2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Mesh Roll is a great fan of plums with cherries and apple trees with pears. True, sometimes she is not averse to feasting on leaves of currant and raspberry berries, and a little less often she can attack even beautiful roses and some forest species. Harmful larvae are very harmful to fruits, eating out rather solid areas on their surfaces. To save the long-awaited harvest, these dangerous pests must be fought against
Meet the pest
The reticulated leafworm is a harmful butterfly with a wingspan of 15 to 22 mm. The front wings of the pests are painted in light brown or ocher-yellow tones, and the elements of the fanciful patterns decorating them are characterized by a rusty-brown or reddish-brownish color. Each pattern is formed by a small basal area, an oblique median band strongly widening in the lower half of the wings and a wedge-shaped pointed and elongated preapical speck. And the preapical spots, in turn, merge with the outer extreme spots, which are narrow stripes. The translucent hind wings of reticulate leafworms are distinguished by a light brownish-grayish color and are framed by a small fringe.
The wingspan of males is about 14 - 18 mm, while in females it is 18 - 23 mm. The fore winglets of males are always brownish-yellowish with pronounced brownish reticulation and brownish or reddish-brownish patterns. And the front wings of females are characterized by a predominance of grayish shades, slightly longer and a noticeable reduction in patterns.
Rounded eggs of reticulated leaf rollers have the appearance of slightly flattened discs and are colored yellowish-greenish or light yellow. And the ovipositions of pests are in the form of scutes and are somewhat reminiscent of varnish-shiny yellowish-greenish diffuse droplets reaching a diameter of 2 to 6 mm. Each clutch contains from twenty-five to one hundred and sixty-five eggs (on average, from eighty to ninety eggs).
The worm-like larvae of harmful parasites grow in length from 18 to 22 mm, and their color can vary from dirty or dark greenish to olive or yellow-green. In the larvae of younger instars, the thoracic legs, prothoracic scutes and heads are usually blackish, and upon reaching each older individual they become light brown or honey-yellow. And on the abdominal legs of the larvae, you can see crowns consisting of 50 - 58 tiny claws. As for the pupae, their size is usually 8 to 13 mm. At first they are painted in ocher tones, and a little later they turn dark brown.
Years of butterflies of the first generation starts one and a half to two weeks after the end of flowering of apple trees, and its average duration is three to four weeks. As a rule, massive years of pests can be observed in the first half of June. And in the middle or at the end of July, the second generation of butterflies flies out.
Approximately three to four days after the flight, the pests begin to lay eggs. The temperature range in the range from twenty to twenty-two degrees is especially favorable for this process. If the thermometer rises above thirty degrees or drops below twelve degrees, the laying of eggs stops. All female clutches are placed on the upper sides of the leaf blades, however, sometimes they can be seen on the lower sides of the leaves. And the total fertility of reticulated leaf rollers ranges from twenty-five to one hundred and sixty-five eggs. The embryonic development of the first generation of pests takes from one and a half to two weeks, while in the second generation this process takes eight to ten days. After this time, harmful larvae begin to emerge from the eggs. During each season, two generations of these gluttonous parasites develop.
How to fight
The areas of tree boles damaged by mesh leaf rollers must be systematically cleaned of the upper dead layer of bark. After the entire crop is harvested, these areas are cleaned and treated with a concentrated solution of "Chlorophos". And in the spring, you can also re-treat the boles damaged by pests (the air temperature during this process should not be lower than fifteen degrees).
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