Rhyacionia buoliana

Rhyacionia buoliana

Rhyacionia buoliana (Evetria - Retiña - Polilla del brote del pino)

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Location on the plant attacked: buds and buds.

DISTIBUTION: It is mainly found in the central system and surroundings.

Morphological characteristics:

Adults: The male is 18 to 21 millimeters in span and 8 to 9 millimeters in body length. The female, somewhat more robust, has 21 to 23 millimeters in span and the length of its body can reach 11 millimeters.

The head is cream colored, as well as the thorax and legs, making the coloration in the abdomen somewhat darker. Filiform antennas, composed of 55 to 60 pieces. Little developed spirit.

The forewings have, in general, reddish-reddish coloration, more or less intense, reminiscent of the buds of the pines, with caramel-colored drawings, rather confusing, and transverse silver lines, more or less irregular. A reddish sienna stain is characteristic near the inferior-external angle of the obverse thereof; the spot has a triangular shape, with the apex sharper towards the front edge. This edge is straight or slightly convex. Rear wings gray-brown, uniform, with a lighter stripe on its edge. In Spain there are several races with different wingspan and intensity of color.

.Puesta: Each female puts 70 to 80 eggs, in groups of two to five, which sometimes overlap each other, although they can also be found isolated.

The eggs are subelipsoidal, lenticular, 0.9 to 1.3 millimeters wide, flat on the lower surface and convex on the upper surface. Newly placed they are of a light yellowish color, which changes to reddish brown before their hatching. They are very difficult to find, not only because of their small size, but also because the laying is preferably carried out in the lower third of the needles, on their inner side, and, occasionally, in the terminal buds with whose coloration they are confused.

. Caterpillar: At birth, the caterpillar has an approximate length of 2 millimeters. After spending 5 changes, reaches in the sixth stage, at the end of its development, a length of about 15 to 16 millimeters; Exceptionally, there are specimens that can measure up to 21 millimeters.

In its first stage the general coloration of the body is yellowish-brown, standing out the head, pronotum (dorsal portion of the first segment of the thorax) and thoracic legs, dark brown, character that is preserved until the end of its development. During the second, third and fourth stages its coloration becomes darker, acquiring a reddish-brown tone that attenuates in the fifth and sixth stages. The anal gusset presents some small darker spots.

.Pupa: Sheathed type, like that of all lepidoptera. It is elongated and measures about 10 millimeters in length. Its color is bright brown and is provided with two transverse rows of teeth or spines on the back of each of the abdominal segments, except in the latter, which have a single row of small teeth. In the last abdominal segment it has 12 characteristic, hook-shaped setae. In the frontal region there is a very hard zone, which ends in a pointed shape.

They have a single annual generation, but the periods of each state can vary quite a few years to others. Generally adults appear between June and July. The life of the males is just over a week; the mating and laying occurs during the first twenty-four hours after the emergency. The eggs hatch after 12 days if the average temperature is 18.5 ° C, for each degree of less than that average temperature one day is delayed hatching. The caterpillar builds a silky tube and later enters a yolk. The winter passes in an inactive state, resuming its larval activity again to go to pupa for about fifteen or twenty days, after which the adult finally emerges.

Damage caused:

The caterpillars gnaw the yolks and buds, besides making galleries; These damages cause wilting, defoliation and, most serious, malformations that can end with the death of the trees.

RHBU SE
Data sheet
Format
Septum
Duration
45 days / 6 weeks
Affects
Forest
Units
1u

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Rhyacionia buoliana

Rhyacionia buoliana (Evetria - Retiña - Polilla del brote del pino)

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