I'm looking for current research on the use of plant essential oils as insecticides or pesticides. Particularly interested in plant oils that are effective against bacterial diseases in plants.
Such examples set.
Here the brightest.
Azadirachtin A (azad, neem, salannin) - a potent tetranortriterpenoid botanical insecticide derived from tree Neem active against a wide range of insect pests. It also has some fungicidal properties (http://sitem.herts.ac.uk/aeru/footprint/en/Reports/46.htm). It is highly effective insecticide against a bug (I personally took part in its tests).
Some natural extracts give rise to the whole new classes of pesticides, for example, fungicidу sorts strobilurin. The discovery of the strobilurin fungicides was inspired by a group of natural b-methoxyacrylates, the simplest of which are strobilurin A and oudemansin A (see article). Among other pesticides, which originate from natural fungicidal derivatives, the strobilurin class of compounds play an important role in an effective control of various types of plant pathogens (ascomycetes and basidiomycetes).
Senior staff scientist
Dynamic of pesticides Lab.\Institute of Plant Protection, BY
Certainly, I mean of extracts of plants in general. This wider concept, than plant essential oils, but basically there are no differences between the products.
Any case we deal with natural pesticides.
I agree with Xavier Ormancey, using of EO as pesticides could be expensive, from practical point of view. Moreover, many EO are very volatile, so the problem could exist also in handling and maintaining them on plant leaves or other parts (if you want to use them in form of spray). Extracts of the different plants which are used in EO production could be used as phytopharamceuticals, in more or less effective way. Many preparations, based on such substances were well known in organic agriculture.
It seems that Xavier is right. These oils are present in members of certain family like Lamiaceae. The percentage of the
oil obtained is also limited. Their antibacterial, antioxidant capacities are well established. Certain plants have insect repellent activities also. But still , using the oils for their insect repellent activities is an expensive business.
By the way, terpenoids are the oils.
Azadirachtin A - unique on the action mechanism insecticide: does incapacitated males colorado potato beetle.
It is a small confusion about the word 'essential oil' which is a mixture of mainly volatile mono and sesquiterpenoids and sometimes phenylpropanoids. Azadirachtin A and other related limonoids are non volatile triterpenoids which are not part of 'essential oils'. Otherwise your suggestion to see them as natural product is correct.
Thanks all. Mike the link in your first post is not working? Some of the research that I have read, EO extracts are found to contain certain compounds namely Thujone, Carvacrol p-cymene, Carvone, limonene, and cineole. Are these oils? If they are oils can they be obtained by water extract rather than steam distillation? Expensive for agriculture, yes I agree but could be a safe alternative for the home gardener, which is my area of interest. Water extract of mint appears to have some control over black spot (Xanthomonas campestris pv vesicatoria) on chilli plants, my own observation only.
Essential oil from Cinnamomum zeylanicum,
Cymbopogon citratus, Lavandula angustifolia syn.
L. officinalis, Tanacetum vulgare, Rabdosia melissoides,
Acorus calamus, Eugenia caryophyllata,
Ocimum spp., Gaultheria proacumbens, Cuminum
cymium, Bunium persicum, Trachyspermum ammi,
Foeniculum vulgare, Abelmoschus moschatus, Cedrus
spp. and Piper species are also known for their
pest control properties. EO are not for the pesticides and insecticides
For literature and querry, contact to central institue of medicinal and aeromatic plants (CIMAP, lucknow, uttar pradesh)
Pyrethoids extracted from chrysanthemums, these have low mamal toxicity and can control garden and house pests.
Ms. Susan Kirk
The attached reviews provide useful information on the subject of your query.
Best wishes.
Ms. Susan Kirk
Follow the thread for more papers
https://www.researchgate.net/post/iam_doing_my_research_on_effect_of_essential_oil_on_plant_pesti_need_suggestions
We can use neem oil for this purpose. It can be used as biopesticide.
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