Packaging container for the treatment of pupae
BACKGROUND OF THE INVENTION 
     The invention relates to a process for the treatment of pupae, for marking the insects hatched from these pupae and for the controllable release of these insects. 
     One way to control harmful insects is to release in an area where such insects are found more of the same insects which have been treated beforehand, e.g. which have been sterilized by a suitable form of radiation. The activities of the non-reproductive insects can at least reduce considerably the number of harmful insects. However, this form of control does not only require relatively large numbers of treated insects; it is also vital to make sure that these insects are effectively distributed over the area concerned, e.g. from an aeroplane. In addition to this, it is especially important to make checks on the effectiveness of distribution, e.g. by means of traps set up on the ground. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide an improvement in the process used for breeding pupae and treating hatched insects and to their subsequent controllable release. The invention also relates to a packaging container that is particularly suitable for use in connection with the treatment and release of these insects. 
     The pupae will be handled with a sterilizing radiation and they will hatch in an area in which the hatched insects will be marked with colour and the said insects will be influenced to leave the first area and to enter a second area. 
     It is possible to liberate these insects in a controllable manner and to check the distribution on hand of their colour marking. 
     A favourable packaging container to realize the inventive process has a developing compartment to fill with the pupae and a storage compartment for the hatched insects. Both the developing compartment and the storage compartment are connected together by a separating wall which is perforated with holes to permit the hatched insects to move into the storage compartment. 
     This inventive packaging container with two compartments is very simple to manufacture and very easy to handle. 
     In a favourable embodiment of the invention the packaging container is made as a folding box which is separated by an inwardly folded wall in two compartments, in a developing compartment and a storage compartment which is easy to open. 
     In a further embodiment of the invention one or more cardboard or paper sheets are inserted in the storage compartment in order to increase the wall surface in this compartment. 
     As a result of this more hatched insects can be stored in the storage compartment. 
     A further packaging container according to the invention has a lid over the developing compartment and the storage compartment, with three parts linked at the three free edges of the lid part laying over the developing compartment, which three parts lay on the outside of the sidewalls of said development compartment and are glued with these in the closed condition of the lid, and with a perforation line as connection with the lid part laying over the storage compartment, and with further perforation lines which continue the first perforation line along side wall parts connected with the lid parts and laying on the outside of the compartment sidewalls. 
     With these embodiments it is possible to tear open the storage compartment lid whilst the developing compartment is closed and the insects can hatch from the pupae and move in the opened storage compartment. 
     In a further development of the packaging container the side walls of the storage compartment are provided with fly openings for the insects which are closed by tear opening parts on the lid parts which lay on the outside of the storage compartment. 
     With this embodiment it is possible to set free the insects one behind the other and not all at the same time whereby a better distribution is given. 
     Within the invention it is also possible to displace the perforation lines on the lid to the storage compartment and away from the developing department. 
     With this it is sure that the developing compartment keeps closed when the storage compartment will tear opened. 
     A further favourable embodiment of the invention shows incisions cut in the side wall of the storage compartment opposite the development compartment. These incisions let light through to encourage the hatched insects to move from the development compartment to the storage compartment. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 shows a blank for the box; 
     FIG. 2 shows a box before it is filled and 
     FIG. 3 shows a box which has been opened to permit insects to escape. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The base section of the box consists of the base 11, the two long side walls 12, a short side wall 13 to which a part 31 of the lid is attached, a further short side wall 14, which is attached by means of two connecting pieces 15 to a separating wall 16 which has a gluing tab 17. The short side walls 13, 14 have tuck-in flaps 18, 19 which are partially tucked into slits 20, 21 in the long side walls 12 in the customary fashion when the box is erected. 
     The separating wall 16 is provided with a number of holes 22 which are large enough for the hatched insects to get through when they are still soft, but are not large enough for the pupae to get through. Between the side wall 14, the connecting pieces 15 and the separating wall 16 is the opening 23 which is designed to be as large as possible so that it is possible to fill the compartment as tightly as possible. Incisions 24, through which some light can enter the closed pack, are cut into side wall 13. The above-mentioned sections of the base part of the box are connected by means of the usual folding lines 25, 26, 27, 28, 29, 30. The box is made firstly by folding the end of the blank containing separating wall 16 along folding line 29 and gluing tab 17 on the base 11. After this, the base section is erected, with the development compartment 1 being formed between side wall 14 and the erected separating wall 16 and the storage compartment 2 being formed between the development compartment 1 and the other short side wall 13. 
     The lid of the box is made up of section 31 which is connected to the short side wall 13 via folding line 34; section 31 has two side pieces 32. When the lid is closed, sections 31 and 32 cover the storage compartment 2. Sections 31 and 32 are connected to sections 31a and 32a and a gluing surface 33, which are folded over the development compartment. The box is closed by gluing sections 32a and 33 of the lid to the surfaces of side walls 12 and 14 of the base section covered by them. Sections 31a, 32a and 33 are connected by normal folding lines 35, 36. The folding line between sections 31 and 32 or 31a and 32a is perforated by cuts in the surface of the board so that perforation lines 38, 39 are formed. A similar tear-open perforation 37 can also be added between sections 31 and 32. 
     The base section of the folding box is erected by machine. Lid sections 31, 32 are folded over storage compartment 2, whilst sections 31a, 32a are folded upwards along the tear-open perforation lines 38, 39, so that development compartment 1 remains open (FIG. 2). It is best to locate the tear-open perforation lines 38, 39 a short distance away from the separating wall 16 in the direction of the storage compartment, so that opening 23 is completely open and so that insects that hatch after the pack has been torn open cannot escape through opening 23. When development compartment 1 has been filled with a mixture of pupae, a powdery, fluorescent colourant and a filler, sections 31, 33 and 32, 32a are folded onto the base section, to which sections 32a and 33 are glued. 
     All or some of the perforation lines are torn open to release the insects. FIG. 3 shows a box with side section 32 torn open along perforation lines 39 and/or 37. After section 32 is torn open, an opening 3 is exposed which is formed by a section cut out of side wall 12 of the base section. If all the insects are to be released from storage compartment 2 at the same time and if any insects are also to be released, the lid of the box can also be torn open along perforation lines 38, 39 and folded up along folding line 34. The boxes can, for example, be opened easily either manually or in connection with simple throwing devices when being distributed from an aeroplane. 
     The folding boxes are a low-cost pack which can also therefore be used in the large numbers needed. They are not only eminently suitable for breeding and marking the insects; they also make it possible to distribute the insects evenly over a sizable area. The pack described here as an example can of course be modified in various ways, although it is best to make sure that the development compartment for the insects always makes up 10 to 20% of the total volume of the container, so that the pupae can be packed together tightly enough with the fillers and colourant to guarantee that the insects are marked with colourant on hatching before they move to the larger storage compartment.