Creepers are pests of lily crops. In Russia, these flies are ubiquitous.
The most common and therefore the most dangerous pests are two species - tubercle beetle and onion beetle.
These flies are most harmful to plants of the onion and lily family. And larvae of beetles can damage potatoes, sugar beets, tomatoes and carrots. Onion beetles do the most harm to garlic, onions and such ornamental plants as roosters and lily.Beetle (Syrphidae).
Creepers have average sizes of 5-10 millimeters. The body of the insect is stocky, the hind femora are thickened.
The color is bronze-green with a metallic overflow. On the abdomen there are lunate whitish spots. The hilly little creepers have small mounds on their hips - this is the main difference between them and onion creepers.Creepers feed on plant sap.
The eggs of the little beetles are red and white. Their length ranges from 0.6-0.8 millimeters. The shape of the eggs is oblong, with pointed front ends and rounded posterior ends.
Larva is pale yellow or gray. She has a flat back, and the abdomen, on the contrary, is convex. On the back of the body, the larva has a chitinized process of a red or brown color with a pair of spiracles. The adult larva reaches 10-11 millimeters in length.
The pseudo-window is black-brown in color, about 8 millimeters long.As soon as it gets warmer, flowers begin to bloom, small gulls fly out of their dwellings.
Larvae of the third age spend the winter in bulbs at a depth of about 5-8 centimeters. In spring, when the earth warms up to + 7-8 degrees, the larva begins to show activity.
In the south - in Crimea, the flight of beetles begins in April-May. And in the steppe and forest-steppe zones of Russia, flight begins in the second decade of May.Mating nets require nectar and pollen from plants.
For mating, these flies additionally require pollen and nectar. A fly lays eggs individually or in small heaps consisting of 3-10 eggs. They lay eggs on lumps of earth next to the bulbs or on the leaves of plants. One female beetle brings up to 100 eggs.
During development, the larvae feed on the tissues of the bulbs. As a result of such exposure, the bulbs rot. In one onion can be up to 30 larvae of beetles. As a rule, beetles lay eggs in diseased plants or plants affected by other pests.
Eggs develop in about 5-10 days, it all depends on temperature, larval development takes 14-22 days, and pupae form for about 10 days. Under favorable conditions, one generation develops within 30 days.Larvae of female beetles feed on bulb juice.
In our country, for one season, little buggers manage to give two generations. Larvae of the second clutch hibernate at the end of August, so they spend the winter.
Sometimes the larvae of beetles with bulbs penetrate the vaults, and from them fall into the onion fields.