FR2824564A1 - New microcrystalline wax composition for grafting vine plants suppresses the 'stress' phenomenon which affects the plants - Google Patents

Abstract

Microcrystalline wax composition comprising: (i) a mixture of saturated branched and/or cyclic hydrocarbons (94-96 wt.%); (ii) aluminum or other light metal lamellar particle paste dispersed in a paraffin support (4-6 wt.%); and optionally (iii) a neutral additive for use a dispersing and homogenizing agent (0.4-0.6 wt.%), is new.

Description

39 in a therapeutic composition.

  New composition of microcrystalline waxes and its use for

grafting of vine plants.

  The present invention relates to a new composition of microcrystalline waxes. The invention also relates to the use of this wax

  s in the grafting process of vine plants.

  It has already been proposed in the art to use waxes

  microcrystallines for grafting vine plants.

  The grafting is performed on a table, which allows a high yield to be obtained, and the process used is generally the following: 10 (1) The graft is introduced into the rootstock and is then immersed in a microcrystalline grafting wax , intended to stimulate callogenesis and rhizogenesis and to compensate for the biochemical deficiency of callus

  by establishing better vascularity.

  An anticryptogamic fungicide present in the wax improves the rooting and recovery rate of the grafted cuttings. The improved sanitary state of the grafted plant thus protected enables it to resist Botrytis Cinerea, a fungus responsible for gray rot or "canvas", which develops in particular during the stay of grafted cuttings in a warm room, before their placement in . popmlere. A microcrystalline wax which can be used in this phase is. through

  example, the wax marketed under the name ACTYGREF.

  (2) The grafted plants are then installed in tubs, in batches of around 2000 for example, in a hot room at around 30 C, 2s until the foliage appears, which generally takes place between 12 and

  days (so-called stratification phase).

  (3) The plants are then soaked in a so-called reparaffining wax with high melting point (76-80 C), intended to provide effective protection against climatic and mechanical attack. Indeed, the young callus, very sensitive, must be protected against the actions

  mechanical and against injuries.

  The wax used for this purpose must have good plasticity and good impermeability, not soften at the amblage temperature and

do not flake.

  3s (4) The plants thus treated are then planted in a nursery.

  (5) With a view to storing the grafted plants in a cold room or sending them to the end user, the roots are pruned and a new reparaffinisation or dressing. The present invention aims to provide a composition of microcrystalline waxes which can be used as reparaffining wax in the stages

  (3) and (5) of the grafting process defined above.

  The invention also aims to provide such a wax composition in which the microcrystalline cTres used are bio-degradable. o Finally, the invention aims to propose such a composition of waxes, which, on the plants leaving the stratification phase, is capable of protecting the

  cal of ultraviolet and infrared radiation.

  To this end, the invention has for its object and a composition of microcrystalline waxes, characterized in that it comprises in combination: s from 94 to 96% by weight of a mixture of saturated hydrocartures with branched chains and / or d 'saturated hydrocarbons with cyclized chains; - from 4 to 6% by weight of a paste of lamellar particles of aluminum or of another metal accommodating dispersed in a paraffin support; - optionally from 0.4 to 0.6% by weight of a neutral additive, serving

  dispersing and homogenizing agent.

  The saturated branched chain hydrocarbons of the mixture of hydro carbides may represent between 40 and 50% by weight thereof. The hydrocarbons will respond in particular to the formula: CH3 (CH2) n CH3- CH - (CH2) n'-CH -CH3 (CH2) n "CH3 3s on, n 'and n", are whole numbers, identical or different, of

preferably at least equal to 1.

  The saturated hydrocarbons with a cyclized chain of the mixture of hydrocarbons can represent between 10 and 30% by weight of this mixture. They can be represented by the following formulas:

CH2 CH2

/ / \

CH2 CH2 or CH CH-tCH2) n-CH

1 1 1 1

CH2 CH2 CH2 CH2

0 \ / \ /

CH2 CH2

  where n represents an integer at least equal to 1.

