EP0484361A1 - Distributeur de substances semiochimiques agissant sur les insectes, methode de preparation de ces substances, et methode de lutte contre les insectes - Google Patents

Distributeur de substances semiochimiques agissant sur les insectes, methode de preparation de ces substances, et methode de lutte contre les insectes

Info

Publication number
EP0484361A1
EP0484361A1 EP90910730A EP90910730A EP0484361A1 EP 0484361 A1 EP0484361 A1 EP 0484361A1 EP 90910730 A EP90910730 A EP 90910730A EP 90910730 A EP90910730 A EP 90910730A EP 0484361 A1 EP0484361 A1 EP 0484361A1
Authority
EP
European Patent Office
Prior art keywords
composition
semiochemical
prepolymer
semiochemicals
pheromone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP90910730A
Other languages
German (de)
English (en)
Inventor
Petrus Sigbertus Marinus Derks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Publication of EP0484361A1 publication Critical patent/EP0484361A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/18—Vapour or smoke emitting compositions with delayed or sustained release

Definitions

  • Dispenser for insect semiochemicals for insect semiochemicals, method for the preparation thereof and method for the control of insects.
  • the invention relates to a composition for the controlled distribution of semiochemicals.
  • Semiochemicals as referred to in the present specification comprise semiochemicals as they occur in nature, synthetic analoga thereof and synthetic repellents and attractants etc.
  • Semiochemicals are substances which play a natural role in the chemical communication of plants and animals. They can be divided into allelochemicals and pheromones according to the interspecific (between individuals of different species) or intraspecific (between individuals within a species) effect. Semiochemicals can be used for the control of-undesired species, in particular when such substances can be prepared synthetically.
  • Semiochemicals for insects are particularly attractive agents for the control of insects, especially because of the high specificity, the small amounts required and the relative harmlessness for man and environment.
  • the use of these compounds as ** insect control agents can be based on their attractiveness, for example in the form of sex pheromones, for the insects, in very low concentrations in vapour form. When the insects have been concentrated in this way, they can be eliminated, for example by mechanical, chemical or biological means.
  • a semiochemical dispenser into which insects are lured on a small scale can also serve as an indicator of an imminent plague; in this way it can be determined when spraying with (conventional) insecticides must be carried out; by means of this targeted control, the consumption of insecticides can be reduced. Sex pheromones can also be used to disturb the communication between males and females and thus the reproduction of the insects.
  • European Patent Application 252,463 describes solid compositions wherein a non-cosmetic functional material such as a pheromone is entrapped in the lattice of a crosslinked, hydrophobic, comb-like polymer during in situ polymerization of monomers.
  • the monomers are essentially mixed mono- and di- functional monomers, preferably mono- and di-(meth)acrylates and are normally polymerized using peroxides.
  • the compositions are obtained as free flowing powders or beads only. This document does not describe a self dispensing composition for semiochemicals and furthermore it does not provide a solution for the problem of the sensitivity of many of the semiochemicals towards heat, light and radicals.
  • British Patent Application 2,141,932 describes a liquid or semi-liquid composition containing a pheromone or pheromone inhibitor and preferably a UV absorber, dissolved in a non-cross- linked polymer or copolymer matrix.
  • the pheromone is not present at the stage of polymerization but it is loaded into the matrix by dissolving the polymer and the pheromone in an organic solvent and subsequently evaporating the solvent.
  • These known compositions are only shown to distribute pheromones at an appreciable level for several days.
  • British Patent Application 2,113,170 discloses agricultural pesticides which are in the form of microcapsules with a pesticide contained therein, which capsules are obtained by dispersing the agent in water which also contains the constituents for a polycondensation reaction, and subsequently subjecting these constituents to a polycondensation reaction.
  • Pheromones are mentioned as possible pesticides. Disadvantages of these capsules are that they have only one specific form, that particular demands are made with regard to the solubility of the pesticide in water and that no solution is offered for the problem of the instability of semiochemicals.
