FR2816475A1 - Guard for protecting fruit trees against climbing parasitic insects and larvae comprises barrier ring with smooth surface and trough for fluid - Google Patents

Abstract

The guard consists of a ring (1) fitted round the trunk (9) of a tree at ground level (10), with barriers (4, 8) specific to the parasites being combatted. One barrier is a near-vertical smooth wall (4), and the other is a trough (8) that can be filled with a substance (11) whose composition or consistency creates an insurmountable obstacle to the creatures. The guard can have a slit in one side to open it, or be made in two assembled sections.

Description

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The invention relates to a method for protecting plantations against crawling insects and larvae.

The trees are frequently attacked by larvae of insects which lodge in the fruit or under the bark; in a number of cases the insects lay eggs in the soil surrounding the base of the tree; the larvae from the eggs move straight towards the base of the tree to climb there, along the trunk, and settle there. There are also ants that establish colonies of aphids in the trees and then come to extract the liquid produced.

Gardening guides recommend combating these pests by spraying the soil or the tree in certain seasons with chemicals that are expensive and generally polluting; gardeners prefer to coat the trunk of the tree with lime milk, which does not seem to be of any foolproof efficiency; others coat the trunk in an annular zone a few centimeters high with a sticky substance that the larvae and insects, which climb along the trunk while moving towards the leaves or fruits, cannot cross; this last way of proceeding is not very aesthetic because the sticky material is there permanently, and does not guarantee the protection of the trunk of the tree against parasites which are likely to pass under the bark. It is interesting to be able to protect certain plants from attack by crawling insects; some young tree plantations are protected by an annular net or plastic tubes from attacks by herbivorous mammals, but are not protected from attacks by insects and larvae

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rampants.

crawling.

The object of the invention is to propose a method of protection, consisting of at least one device for implementing, against planting. creeping insects and larvae which can either be used at certain times and removed at other times, or put in place when the plantation is created and remain there until the end of the vegetative cycle or until the natural destruction of the device or devices for implementing the process by the atmospheric environment.

The figure. 1 shows an exploded perspective view of an annular barrier device according to the method.

The figure. 2 shows a section in partial elevation of the annular barrier device of the figure. 1 in operational position.

The figure. 3 shows an annular barrier device according to a variant and an improvement of the method.

The figure. 4 shows an open annular barrier device according to an improvement of the method.

The figure. 5A and the figure. 58 show a front elevation view and a side elevation view of a device for connecting the ends of an open annular barrier device.

The figure. 6 shows a perspective view of an annular dam according to a preferred version of the invention.

The method consists in placing on the ground, around the plantation to be protected, at least one annular barrier device whose profile of the section is shaped to be able to constitute or support at least one impassable obstacle specifically for insects and / or larvae.

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rampants dont on veut protéger la plantation ; il peut présenter par exemple une paroi annulaire quasi-verticale et lisse sur laquelle les insectes ne peuvent pas s'accrocher ** pour l'escalader, et ou une gouttière annulaire remplie d'un produit dont la composition et ou la consistance est susceptible de constituer un obstacle infranchissable aux larves ou insectes rampants dont on veut protéger la plantation.

creepers whose plantation you want to protect it may for example have an almost vertical and smooth annular wall on which the insects cannot hang ** to climb it, and or an annular gutter filled with a product whose composition and or consistency is likely to constitute an insuperable obstacle to the larvae or crawling insects whose planting is to be protected.

In one version of the invention, the annular barrier device 1 (FIG. 1) is made, for example, from a thin plate of thermo-plastic material which is thermoformed or from thermo-plastic material which is injected into a mold; all thermo-plastic materials likely to be thermoformed and or injected can be considered; the thermo-plastic material used being chosen as a function of specifications relating to the conditions of use of the annular barrier device 1. The most commonly considered thermo-plastic materials are, for example, PVC, polypropylene, polyethylene, polystyrene, ABS or PET and their variants making it possible to increase a certain number of performances such as, for example, resistance to ultraviolet radiation or on the contrary the controlled biodegradability to disappear naturally after a certain time. The annular barrier device 1 (FIG. 1 and FIG. 2) is, for example, a surface of revolution having a profile 23 which we will describe below; this annular barrier device is, for example, composed of an annular flat base 2 with a width of the order of a centimeter; the inner border of

