2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The green scabbard lives almost everywhere. Besides mint, it can damage some other crops. These harmful bugs eat leaves along the edges with appetite, and sometimes eat out pretty decent holes in them. In some cases, they can also damage leaf petioles with young stems. Gluttonous larvae populate mainly the lower sides of the leaves, where, without affecting the upper epidermis, they quickly gnaw out the parenchyma. And the epidermis dries up and ruptures after a while
Meet the pest
The green scabbard is a malicious beetle from the leaf beetle family endowed with a wide-oval body, the size of which ranges from 7 to 10 mm. The upper sides of the bodies of these pests are characterized by dull green shades, and their lower sides are painted in black tones (with the exception of wide yellow edges along the edges of the abdomen). Occasionally, the entire undersides of the abdomens may differ in yellow color. The bases of the antennae and legs of green scutellus are usually also yellow, and the pronotum of voracious parasites cover their body, like a reliable shield.
The size of mint lovers' oval eggs is about 0.5 mm. And the larvae, which grow up to 9 mm in length, are painted in grassy green tones and are endowed with greenish heads with brownish tips. The ellipsoid bodies of the larvae slightly widen towards the posterior dorsum, and their sides are equipped with a huge number of branched processes.
Green pupae reach in size from 8 to 10 mm, and on the sides of their bodies, you can see from thirty to thirty-five spine-like outgrowths.
Beetles overwinter under bushes, trees and in forest belts in the middle of dry grass. They awaken approximately at the end of April and at the beginning of May, after which they quickly migrate to fodder plants, where they begin active feeding. As soon as the additional feeding of the voracious parasites is complete, they mate and begin to lay eggs. The total fertility of these enemies of mint reaches from one and a half to two hundred eggs. By the way, they lay eggs in groups in the form of globular heaps, each of which contains from six to eighteen eggs. Females usually place eggs on leaves with stalks, and cover them with thin films on top. The egg-laying process lasts about twenty days, and embryonic development covers a period from four to seven days.
At the end of May, you can see the appearance of the first larvae, and their mass release occurs in June-July. All larvae develop at five instars and shed four times in the process of their development. Moreover, they feed on vegetation from twenty to thirty days. The hatched larvae almost always skeletonize the leaves, and the older larvae often gnaw right through them and completely destroy them.
Immediately before pupation, the larvae attach to the plants with the tips of the abdomen (mainly on the lower sides of the leaves), where, after some time, they turn into pupae, which remain hanging with their heads down. In the pupal stage, harmful parasites stay for six to nine days. Approximately from the end of June to the first half of August, bugs of a new generation appear, feeding for fifteen to twenty days. The well-fed parasites immediately go to winter. During the year, only one generation of these mint lovers manages to develop, although in some regions sometimes two or three generations develop. The most harmful is the first generation of gluttonous parasites.
How to fight
If on mint plantings there are quite a lot of bugs and their larvae, then it is advisable to spray with the drug "Decis". It is important to take into account that the last treatment should be carried out no later than twenty-five days before the mint harvest.
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