  • EP-A-28l,9l8 discloses crop protection preparations in which a crop protection agent is impregnated in a crosslinked polystyrene or polydivinylbenzene.
  • Crop protection agents mentioned are, inter alia, pheromones.
  • the active substance is added only after the polymerization, as a result of which the control of the release and the stabilization of, for example, the pheromone leave something to be desired.
  • a means has now been found with which semiochemicals can be released into the environment over a long period and at an adjustable rate.
  • composition according to the invention is characterized in that the composition contains the semiochemical enclosed in a network of a crosslinked polymer and is substantially free of radical initiators.
  • the polymer network can be obtained by crosslinking a prepolymer which already contains the semiochemical and any auxiliaries required.
  • the dispenser for semiochemicals according to the invention has a number of advantages over the known means for the distribution of plague control and monitoring agents such as semiochemicals:
  • the rate of release of the semiochemical can be varied in a simple manner by modifying the network density, the type of prepolymer and the degree of loading; a further control of the rate of release is possible by adding a diffusion-retarding layer;
  • the semiochemical can be very uniformly distributed through the composition; - the shape of the dispenser is variable; the mixture can be brought into any shape before polymerization.
  • the applicability of the composition distributing the semiochemical is appreciably widened, while, as a result, the rate of release can also be further controlled; after all, the surface area/volume ratio can be varied as desired;
  • the stability of the semiochemicals can be increased in a simple manner in that all sorts of stabilizers, such as UV absorbers, antioxidants, colorants, pigments etc. , can be incorporated in the dispenser in a simple manner; - since the dispenser does not contain significant amounts of residues of initiators, such as photoinitiators and thermal initiators, the semiochemicals are not attacked by such initiators when the composition is exposed to light or heat, and thus their active life is lengthened.
  • stabilizers such as UV absorbers, antioxidants, colorants, pigments etc.
  • the polymer network in which the pheromone is enclosed is a crosslinked polymer.
  • the crosslinked polymer is preferably obtained by crosslinking a prepolymer.
  • the crosslinking can be physical, that is to say the prepolymer molecules are linked to one another by spatial interaction; preferably, however, the cross- linking is effected chemically, that is to say by forming bonds between groups of two prepolymer molecules in each case.
  • Suitable prepolymers are polyalkenes, polyethers, polyesters and like prepolymers having a relatively low degree of polymerization, to which the crosslinkable groups are bonded.
  • these crosslinkable groups are acrylate groups or methacrylate groups.
  • the most suitable type of curing is determined in the main by the nature, in particular the vulnerability, of the semiochemical which is present in the composition, and by the process costs for the curing.
  • the composition is cured by means of gamma irradiation or electron beam treatment. These methods do not require initiator substances, and therefore stabilizers, such as UV absorbers which would otherwise interfere with the crosslinking process, can already be present in a high concentration in the composition mixture before curing.
  • the composition preferably contains a stabilizer for the semiochemical, in particular a substance which absorbs UV radiation.
  • a stabilizer for the semiochemical in particular a substance which absorbs UV radiation.
  • the presence of a UV absorber is desirable in many cases since sunlight can cause a geometrical isomerization or other conversion of the active substance, which can lead to the semiochemical being inactivated or even having an opposite action.
  • Other auxiliaries such as antioxidants and/or pigments, can also be present.
  • the dispenser can have any desired shape. It can be in the form of small blocks which contain the desired amount of semiochemical, strips from which a piece containing a desired amount of active substance can simply be cut off, granules, coatings on a suitable support, and the like.
  • the dispenser can also be covered with a layer which has limited permeability for the semiochemical and thus retards the release as necessary.
  • the composition can contain the semiochemical in any desired concentration provided that there is still a polymer network. In general, the concentration will be between 1 and __>0% , depending on the shape of the dispenser, the desired rate of release and other factors.
  • All naturally occurring and synthetic semiochemicals can be used for distribution by means of the dispensers according to the invention.