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la base plane annulaire 2 sert de grande base 3 à une surface troncônique de révolution 4, autour d'un axe de symétrie de révolution 5, et dont les génératrices font un angle de l'ordre de dix à vingt degrés avec l'axe de symétrie de révolution 5 ; la petite base 6 de la surface troncônique de révolution 4 est dans un plan situé environ à une dizaine de centimètres du plan de la base plane annulaire 2 et se prolonge en se raccordant tangentiellement suivant un bord circulaire extérieur d'une première surface semi-torique 7, de section semi-circulaire d'environ quinze à vingt millimètres de diamètre, venant se placer à l'intérieur de la petite base 6 avec l'intérieur du tore tourné vers la grande base 3 de la surface troncônique de révolution 4 ; la bordure intérieure de la première surface semi-torique 7 se prolonge en se raccordant tangentiellement à son tour sur la bordure extérieure d'une deuxième surface semi-torique 8 de section semi-circulaire, d'une dizaine de millimètres de diamètre, avec l'intérieur du tore tourné du côté opposé à la grande base 3 de la surface troncônique de révolution 4 ; la deuxième surface semi-torique 8 constitue une sorte de gouttière qui peut contenir un liquide lorsque la base plane annulaire 2 est posée sur un sol horizontal.

the annular flat base 2 serves as a large base 3 to a frustoconical surface of revolution 4, around an axis of symmetry of revolution 5, and whose generatrices make an angle of the order of ten to twenty degrees with the axis of symmetry of revolution 5; the small base 6 of the frusto-conical surface of revolution 4 is in a plane located approximately ten centimeters from the plane of the annular plane base 2 and is extended by tangentially joining along an outer circular edge of a first semi-toric surface 7, of semi-circular section of about fifteen to twenty millimeters in diameter, coming to be placed inside the small base 6 with the inside of the torus facing the large base 3 of the frustoconical surface of revolution 4; the inner edge of the first semi-toric surface 7 is extended by being tangentially connected in turn to the outer edge of a second semi-toric surface 8 of semi-circular section, of about ten millimeters in diameter, with l 'interior of the torus turned on the side opposite to the large base 3 of the frustoconical surface of revolution 4; the second semi-toric surface 8 constitutes a sort of gutter which can contain a liquid when the annular flat base 2 is placed on a horizontal floor.

In a preferred version of the invention, the annular barrier device 1 is shown. 2 is positioned on the ground 10 so as to surround the plantation 9 to be protected; preferably, the annular flat base 2 is slightly buried in the ground 10 so that the creeping insects and larvae cannot pass under the annular barrier device 1 when the soil 10 is uneven; the

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deuxième surface semi-torique 8 en forme de gouttière est remplie, par exemple, de glu 11. Ainsi le dispositif de barrage annulaire 1 comporte une premier obstacle pour les zu insectes et les larves qui ne peuvent gravir la surface troncônique de révolution 4 et un deuxième obstacle, pour ceux qui ont réussi à passer le premier obstacle, constitué par la glu 11 dans laquelle ils vont s'engluer. il a été décrit, pour expliquer la conception du piège, un dispositif de barrage annulaire 1 de forme générale circulaire ; mais il peut bien évidemment être de forme différente telle que, par exemple, qu'un dispositif de barrage annulaire 12 (figure. 3) de forme polygonale régulière ou non.

second semi-toric surface 8 in the form of a gutter is filled, for example, with glue 11. Thus the annular barrier device 1 comprises a first obstacle for the zu insects and the larvae which cannot climb the frustoconical surface of revolution 4 and a second obstacle, for those who have managed to pass the first obstacle, constituted by the glue 11 in which they will stick. to explain the design of the trap, an annular barrier device 1 of generally circular shape has been described; but it can obviously be of different shape such as, for example, that an annular barrier device 12 (FIG. 3) of regular polygonal shape or not.

