2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Agalmatium two-bladed is found mainly in the south of Russia, as well as in the Mediterranean and Western Europe. This malicious pest attacks plants containing essential oils. His range of taste preferences includes parsley, mint, lavender, less often carrots and some other cultures. In the Mediterranean, two-lobed agalmatium damages mulberries, figs, olives, as well as sugar beets and a number of fruit crops, and in Western Europe it often attacks grapes as well. Both larvae and adults feed mainly on leaves. It is not at all difficult to detect the affected leaves - their surfaces are first dotted with dots and specks, and after some time, the damaged leaves begin to fade
Meet the pest
The size of the adult agalmatium two-bladed is from 4.7 to 5.7 mm. Males are characterized by a uniform and rather pale body integument. Sometimes on their front wings one can observe brownish indistinct darkening in the form of small stripes. The color of the females is more intense, moreover, their size almost always exceeds the size of the males. In principle, such a feature is found in nature in a huge number of insects.
Pale yellow convex eggs of parasites reach 0.9 mm in size. The bluish larvae are characterized by a short oval shape and are decorated with brownish indistinct patterns. In this case, the drawings may be completely different.
The eggs laid in groups (from two to twenty-two pieces) overwinter on perennial stalks of lavender, parsley, mint and a number of other plants. Female eggs are almost always laid on the shady side of the shoots in two rows (mainly on the eastern side - about 90%). They quickly become covered with dust and immediately begin to resemble adhering lumps of soil. As a result, it can be quite problematic to make out them, even if you take a good look.
The revival of larvae can begin in March and end at the end of June - it all depends solely on weather conditions. Each larva goes through five instars. Younger larvae are inactive and live mainly in weeds, while older larvae feed on parsley, mint, lavender and other plants, actively damaging the leaves, on which specks and dots appear. Gradually, two-lobed leaves attacked by agalmatiums begin to fade, which cannot but affect the volume of the expected harvest and its quality.
Adult leafhoppers fled approximately in June-July, as well as in the first half of August, and their mass appearance can be observed already in late June and early July. The harmful parasites immediately begin to feed. Adults feed exclusively on leaves. Having reached full maturity in the second half of July or in August, they mate and lay eggs that remain overwintering. During the year, only one generation of two-bladed agalmatium develops, however, this is quite enough to cause serious harm to the crop.
How to fight
On the plots, weed vegetation, attractive for harmful parasites, should be destroyed in a timely manner. Moreover, it is necessary to eliminate it not only where the two-bladed cultures, beloved by agalmatiums, grow, but also in the surrounding environs.
Insecticide treatments will be advisable only if harmful leafhoppers damage about 25 - 30% of the total leaf surface. Therefore, the amount of damage caused by gluttonous parasites must be constantly monitored. As a rule, insecticide treatments are carried out in late July or early August. Chlorophos is perfect for these purposes.
But, unfortunately, it is not possible to get rid of two-bladed agalmatium manually.
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