  • analogous synthetic compounds having a comparable of enhanced effect can be used in the dispensing composition according to the invention.
  • the majority of pheromones are relatively simple organic compounds. Frequently they contain a carbon skeleton which is not branched or slightly branched or they have a terpene-like structure. Usually one or more double C-C bonds, and frequently also an oxygen-containing function such an alcohol, aldehyde, epoxide or ester, are present.
  • Examples are cis-7,8-epoxy-2- methyloctadecane, the sex pheromone of the gypsy moth, Lymantria dispar; cis-7-trans-ll-hexadecadienyl acetate, the sex pheromone of the cereal moth, Sitotroga cerealella; trans-8-trans-lO- dodecadienol, the sex pheromone of the codling moth, Laspeyresia pomonella; a mixture of cis-9- and cis-ll-tetradecenyl acetate, the sex pheromone of the summer fruit tortrix moth Adoxophyes orana; and cis-9-tricosene, the sex/aggregation pheromone of the domestic fly, usca domestica.
  • the invention also relates to a method for the preparation of a composition for the controlled distribution of semiochemicals.
  • the method is characterized in that a prepolymer is mixed with the semiochemical and, if required, with auxiliaries and stabilizers and the mixture is then crosslinked.
  • the crosslinking is either effected by means of gamma radiation or an electron beam, or by means of UV radiation or heat in the presence of a radical initiator, in which case the residues of the initiator are subsequently selectively removed by solvent extraction.
  • the prepolymer is preferably a prepolymer containing (meth)acrylate groups, as described above.
  • crosslinking the network is formed in which the active substance is enclosed.
  • Cross- linking using UV irradiation or heat has the advantage that these methods are relatively inexpensive because no expensive equipment is required.
  • a disadvantage of using UV or heat can be that some pheromones are sensitive to UV light or heat, either directly or via the initiator present. In the case of vulnerable pheromones, this can lead to the conversion of the active form to a less active or inactive form, which results in a reduction in the activity of the dispenser. In the case of other semiochemicals, some of which are also less vulnerable, the active form can be converted into a form which counteracts the active form, so that even with a low degree of conversion there is a greatly reduced action.
  • This problem can be avoided by carrying out the crosslinking using UV or heat in the presence of an initiator which is selectively extracted after polymerization.
  • the semiochemical is an apolar or weakly polar substance
  • a selective extraction can be achieved by using a polar initiator.
  • the residues, i.e. the conversion products and the unconverted starting material, of the initiator are removed from the crosslinked composition by extraction with the polar solvent.
  • polar solvents are dimethylformamide, dimethyl sulfoxide and the like, mixtures of these solvents with water, alcohol-water mixtures, and in particular water.
  • Water soluble UV initiators are, for example, aryl ketones substituted by ionic groups such as ammonium groups, or by non-ionic, polar groups such as hydroxy groups.
  • ionic groups such as ammonium groups
  • non-ionic, polar groups such as hydroxy groups.
  • a weakly polar or non-polar solvent can also be used for extraction if the semiochemical is sparingly soluble and the initiator is readily soluble therein.
  • UV irradiation or thermal energy for the crosslinking therefore depends in the main on the nature of the semiochemical.
  • crosslinking using electron beams, and especially gamma rays is preferred in the case of vulnerable semiochemicals, because this method of crosslinking on the one hand, inter alia because of the absence of initiators, causes little damage to the active substance and, on the other hand, UV absorbers and other stabilizers can be added thereto without objection and in virtually unlimited amounts.
  • the rate of release of the semiochemical from the composition according to the invention can be predetermined by adjusting one or more of various parameters, such as the network density, the type of prepolymer, the concentration of the semiochemical, the shape of the composition (surface area/ volume ratio) and the like, as is illustrated in more detail in the examples.
  • the rate of release is, of course, also dependent on the vapour pressure and the rate of migration of the semiochemical inside the polymer. If the semiochemical has a low vapour pressure, for example, the concentration in the dispenser will be made high, a flexible prepolymer and a relatively light crosslinking will be used and a high surface area/volume ratio will be set (films, coatings).
  • the semiochemical has a high vapour pressure
