Spring cabbage fly is a pest of garden crops belonging to the cruciferous family. This insect is very difficult to remove from its site. You can only take control measures that protect plants from its effects.
In color and size, it resembles a housefly. Departure from the soil, according to the observations of some vegetable growers, coincides with the flowering of birch, and the laying of eggs with a flowering cherry.
CABBAGE FLY LARVAE
Eggs are laid in cracks in the soil near the stems of plants. Hatching larvae of the cabbage fly immediately penetrate into still immature stems or root crops. They gnaw passages in the stalks of cabbage and in the roots of radishes, turnips, radishes, daikons. Plants are greatly weakened, they bind in sunny weather, root crops lose their market value. In the photo, the cabbage fly is at the stage of the larva and adult.
The larvae that have gained mass pupate near the plants damaged by them. At the beginning of July the flies of a new generation appear (2nd generation).
They are less harmful since the tissues of cultivated plants at the level of the upper soil layer and the ground layer of air become “rougher”, that is, difficult to access for new generation larvae. Therefore, relatively speaking, summer flies will cause great damage only to newly emerging shoots of cruciferous weeds.
CABBAGE FLY CONTROL MEASURES
Protective measures include planting healthy, strong seedlings in the early stages (preferably in peat pots) in order to “overtake” the phenophases of the development of spring flies.
After planting, no later than the first three days, it is necessary to conduct a deterrent dusting with tobacco (shag) dust with slaked lime or ash (1: 1), or with naphthalene, or with camphor. They try to apply the mixture as close to the stem as possible, because of which the fly will not lay eggs next to it. After 6-7 days, the reception should be repeated. These are the available measures to control the cabbage fly.
The eggs of the cabbage fly are white, clearly visible, and they can simply be removed from the stem. In the future, released larvae will die from exhaustion.
Loosening the soil, especially after rain and watering, improves the living conditions of plants. Hilling, especially after watering and top dressing, will contribute to the formation of additional roots, thereby increasing the resistance of plants to damage.
The eggs of larvae and pupae are eaten by Staphylinidae and their larvae. They are black, elongated (10-12 mm); beetles have short wings.
Eggs of a cabbage fly are damaged by red ticks (they are visible on the surface of the soil), which suck out the contents of the eggs.
The control of cruciferous weeds in their area and adjacent territories throughout the summer season will contribute to the fact that the clutch of eggs of summer cabbage flies will be “ineffective”, and practically no spring cabbage flies will be observed next spring.