RO129688A2 - Synthetic bait for the spruce bark beetle, ips duplicatus l. - Google Patents

Abstract

The invention relates to a synthetic bait intended to lure bark beetles Ips duplicatus. According to the invention, the bait comprises an envelope () of polyethylene foil having a foil thickness of 50 μm and internal dimensions of 50x70 mm, heat sealed by some seams () wherein there is a cellulosic material () impregnated with a mixture of volatile substances, protected against oxidation.

Description

SYNTHETIC SWIMMING FOR THE DUMPING MOUTH, IPS DUPLICATUS L.

The invention relates to a synthetic trap intended to attract bark beetles Ips duplicatus in specific traps (Intercept®, Theyshon®, etc.), approved traps that are commonly used also for capturing other insect species in forest protection works in forest area.

Ips duplicatus is an important spruce pest, considered invasive in Central and South Eastern Europe, which causes significant damage to spruce trees at altitudes below 800 m, damage consisting of drying trees on important areas (DAISIE, 2009: Handbook of Alien Species in Europe - Springer, Dordrecht, 399 pp. EPPO / CABI: Quarantine pests for Europe - 2nd Edition - Smith, IM, McNamara, DG, Scott, PR, Holderness, M. (Eds.), CAB International, Wallingford, UK, 1996, p. 1425).

Monitoring the populations of this species of harmful insect is essential in the activity of managing the types of forests in which the spruce predominates. Thus, as with other species of bark beetles, for Ips duplicatus population monitoring is done by two methods:

- direct observation and inventory of the attacked trees, establishing the complex of insect species that produced the attack;

- the chemo-ecological method, of attracting insects of interest to trapped traps with different types of pheromone nests characteristic for each species of pests.

The methods listed above have specific advantages and disadvantages. The first method has the advantage that it is very precise, but it has disadvantages due to the obligation of the use of specialized personnel who have to verify the trees with risk of attack at regular intervals of time, often the productivity of the attacks reports being reduced, thus significantly limiting the scope. The second method has the advantage of being productive, being widely applicable to different species of insect pests, without requiring specially trained personnel. As a disadvantage, until now this method could not be used properly for the detection and monitoring of Ips duplicatus bark beetles, as the specific broods used (ID-Ecolure - Slovakia and Dupliwit - Austria) have proved inefficient for Ips duplicatus populations. from Romania.

The technical problem solved by the invention consists in the realization of a specific pheromone nest for the populations of Ips duplicatus in Romania, to be used in the process of detection and monitoring of this pest under optimal conditions.

Synthetic nothing is based on a specific mixture of volatile chemicals that has the role of attracting olfactory adults of Ips duplicatus, a mixture that is stored in a device that ensures its constant diffusion depending on the temperature of the environment, a device referred to as a dispenser.

The synthetic swim dispenser consists of a small envelope made of low density polyethylene foil, 50 μm thick, with internal dimensions of 50 x 70 mm, ~ 4 ~

2 0 1 3 - 0 0 0 8 3 - ^{2 4} -01- 2013 envelope containing an absorbent cellulose material with dimensions of 40 xx 3 mm, which has the role of storing the specific attractive solution.

This solution consists of a mixture of synthetic chemical components that mimic the natural pheromone components of Ips duplicatus as well as the kairomonal ones characteristic of the attacked spruce trees, to which a solvent and an antioxidant are added.

The pheromone components have the role of attracting insects from a long distance to the trap, they mimic the natural pheromone odors emanating from other adults of Ips duplicatus that have identified a favorable tree for colonization, and the kairomonal ones have the role of directing the insects to the trap, they imitate through the concentration and the released spectrum, the scents characteristic of a weakened spruce tree, unable to react to the attack of bark beetles.

Thus, the synthetic attractive mixture is composed of the synthetic pheromone components racemic ipsdienol (2-methyl-6-methylene-2,7-octadien-4-ol) and Emircenol ((E) -2-methyl-6-methylene-2,7 -octadiene-1 -ol), the synthetic kairomonal components (-) alpha-pinen ((1S, 5S) -2,6,6-Trimethylbicyclohept-2-ene) and (+) limonene ((R) -4-lsopropenyl- 1-methyl-1-cyclohexene) and the support (solvent) component of the mixture: methylbutenol (2-Methyl-3-buten-2-ol). To this mixture is added the antioxidant BHT (butylated hydroxytoluene).

The ratio of the components of the attractive mixture for Ips duplicatus is:

Ipsdienol: 1 E-mircenol: 17 Methylbutenol: 0.5 (-) alpha-pines: 0.5 (+) limonene

The antioxidant BHT is used in the amount of 2.5 g BHT salt for 100 ml attractive mixture.

The mixture of attractants is released by the dispenser through the pores of polyethylene foil, at a rate of 20 mg / day (20 ° C, 50% RH).

The amount of attractive mixture used for a pool is 3.0 ml. The duration of the attraction in the field is 6-8 weeks, depending directly on the weather.

By applying the invention, the following advantages are obtained:

- there is a specific efficient and attractive low cost crate that can be used to monitor Ips duplicatus populations in Romania;

- the use of the bathing is simple and does not require specialized personnel;

- by using this nest in the specific activities of forest protection, a correct evaluation of the presence and size of the bark beetle populations of the Ips duplicatus spruce will be obtained.

The following is an example of the invention in connection with the invention

Fig.1- Front view (a), Vertical section (b), Horizontal section (c) of the synthetic butt for Ips duplicatus

The synthetic swim dispenser for Ips duplicatus consists of a LD polyethylene envelope 1 with a thickness of 50 µm, sealed by thermal welds 2, in which an absorbent cellulose material 3 is introduced for the purpose of storage.

Oc 2 0 1 3 - 0 0 0 8 3 - - ² 4 -01- 2013 attractive mixture made up of the volatile substances ipsdienol, e-mircenol, methylbutenol, alpha-pinene and limonene.

Mode of action of the swim:

The pheromone nest is mounted in the central area of specific traps for the capture of bark beetles (Intercept®, Theyshon®, etc.). It releases attractive mixing quantities that vary depending on the temperature of the environment. The volatile substances once released into the atmosphere are identified by adults of Ips duplicatus on the fly, which are thus attracted to the trap in which they will be captured.

Traps thus primed with nests are located at least 12 m away from the edge of the forest attacked by bark beetles Ips duplicatus, never settling inside the forest. The minimum recommended distance between two traps is 15 m.

For a proper attractiveness of the traps, the traps must be checked weekly on which occasion the captured insects are harvested, which, if they would stay longer in the traps would enter the rot, the odors thus resulting by masking the pheromone nodes.

Claims (1)

Synthetic nose for the spruce bark beetle, Ips duplicatus L., characterized in that it uses as attractive a mixture of volatile substances in the ratio: 1 Ipsdienol: 1 E-mircenol: 17 Methylbutenol: 0.5 (-) alpha- pinene: 0.5 (+) limonene, which is protected against oxidation with BHT (2 g / 100 ml), a mixture which is impregnated in a cellulose material (3) inserted into a LD polyethylene sachet (1) with thickness 50 pm film and with internal dimensions of 50 x 70 mm, envelope which is closed by thermal welds (2).