  • these parameters will be chosen to be precisely the opposite or, for example, a layer which has poor permeability for the semiochemical will be applied to the dispenser.
  • External factors which have an influence on the rate of release are the temperature and, to a very small extent, the wind speed.
  • a dispenser having the desired distribution characteristics can be obtained in all cases by an appropriate choice of parameters. These characteristics show a high degree of constancy over a prolonged period, which in every case is long enough to cover an entire season of, for example, four months.
  • the insect control can be based on disturbing the communication between female and male insects, as a result of which reproduction is impeded, or on the lure action, as a result of which the insects are lured into a trap in order to be eliminated or to be used as an indicator for spraying the crop with insecticides.
  • Example 1 Influence of the type of prepolymer on the release rate. Constituents: 90 w/w % prepolymer
  • Prepolymers 1, 3 and 4 are synthesized by CPM-TNO. They are Pluronics (Pluronic PE 6100, PE 10100 and PE 6400 respectively from BASF) methacrylated with the aid of isocyanate/ethyl methacrylate; for method see M.R. Thomas, Journal of Coatings Technology, 55 (703), PP- 998-1007 (1983). The others are commercial acrylates (UCB, SNPE, Diamond Shamrock).
  • the initial rate of release is measured as follows: air is passed at a specific rate and temperature over the pheromone dispenser, after which this stream of air is passed through a filter where the pheromone is captured (quantitatively) again (in the course of 2 hours) .
  • the amount of pheromone is determined by extraction of the filter followed by gas chromatographic measurement.
  • Network density polymers with a high network density (high func ⁇ tionality and/or low molecular weight of the pre- polymer; such as Nos. 10, 11, 12) have a low rate of release; flexibility of polymer chains
  • (flexible) aliphatic polymers have a higher rate of release than (rigid) aromatic polymers.
  • the pheromone preparations were subjected to an exposure in accordance with DIN 53,387- The exposure was carried out in a Xenotest 1200 U UV ageing apparatus under the following conditions: Apparatus : Xenotest 1200 U (Original
  • Light source 3 x 4500 W Xenon lamps UV filter system 2/3 "Drittelschalen UV-Spezialglas" Light intensity 90 + 5 W/m 2 Internal air temperature 30°C Black plate temperature 45 ⁇ 3°C Relative humidity 65 ⁇ 5% Irrigation : 3 min. per 20 min. , demineralized water
  • the "accelerated ageing/outdoor exposure” acceleration factor is determined by the nature and composition of the exposed material as well as by the exposure conditions. In principle, this factor therefore must be determined for each material.
  • PE-6100-IEM (see Example 1, test 1) with 10 w/w % E8.E10- dodecadienyl alcohol Method: mix constituents, with Irgacure 65I (UV initiator, product of Ciba-Geigy) or Gafsorb 2H4M (UV absorber, product of Gaf) if appropriate; cure (UV, gamma); 2 x 7 ⁇ 30 mm; - expose to accelerated ageing; determine residual amount of active substance in the preparation.
  • the codes used in Figure 1 are explained in Table B.
  • Example 3- Biological tests on the codling moth.
  • Constituents 88 w/w % PE-6100-IEM 10 w/w % Codlemone (see example 1) 1 w/w % Gafsorb 2H4M (Gaf) 1 w/w % Irganox 1010 (antioxidant from Ciba-Geigy) Method: mix constituents; pour into a glass mould which contains glass mats to reinforce the final dispenser (to be stapled on a stake) ; cure; 1 Mrad Gamma; pheromone dispensers from the field are analysed every week to determine the rate of release under standard conditions (temperature 15"C, wind speed 1.5 m/s) .
  • Results :
  • Rate of release and residual amount see Figures 2 and 3 (each point is an average of 4 measurements). Remarks:
  • Example 4 Biological tests on summer fruit tortrix moths (Adoxophyes orana) . Constituents:
  • Example ⁇ > Influence of the degree of crosslinking on the rate of release.
  • the prepolymer used is PE-6100 methacrylate.
  • This prepolymer is synthesized by CPM-TN0 by transesterification of ethyl methacrylate with Pluronic PE 6100 (BASF); see C.B. Rybny, CA. DeFazio, J.K. Shahidi, J.C. Trebellas, J.A. Vona, Journal of Paint Technology 46 (596), pp. 60-69 (1974).
  • the crosslinking agent used is trimethylolpropane triacrylate (TMPA; UCB) and tripropylene glycol diacrylate (TPGDA; UCB).
  • TMPA trimethylolpropane triacrylate
  • TPGDA tripropylene glycol diacrylate
  • Example 6 Influence of the degree of loading on the rate of release. Constituents: x w/w % E8,ElO-dodecadienyl alcohol 100-x w/w % PE-6100 methacrylate/TMPTA 1/1
  • Example 7 Composition cured with electron beam (EB) .
  • Initial release rate is 3 ⁇ g/cm 2 per hour.
  • Example 8 Selective extraction of photo-initiator from a UV cured composition. Constituents:

