2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Narrow-bodied rosacea damages mainly rose hips and essential oil roses. These harmful bugs damage the leaves very badly, actively eating them along the edges. Shoots struck by merciless pests break off without much difficulty, the leaves on them are small enough, the buds gradually turn yellow and fall off, and the number of beautiful rose flowers decreases by about 20 - 40%. Often, there is also a complete drying out of not only individual branches, but also whole rose bushes. In order to admire the lush blooming of roses to your heart's content, you should direct your maximum efforts to combat these scoundrels
Meet the pest
Narrow-bodied rosaceous beetle is an oblong beetle, the size of which ranges from 4.5 to 6 mm. And the color of these merciless pests can be very changeable: from metallic green shades, it goes to golden copper, and sometimes to bronze-black tones.
Ellipsoidal eggs of narrow-bodied rosaceous beetles are dull white with a slight creamy shade. And the flat narrow larvae, growing in length up to 15 mm, are characterized by the absence of legs. Immediately after the revival, they are white and translucent, and upon reaching older ages, each individual acquires a creamy shade. The brownish pupae of the pests are of a free type.
Larvae that have finished developing overwinter most often inside the shoots. Towards the end of April, as well as in May and June, they begin to widen their passages and actively eat away numerous chambers, in which they will subsequently pupate. The pupal stage lasts two weeks.
As soon as roses bloom (most often their flowering can be observed already at the beginning of June), harmful bugs begin to get out. Their years in most cases lasts until the beginning of August. About a week and a half after additional feeding, the females begin to lay eggs. Pests place them one or two on the shoots, at a height of five to fifteen centimeters above the soil level. All freshly laid eggs of the female are abundantly lubricated with the fluid secreted by their accessory sex glands. Gradually, this substance hardens, taking the form of a shield that protects the egg from drying out. The total fertility of harmful females is from thirty to sixty eggs.
Eighteen to twenty six days later, voracious larvae revive under the shields, instantly penetrating into the shoot bark. During feeding, they form bizarre rings in plants, and also make elongated and spiral passages. The bark in the damaged areas quickly darkens and rises slightly, as a result of which numerous growths-tumors form on the plants.
The larvae that have finished feeding until the onset of spring remain inside the shoots. For rosaceous narrow-bodied goldsmiths, one-year generation is characteristic.
How to fight
The main preventive measure against rosaceous narrow-bodied goldsmiths is proper and thorough care of rose bushes - this will significantly increase the resistance of beautiful flowers to the attacks of merciless pests. And even if the bushes have already been attacked by them, with good care of the roses, the passages made by harmful parasites often overgrow, and the shoots begin to bear fruit normally.
Growing varieties of roses that are resistant to damage from harmful parasites is another great measure.
With the onset of spring, until the years of bugs have begun, all wilted and dried shoots must be cut off and immediately destroyed. And at the initial stage of rose budding, luxurious bushes are treated with various insecticides.
If there are few pests on the site, then it is quite possible to collect the larvae by hand and subsequently be sure to destroy them.
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