Carpocapse of apples and pears

Description

The adult insect is a butterfly of 18 mm approximately of scale whose former wing S are grisâtres, with at the ends a broad brown spot bordered of gilded lines. The posterior wings, uniformly brown have the ciliés edges. The head carries two spread out thread-like antennas. The larva is a caterpillar 1,8 mm length (young person) to 5 mm approximately front Diapause, to the pale pink body and brown head dark.

Biology

The carpocapse of the Pomme S is a Lépidoptère (butterfly) of the family of the Tortrixes. Of enough small size, 15 to 22 Misters It take off in the twilight when the temperature reached 16°C (May at September) and lay on the sheets, the stems or the eye of the fertilized flowers. The larva often penetrates in the fruit by the eye but not always. The first generation is not most dangerous. The second generation appears in August. The females lay on the healthy fruits and the caterpillar penetrates by an unspecified point. It affectionate particularly pips. The hole of exit of the larva is noticed by the accumulation of dejections. When it is ready, it leaves its host. Either it joined the ground with him and hides in some hole, or it remains on the tree and takes refuge in an anfractuosity of the bark, and both cases, it nymphose in a cocoon blanchâtre to wait next spring.

Means of fight

There exist several means of fight against this ravageur. It is before very necessary to privilege the means of fight which are respectful Environnement. Among those, here the most effective methods:

The bands traps

It is possible to install bands traps (corrugated cardboard) of a score of centimetres broad on the trunks of the apple trees (with more than 20 cm of the ground). These bands capture the larvae of carpocapses which seek a shelter to metamorphose themselves. It is necessary to install the bands as of June and to on the spot maintain them until September for then destroying them, by burning them for example.

Traps with Phéromone S

These traps available in the trade attract the male carpocapses on limed plates. These traps can be used to limit the population of butterflies present in the orchard. It is advised to couple the installation of these traps with another means of fight, as the bands traps for example.

In the same kind of fight, there exist diffusers of hormones (Isomate C or Gingko). it is a biological means of fight intended for the professionals since its effectiveness rests on the number of diffusers posed compared to a surface (one speaks about 400 to 400 diffusers/hectare). The diffusers resemble iron wire of small size covered with impregnated plastic of female sex hormone of the carpocapses. Placed in the trees, the phéromone is diffused in the air, disorientating the males which become exhausted to find the females. In great majority, the males die before to have been able to couple and fertilize the females.

Biological insecticides are also available, most effective (because most selective) are the products containing viruses of the Granulose (carpovirusine) which, if they are positioned at the good moment, can strongly limit the populations of carpocapses in place.

Lastly, the installation of nesting boxes to support the presence of insectivorous birds in the Verger makes it possible to reduce the populations of carpocapses. Among the species to be supported, one finds the Mésange S blue and coal, but also the majority of the Chauves-souris which consume great quantities of larvae or butterflies.

See too

List of the ravageurs of the crop plants

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