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Agronomy & Crop Science (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Catching Or Destruction (AREA)

Abstract

La présente invention décrit une composition pour la libération contrôlée de substances sémiochimiques, par exemple phéromones, où la substance est contenue dans un réseau de polymère réticulé dépourvu de résidus de molécule-mère radicale. On prépare cette composition en mélangeant un prépolymère aux substances sémiochimiques et aux additifs optionnels et en réticulant le mélange au moyen de rayonnements gamma ou d'un faisceau d'électrons, ou encore de rayonnements ultra-violets, ou de chaleur en présence d'une molécule-mère dont les résidus seront ensuite extraits. Le prépolymère sera de préférence un prépolymère à terminaison acrylate ou méthacrylate. La vitesse de libération de la substance sémiochimique peut être modifiée en changeant la densité du réseau, le type de prépolymères, le degré de chargement et la forme du distributeur. Les substances sémiochimiques instables peuvent être stabilisées par l'adjonction de stabilisateurs, par exemple absorbeurs d'ultra-violets et antioxydants. La vitesse de libération prédéterminée peut être maintenue pendant plusieurs mois. La composition peut être moulée ou appliquée sous forme de revêtement.
EP90910730A 1989-07-25 1990-07-20 Distributeur de substances semiochimiques agissant sur les insectes, methode de preparation de ces substances, et methode de lutte contre les insectes Pending EP0484361A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8901921A NL8901921A (nl) 1989-07-25 1989-07-25 Feromoonverdamper en werkwijze voor de bereiding daarvan.
NL8901921 1989-07-25

Publications (1)

Publication Number Publication Date
EP0484361A1 true EP0484361A1 (fr) 1992-05-13

Family

ID=19855101

Family Applications (2)

Application Number Title Priority Date Filing Date
EP90202002A Expired - Lifetime EP0410530B1 (fr) 1989-07-25 1990-07-20 Distributeur pour produits sémiochimiques d'insectes, son procédé de préparation et procédé de lutte contre les insectes
EP90910730A Pending EP0484361A1 (fr) 1989-07-25 1990-07-20 Distributeur de substances semiochimiques agissant sur les insectes, methode de preparation de ces substances, et methode de lutte contre les insectes

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP90202002A Expired - Lifetime EP0410530B1 (fr) 1989-07-25 1990-07-20 Distributeur pour produits sémiochimiques d'insectes, son procédé de préparation et procédé de lutte contre les insectes

Country Status (12)

Country Link
EP (2) EP0410530B1 (fr)
JP (1) JPH04506963A (fr)
AT (1) ATE121260T1 (fr)
AU (1) AU636903B2 (fr)
CA (1) CA2064103A1 (fr)
DE (1) DE69018724D1 (fr)
ES (1) ES2072374T3 (fr)
IN (1) IN171399B (fr)
MA (1) MA21912A1 (fr)
NL (1) NL8901921A (fr)
PT (1) PT94810A (fr)
WO (1) WO1991001085A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005132781A (ja) * 2003-10-31 2005-05-26 Sanyo Chem Ind Ltd 誘引剤
FR3109859B1 (fr) * 2020-05-07 2022-09-02 Melchior Material & Life Science France Utilisation de pheromones ultra pures pour la fabrication de dispositifs diffuseurs
WO2024081627A1 (fr) * 2022-10-10 2024-04-18 Provivi, Inc. Compositions et systèmes de phéromones stables au stockage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129302B (en) * 1982-08-21 1986-04-03 Chemical Discoveries Sa Ground treatment
IL69070A0 (en) * 1983-06-24 1983-10-31 Blank Izhak Pest control composition comprising a pheromone or pheromone inhibitor
US4855127A (en) * 1986-07-07 1989-08-08 Dow Corning Corporation Lattice-entrapped composition
DE3628091A1 (de) * 1986-08-19 1988-02-25 Basf Ag Mittel, insbesondere zur verbreitung von pheromonen
EP0617051A3 (fr) * 1987-08-24 1994-11-02 Allied Colloids Ltd Compositions polymériques.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9101085A1 *

Also Published As

Publication number Publication date
EP0410530A1 (fr) 1991-01-30
ES2072374T3 (es) 1995-07-16
CA2064103A1 (fr) 1991-01-26
MA21912A1 (fr) 1991-04-01
EP0410530B1 (fr) 1995-04-19
NL8901921A (nl) 1991-02-18
JPH04506963A (ja) 1992-12-03
PT94810A (pt) 1991-03-20
AU636903B2 (en) 1993-05-13
DE69018724D1 (de) 1995-05-24
WO1991001085A1 (fr) 1991-02-07
ATE121260T1 (de) 1995-05-15
IN171399B (fr) 1992-10-03
AU6076390A (en) 1991-02-22

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