2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The rosewood sawfly is found almost everywhere. Wonderful roses are the object of his close attention. The harm caused by the rose sawfly is quite noticeable, especially when you consider that in the southern regions as many as three generations of this pest have time to develop in a year. And with a large number of this enemy of roses, beautiful plants in the shortest possible time can lose not only thin shoots, but also all leafy cover
Meet the pest
The size of the adult sawflies reaches 7 - 10 mm. They are painted in blackish-yellowish color and are endowed with a black breast, head, legs and tops of legs. And their wings are of a delicate yellowish tint. The abdomens of females, in contrast to males, are more thickened. In addition, their body is more pointed at the tip and equipped with an ovipositor.
Eggs of rose sawflies are relatively small in size, translucent, with a slight yellowish-white tinge. The size of the larvae is about 17 mm, although the larvae that have just emerged from the eggs are much smaller - their length is only 4 mm. Initially, all the larvae are translucent and white, and upon reaching older instars, they acquire a bluish-greenish color with bright orange backs. On each annular segment on the sides of the body, they have tiny black warts; the orange chair is also decorated with black specks.
Yellowish-white pupae are in light brown two-layer cocoons. Their outer pale yellow layer is rather cellular and fragile, and the inner hard and thin layer is equipped with a shiny shell wrapped in larvae. In width, such bizarre cocoons reach about 5.1 mm, and in length - 10, 2 mm.
Wintering of pests of roses takes place under rose bushes in the surface soil layer. From May to July, adults can be observed. Their lifespan is very short - about five to six days, although with the presence of additional nutrition, some individuals are able to live even nine to ten days. The total fertility of females is up to seventy eggs. They usually lay eggs in two or three passes, one thing at a time under the bark of young shoots that have not yet become stiff (in the so-called incisions-pockets). Each oviposition contains an average of eight to ten eggs (sometimes up to forty). In places where eggs are laid, the shoots begin to bend and crack. And when larvae emerge from them, many depressions in the form of chains with noticeably protruding shells of laid eggs remain in the shoots. The duration of embryonic development of rose sawflies takes about nine to eleven days. The larvae do not leave the egg-laying simultaneously, but over the course of one to three days. In the larval stage, pests stay from twenty to thirty days, and during this time all the larvae have time to develop at as many as five instars and shed four times.
Younger false caterpillars live in families and skeletonize rose leaves, while older caterpillars gradually crawl over all bushes, unceremoniously nibbling on petioles and leaves. If there are quite a few of these parasites, then they are able to completely bare all the pink bushes. The harmful larvae, which have reached the last instar, descend along damaged shoots into the soil for subsequent pupation. In the pupal stage, rose sawflies remain for about two weeks.
How to fight
The planting of roses must be carefully looked after, and the care must be timely - this will allow the roses to develop better, and also increase their resistance to all kinds of damage. It is also recommended to select the varieties of roses most resistant to the rose sawfly.
In late autumn, it is necessary to thoroughly loosen the soil - such a measure will contribute to the death of the overwhelming majority of harmful pupae. And all dried and damaged shoots must be cut off and subsequently burned.
A good measure to combat the rose sawfly is to spray rose bushes with wormwood broth with the addition of a small amount of soap (40 g of soap and 300 g of wormwood per bucket of water).
With a sufficiently large number of pests at the initial stage of budding, planting of roses is selectively treated with insecticides. The best helpers in this case will be such drugs as "Aktara", "Fosbecid", "Actellic" or "Intavir".
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