Thumbnail Image

Insecticidal activity of Thuja occidentalis essential oil and monoterpenoids with surfactants against the Myzus persicae

XV World Forestry Congress, 2-6 May 2022










Also available in:
No results found.

Related items

Showing items related by metadata.

  • Thumbnail Image
    Document
    The effect of modification of hydroxy group of alkanol and benzyl alcohol to hydroxyalkyloxy group on nematicidal activity against pine wood nematode
    XV World Forestry Congress, 2-6 May 2022
    2022
    Also available in:
    No results found.

    Pine wood nematode (PWN), Bursaphelenchus xylophilus causes devastating damage to pines worldwide. Control and prevention of pine wood disease (PWD) in Korea is primarily trunk injection of abamectin and emamectin benzoate. Previously we found the nematicidal activity of 2-(1-undecyloxy)-1-ethanol (monochamol), which is reported to be aggregation pheromone of its vectors, Monochamus species, was as same to that of abamectin. Since then, we tried to develop new agent for controlling and preventing PWD using alkyloxyalkanols (ROR’OH) and benzyloxyalkanols (BzOROH). We synthesized ROR’OH and BzOROH by substituting hydroxy group (–OH) to hydroxyalkyloxy group (–OROH) and tested their nematicidal activity against PWN. As controls, monochamol and abamectin were also tested. The substitution –OH group to –OROH affected the nematicidal activity increasingly. The nematicidal activity was different according to total carbon chain length in compounds, although the compounds have same molecular formula. It may be due to the different position of oxy group in the compound of alkyloxyalkanol LC50 values of C10OC4OH, C6OC8OH, C10OC2OH and C12OC2OH were as same as that of monochamol. Substitution of hydroxy group of benzyl alcohol enhanced the nematicidal activity of new compound. Here, we will report the nematicidal activity changes by substitution –OH of alkanol and benzyl alcohol to –OROH. Keywords: Agriculture, Research ID: 3619465
  • Thumbnail Image
    Document
    A cluster analysis of variables essential for climate change adaptation of smallholder dairy farmers of Nandi County, Kenya
    XV World Forestry Congress, 2-6 May 2022
    2022
    Also available in:
    No results found.

    Smallholder dairy farmers occupy high potential areas of Kenya and are a source of manure, crops and milk. There is need to use other means of characterising smallholder dairy farmers as they mostly practice mixed farming. The objective of this paper is to use cluster analysis method to characterize the smallholder dairy farmers with added farmer and activity data variables. Clusters of 336 farmers in this study were derived using 28 key variables. This paper demonstrates how to conduct farmer assessments for climate change adaptation activities, climate smart technologies implementation using knowledge of key farmer variables and their distribution in the smallholder dairy farmers of Nandi County, Kenya. This paper demonstrates the importance of integrating agricultural information for smallholder dairy farmers to machine models to characterize the groups and observe the natural groupings. This allows for policy managers to know the key characteristics and how to use them in policy implementation especially in designing climate change adaptation programs factoring education and training of farmers as demonstrated in this paper that they are practicing many activities on their farms. Keywords: Climate change, Agriculture, Education, Adaptive and integrated management, Monitoring and data collection ID: 3469789
  • Thumbnail Image
    Document
    A preliminary study on ecological features of two natural enemies against two vectors of pine wilt disease for mass rearing in Korea
    XV World Forestry Congress, 2-6 May 2022
    2022
    Also available in:
    No results found.

    Two species of the genus Monochamus (Coleoptera: Cerambycidae), M. alternatus and M. saltuarius are well-known as vectors of the pine wilt disease and they causes economically damages in South Korea. Among various control methods to reduce the density of vectors, a method by biological control agents (natural enemies) is eco-friendly indispensable. Since 2017, we have carried out the studies on the parasitic natural enemies againt for the vector species and found two parasitoids, Spathius verustus Chao, 1977 (Braconidae) and Cyanopterus flavator (Fabricius, 1793) (Bracondiae), would be a useful agents for biological controls. For accumulation of biological data, we conducted a preliminary study on life span and parasitic rate of two parasitic wasps against for two vector species. As results, we found that S. verustus has the longest adult life span of 33.4±19.2 days (avg.) in M. alternatus (T=30°C, H=60%) and C. flavator has the longest adult life span of 25.1±10.6 days (avg.) in M. alternatus (T=25°C, H=60%). The average parasitic rate (62.5%) of S. verustus was highest in M. alternatus (T=30°C, H=60%). In addition, it is confirmed that the offsprings of S. verustus can be made by parthenogenetic reproducton. Keywords: Research ID: 3622037

Users also downloaded

Showing related downloaded files

No results found.