2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The beetroot beetroot can be found almost everywhere. It damages not only sugar beets, but also marigold with quinoa. Moreover, the bugs themselves and their larvae cause harm: the bugs, together with the larvae of older instars, make through passages in the leaves, and the larvae of younger instars gnaw ulcers on them. Accordingly, we have to fight both with those and others
Meet the pest
Beetroot beetle is a harmful beetle, the length of which is about 6 - 7 mm. From above, it can be rusty-brown or brownish-green in color, with small specks of black on the elytra. The edges of the elytra and pronotum are black and slightly spread ventrally. The size of oval eggs ranges from 0.4 to 0.5 mm. The eggs of the beetroot beet are usually light yellow in color, and on top are covered with thick mucus that solidifies and looks like a transparent film.
The size of the larvae of the pest is 7 - 8 mm. The larvae themselves are yellowish-greenish and endowed with reddish heads. And the length of the flat bright green pupae is approximately 6.5 mm. They look very interesting: on the sides they have two yellow stripes and five serrated lobes, and on the back there is a long dark stripe.
Half-ripe beetles usually hibernate in vegetation litters; this often occurs in sparse tree plantations, as well as in numerous thickets. Beetles begin to emerge from wintering grounds in April. In warm daytime hours, they move to weedy areas, where they feed on weeds. And with insufficient humidity and rising temperatures, pest beetles eat marigolds in large quantities. Five to eight days after the start of additional feeding, parasites mate.
Beetroot beet eggs are laid in characteristic compact heaps (each of them contains from eight to twenty pieces) both on the upper and lower surfaces of the leaves. Then they fill the laid eggs with instantly solidifying mucus, which transforms into a translucent yellowish film. The laying process takes approximately fourteen to twenty days, and the total fertility of females ranges from 150 to 200 eggs. As for the stage of embryonic development, it takes no more than 4-6 days.
Larvae are born in the second half of May or early June. Their development, which takes place in five periods, lasts (depending on the weather) from fifteen to thirty days. Pupation of harmful larvae is open and is mainly observed on leaves of forage plants. They are attached to the leaves by the rear ends of the calf, where they are subsequently transformed into pupae, shedding their molar skins. Pupae develop on average 8 - 12 days.
The appearance of beetles in the steppe and forest-steppe zones is noted in the second half of June or at the beginning of July. For 12 - 16 days, they are actively feeding on vegetation, after which they mate with subsequent laying of eggs. The emerging larvae of the second generation start feeding on beets and pupate at the end of their development (usually in the second half of August). And in September, after completing additional feeding, which lasts 10 - 12 days, they move to wintering places.
How to fight
Fly larvae and various predatory bugs are good helpers in reducing the number of beetroot scutes. Eggs of gluttonous pests are periodically infected with salvage chalcids, and Eulophids can often parasitize on pupae with larvae.
In order to avoid attacks by beet shields, it is necessary to constantly eliminate from the site weeds from the haze family, which is extremely attractive to them. It is also recommended to sprinkle the area with tobacco dust and carry out the treatment with onion peel infusion or ash infusion.
Insecticide treatment is advisable when at the beginning of sprouting there is one beetle for each square meter, and at least a dozen larvae appear on one plant in the phase of formation of 2-6 leaves. Insecticides such as Phosphamide, Metathion and Decis have proven themselves quite well.
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