The species of the genus Allium L., one of the largest genera of higher plants,occupying a significant place in the modern plant world, are of great interest bothfrom the theoretical and from the practical point of view. Plants of Allium spp.accumulate a large amount of carbohydrates, phenolic compounds (flavonoids andits glycosides, coumarins, anthocyanins, catechins), amino acids and organosulfurcompounds, such as allicin – a precursor for alkaloids and saponins formation.Secondary metabolites of Allium spp. have been successfully used during the pastfew decades in plants protection against pests and pathogens. We have earlierreported about high insecticidal and antifeedant properties of extracts from A.subhirsutum L., A. narcissiflorum Vill. and A. ramosum L. The highest insecticidalproperties against imago (20.0%) and larvae (60.0%) of Leptinotarsa decemlineata(Coleoptera: Chrysomelidaea) were demonstrated by extract from aerial part of A.subhirsutum. The purpose of this investigation was to determine the insecticidal,antifeedant and repellent properties of A. rotundum L. extracts against variousspecies of insects. As a result, it was found that the ethanolic extracts from theaerial part possessed the moderate level (40.0%) of insecticidal properties againstthe larvae of the L. decemlineata and low – against the imago (6.7-13.3%).Moreover, the extracts of A. rotundum showed moderate level of insecticidal,antifeedant and repellent activity against the larvae of lepidopterans (cottonbudworm Helicoverpa armigera and wax moths Galleria mellonella).
The purpose of our work was to study the effect of Slovak origin alginite on germination of tomato seeds, growth and development of plants, as well as to evaluate biological activity of alginite against to insect pests. Tomato seeds with low germination capacity were treated by immersion in alginite solutions of concentration 0.0001-0.1 %. Alginite solutions with concentrations of 0.1-5.0 % were used for testing against insects. The application of alginite solutions significantly increases the germination of tomato seeds in laboratory conditions by 9.2-13.0 %. There was a significant increase in the length of seedlings and roots by 1.87-2.98 cm and 3.54-4.51 cm. In a greenhouse presowing treatment of tomato seeds with 0.001 % alginite solution significantly increased germination in comparison with the control (by 33.2 %) and 0.01 and 0.1 % alginite solutions (by 22.2 and 25.0 %). Monitoring of plant height showed that a month after the first seedlings emergence the average plant height was significantly higher in the variant 0.001 % alginite solution and reached to 11.41 cm. The yield of fruits in the variants treated with alginite solutions significantly exceeded the control by 316.53-327.71 g per one tomato bush. It was found that alginite solutions at a concentration of 0.1-1.0 % had low ovicidal (2.73-13.19 %) and insecticidal (5.0-33.3 %) effects against insects belonging to different orders -Leptinotarsa decemlineata (Coleoptera), Galleria mellonella (Lepidoptera) and Halyomorpha halys (Hemiptera). Alginite solutions did not have contact insecticidal activity; the death of insects was caused mainly by the consumption of treated feed. At the same time, a high antifeedant effect was revealed from 45.0 to 85.0 % against adults and larvae of 2-3 instars of L. decemlineata and larvae of 2-3 instars of G. mellonella. To conclude, the application of alginite contributed to an increase in seed germination and plant productivity, and it did not reveal significant biological activity against insects.
The diversification of beech genotypes on the territory of the Republic of Moldova could be a so-lution to avoid the risks caused by climate change. The objective of this research was to determine the viability of beech seeds collected from four areas of the Ivano-Frankivsk region (Ukraine) and their modi-fication under the influence of various abiotic factors. The analyzed seeds possessed high viability (77.89 – 96.63%), which under the influence of supra optimal temperature +40°C decreased 1.3-1.4 times de-pending on the applied dose. Seeds exposed to heat treatment used reserve substances for radicle growth 1.4 – 1.6 times more than the control.
The antennae reaction of the males Heliothis armigera was estimated by means of the electroantenographic apparatus to the components obtained from the extract of the pheromone glands of the females. It was found that the main component (Z11-16Al) caused a well-pronounced reaction on the male antennae. It has been shown that the pheromone emitted by the females of the native population does not differ from the pheromone emitted by the females of the species Heliothis armigera, which lives in the geographical area of the Asian continent. The seasonal sexual cycle of the species Heliothis armigera was determined in the conditions of the natural habitat of the Republic of Moldova.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.