individuals, the highest mortality rate was 23.33% on day 3 in 0.01 µl/ml dose-treated individuals. As for in M. pulegium essential oil-treated individuals, this rate was 25.93%. The highest effect of M. spicata essential oil was observed on day 7 with a rate of 32.31% in 0.10 µl/ml dose-treated individuals. In M. suaveolens essential oil-treated individuals, the highest mortality rate was 18.7% in 0.01 µl/ml dose-treated individuals on day 7. According to the data obtained in the study, it was understood that the effect of essential oils was higher than the control, but there were no statistically significant differences between each other. The study obtained data that could form ideas for future studies. Considering that, the adverse effects of herbal extracts on the environment and human health are either none or extremely low, it was thought that the potential of using mint extracts against L. decemlineata as an alternative to chemical pesticides could be increased with detailed studies. [ABSTRACT FROM AUTHOR]

In this study, some biological characteristics of the Mint aphid, Eucarazzia elegans (Ferrari) (Hemiptera: Aphididae) were determined on Mentha arvensis, M. dumetorum, M. pulegium, M. spicata and M. suaveolens mint varieties. The nymphs obtained from E. elegans individuals raised for this purpose were used in the experiment and the experiments were continued until all individuals died. The data obtained from the experiment were analyzed according to the theory of the two-sex life table. The longest pre-adult development time was 7.533 days in individuals reared on M. suaveolens and the shortest was 5.900 days in individuals reared on M. pulegium. The net reproductive rate (R0) of the mint aphid was highest in individuals reared on M. arvensis variety with 63.102 females/female. The intrinsic rate of increase (r) value was highest in individuals reared on M. pulegium cultivar, 0.371 females/female/day, and lowest in individuals reared on M. dumetorum variety, 0.252 females/female/day. The finite rate of increase (λ) was 1.450 day-1 in individuals reared on M. pulegium. The longest population doubling time (DT) value was calculated as 2.516 days in individuals reared on M. dumetorum variety. In this study, the mint variety M. pulegium was found to be more susceptible to E. elegans than other varieties. Mentha dumetorum variety is thought to be more resistant to E. elegans than other varieties. It is thought that it would be more appropriate to cultivate M. dumetorum mint variety, which is determined to be resistant in areas heavily contaminated with E. elegans. [ABSTRACT FROM AUTHOR]

Mint is a common name given to the Genus Mentha species, belonging Lamiaceae family, cultivated for their essential oil and spice using. Yield characteristics of total five spearmint varieties, which four of them are commercial foreign cultivar another one is selected clones from Turkish landraces for cultivar, were studied in Isparta ecological conditions during 2016 and 2017 years with three replication of randomized block design. Total yields (fresh and dried herb, dried leaves and essential oil) of the varieties were determined in vegetation periods of each year. According to twoyear studies, mean data of fresh herb, dried herb, and dried leaves were 18.2-21.5 t/ha, 5.1-6.2t/h and 2.9-3.9 t/ha, respectively. The yields of essential oil were between 54.0 and 84.8 L/ha. As a result of the study, although the differences in dry leaf yields of clones and varieties were insignificant, statistically, the highest leaf yield was obtained from Crispa cultivar. But Applemint, Maracco varieties gave higher oil yields than other varieties. Therefore, it has been determined that Applemint, Maracco varieties can be recommended for essential oil production in the region. [ABSTRACT FROM AUTHOR]