  The aluminTum paste or other light metal used may comprise about 4 to 6% by weight of aluminum. Appropriate aluminum pastes are commercially available, where they are used in particular for the pigmentation of plastics, for the production of metallic printing inks or paints based on

  aluminum, or for coating paper.

  o Such an aluminum paste has a high covering power and the composition of microcrystalline waxes containing them, in accordance with the invention, exhibits excellent adhesiveness to various substrates, even if it is not very porous, due to the crystallization of waxes and microcrystals. the

flexibility of these.

  A subject of the invention is also the use of the composition of microcrystalline waxes defined above as reparaffining or dressing wax in the grafting of vine plants, in particular to protect the callus, after the stratification phase of the grafting process and

after root pruning.

  An unexpected result of this use concerns the so-called "stress" effect, which frequently affects grafted vine plants. Indeed, whatever the climatology and hygrometry concerning the budding of the young shoots of the reparaffined plant put in a nursery or in a pot and whatever the origin and the quality of the usual reparaffining waxes used, we generally note that the outlets vegetation takes place horizontally, with a frequent sagging towards the ground, before a resumption of vertical ascent, alas often followed by a

  desiccation announcing the death of the plant.

  The same phenomenon is encountered, even more markedly, on augured plants, kept for a few months in a cold room, and it is these harmful effects that those skilled in the art describe as a "stress" effect. Totally unexpectedly, this effect is considerably limited, or even completely eliminated, when using

  reparaffinage the wax according to the invention.

  In fact, the growth of vegetation takes place vigorously vertically, avoiding or limiting the mortality of plants due to stress. On plants emerging from stratification, the callus thus protected also avoids the burning effects due to infrared or ultra violet radiation, which are reflected up to 90% by aluminum particles or

  other metal housing wax composition.

  The composition of microcrystalline waxes according to the invention does not

  presents no risk for the photosynthesis of the treated subjects.

  The characteristics of a typical composition in accordance with the invention are as follows: - Melting point (C): 77 - 80 - Kinematic viscosity at C (mm2 / s): 11 - 11.4 - Penetrability with a needle 25 C (enl / lOmm): 25 Oil content (% by weight): at most 2 - Color: silver

- Density at 15 C: 0.8 - 0.9.

  The repeated tests carried out by the Applicant for the use of such wax compositions in the grafting process of vine plants have resulted in a systematic increase of at least 4% in the

nursery success rate.

s

Claims (5)

  1. Composition of microcrystalline waxes, characterized in that it comprises in combination: - from 94 to 96% by weight of a mixture of saturated hydrocarbons with branched chains and / or saturated hydrocarbons with cyclic chains; - from 4 to 6% by weight of a paste of lamellar particles of aluminum or of another metal accommodating dispersed in a paraffin support; - optionally from 0.4 to 0.6% by weight of a neutral additive, serving   0 dispersing agent and homogenization.   2. Composition according to claim 1, in which the saturated hydrocarbons with branching chains have the formula: CH3 (CH2) n CH3- CH - (CH2) n'CH -CH3 (CH2) n "CH3 on, n 'and n" , are integers, identical or different, of   2s preferably at least equal to 1.   3. Composition according to one of claims 1 and 2, characterized in   that the cyclized saturated hydrocarbons correspond to the following formulas: CH2 CH2 / \ / \ CH2 CH2 or CH2 CH- (CH2) n-CH3 1 1 1 1 CH2 CH2 CH2 CH2 \ / \ CH2 CH2   where n represents an integer at least equal to 1.   4. Composition according to one of claims 1 to 3, comprising a   mixture of saturated branched chain hydrocarbons and cyclized saturated hydrocarbons, characterized in that the saturated branched chain hydrocarbons represent between 40 and 50% of the mixture, while   s cyclized hydrocarbons represent between 10 and 30% of the mixture.   5. Use of a composition of microcrystalline waxes according to one   of claims 1 to 4 in the grafting of vine plants as wax   reparaffinage or dressing, in particular after the phase of