If it is a question of protecting the foot of a tree, it is generally impossible to thread the annular barrier device 1 (FIG. 1), around the trunk of the tree, if it is in one piece; it is possible, for example, to produce an open annular barrier device 13 (FIG. 4), made of a thermoplastic material having a certain flexibility, and which is open, for example, by sawing carried out in a plane, according to a generator of the frustoconical surface 14 by simultaneously cutting the annular flat base 15 and the semi-toric surfaces 16 and 17 along a plane passing through the axis of symmetry of revolution 18, to obtain two ends 19 and 20 placed facing face having the shape of the profile of the open annular barrier device 13; then it is enough to separate these ends 19 and 20 either by keeping them one opposite the other or by shifting them one relative to the other to be able to pass them on either side of the trunk of

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l'arbre à protéger ; lorsque le dispositif de barrage annulaire 13 ouvert est passé autour du tronc il est possible de fixer entre elles les extrémités 19 et 20 par zu exemple en utilisant un dispositif de raccordement 21 (figure. 5A et figure. 5B) réalisé en matière thermo-plastique injectée ayant une forme cylindrique 26 dont la section 22 circonscrit le profil 23 (figure. 2) des extrémités 19 et 20 (figure. 4) du dispositif de barrage annulaire et limitée par deux plans latéraux parallèles constituant les faces 24 et 25 (figure. 5A), perpendiculaires aux génératrices de la forme cylindrique 26, distantes entre-elles d'une dizaine de millimètres et présentant respectivement une gorge 27 et 28 (figure. 5B) ayant le profil respectivement des extrémités 19 et 20 du dispositif de barrage annulaire 13 ; les deux gorges 27 et 28 sont symétriques entre elles par rapport au plan de symétrie des deux faces 24 et 25 ; les extrémités 19 et 20 (figure. 4) du dispositif de barrage annulaire 13 ouvert sont respectivement encastrées dans les gorges 27 et 28 ce qui permet de fermer le dispositif de barrage annulaire 13.

the tree to be protected; when the open annular barrier device 13 is passed around the trunk, it is possible to fix the ends 19 and 20 between them by example by using a connection device 21 (FIG. 5A and FIG. 5B) made of thermoplastic material injected having a cylindrical shape 26 whose section 22 circumscribes the profile 23 (figure. 2) of the ends 19 and 20 (figure. 4) of the annular barrier device and limited by two parallel lateral planes constituting the faces 24 and 25 (figure. 5A), perpendicular to the generatrices of the cylindrical shape 26, spaced apart from each other by about ten millimeters and having respectively a groove 27 and 28 (FIG. 5B) having the profile respectively of the ends 19 and 20 of the annular barrier device 13 ; the two grooves 27 and 28 are symmetrical with respect to the plane of symmetry of the two faces 24 and 25; the ends 19 and 20 (FIG. 4) of the open annular barrier device 13 are respectively embedded in the grooves 27 and 28 which makes it possible to close the annular barrier device 13.

If the tree to be protected is too large compared to the dimensions of the open annular barrier device 13, to pass it around the tree by deformation, or if the material used to manufacture it is too rigid, it is possible to separate a annular barrier device 12 (FIG. 3) in at least two independent parts 30 and 31, for example by sawing as previously described, and to assemble the independent parts 30 and 31, around the tree trunk, without having them beforehand deformed by connection devices 32 and 33 of the type of those previously described.

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In a preferred version of the invention, the annular barrier 34 (FIG. 6) is composed of an assembly of two types of parts whose current profile is substantially the same as the profile 23 (FIG. 2); the first type piece is a corner piece 35 at first and second ends 37 and 36 from which are fixed two linear pieces 38 and 39 which are then perpendicular to one another; the free end 40 and 41 of each linear piece 38 and 39 can be fixed either to a corner piece 42 and 43 or to a linear piece depending on the size of the ring that one wants to make; the annular dams 34 thus produced comprise four corner pieces 35 42 43 44 and a variable number of linear pieces 38, 39, 45, 46, making it possible to obtain substantially truncated trapezoidal shapes whose base is square or rectangular. The assembly can be carried out as described above, but in a preferred version, a first end 37 or 40 of each corner piece 35 or linear 38 has a recess 47 or 48 relative to the current profile, of a value of l order of the thickness of the walls of the corner pieces 35 and linear 38, over a length of the order of one to two centimeters and a second end 36 and 49 located in the extension of the current profile of the piece of angle 35 or linear 38; the first ends 37 48 are always placed on the same side of the corner pieces 35 38 or linear when they are observed, for example, on the external side of the annular barrier 34, so that each first end 37 40 comes to cover a second end 49.50 which are then fixed together, for example, by gluing or by screwing.

Claims (10)

 Claims 1-Method for protecting plantations against insects and creeping larvae, consisting in surrounding them with at least one annular barrier device (1) (12) (13) disposed on the ground (10), the profile of which the section is shaped to be able to constitute or support at least one insurmountable obstacle (4) (11) specifically for insects and or crawling larvae whose plantation is to be protected (9). 2-A method according to claim 1, characterized in that an impassable obstacle (4) (14) consists of an almost vertical and smooth annular wall. 3-A method according to claim 1, characterized in that an impassable obstacle consists of an annular gutter (8) (17) which is filled with a product (11) whose composition and or consistency is capable of constitute an insuperable obstacle to larvae or crawling insects. 4-barrier device, in carrying out the method according to claims 1 to 3, characterized in that it consists of an annular barrier device (1) (13) formed of a surface of revolution composed of a base annular plane (2) (15) whose inner edge serves as a large base (3) for a frustoconical surface of revolution (4) (14), around an axis of symmetry of revolution (5) (18), and of which the generatrices make an angle of the order of ten to twenty degrees with the axis of symmetry of revolution (5) (18), the small base (6) of the frusto-conical surface of revolution (4) extending by joining tangentially along an outer circular edge of a first semi-toric surface (7) (16), with the inside of the torus facing <Desc / Clms Page number 9>  the large base (3), the inner edge of the first semi-toric surface (7) (16) extending by joining tangentially in turn on the outer edge of a second semi-toric surface (8) (17) of semicircular section, with the inside of the torus turned on the side opposite to the large base (3), the intersection between a plane of symmetry passing through the axis (5) and the annular barrier device constituting a profile ( 23). 5-A method according to claims 1 to 3, characterized in that the annular barrier device (1) (13) is positioned on the ground (10), so as to surround the plantation (9) to be protected, the plane base annular (2) (15) being slightly buried in the ground (10) the second semi-toric surface (8) (17) being filled with glue (11). 6-barrier device according to claim 4, characterized in that the annular barrier device (13) is open along a generatrix of a frustoconical surface (14) to obtain two ends (19) and (20) placed facing face, having the shape of the profile (23) of the annular barrier device (13), which it suffices to separate in order to be able to pass them on either side of the trunk of the tree to be protected and then to fix them between them using a connecting device (21) (32) (33) having a cylindrical shape (26) limited two faces (24) and (25) having a groove (27) and (28) in which come fit the ends (19) and (20) respectively. 7-barrier device according to claim 6, characterized in that an annular barrier device (12), (34) is composed of at least two independent parts (30), (31), (35), ( 42), (43), (44), (38), (39), (45), (46), <Desc / Clms Page number 10>  which are assembled by connection devices (32), (33), (47) (48). 8-barrier device according to claim 7, characterized in that an annular barrier device (12) is composed of two identical parts (30) and (31) which are assembled by connection devices (32) and ( 33). 9-barrier device according to claim 7, characterized in that an annular barrier device (34) is composed of the assembly of four angular parts (35) (42) (43) (44) with linear parts (38) (39) (45) (46) in variable number making it possible to obtain an annular barrier (34) with a square or rectangular base. 10-barrier device according to any one of claims 4 and 6 to 9 to 9, characterized in that the annular barrier devices (1) (12) (13) (34) are made from thin plates of thermo-plastic material which is thermoformed or from thermo-plastic material which is injected into a mold, the thermo-plastic material used being based on PVC or polypropylene or polyethylene or polystyrene or ABS or PET or of one of their variants.