2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The rape flower beetle, which lives almost everywhere, willingly feasts on the seed plants of oilseeds and cabbage vegetable crops. Sometimes it can be found on beet plantings, on flowers of legumes, as well as on fruit plants and a number of other crops. The gluttonous larvae of the rape flower beetle, eating the contents of the buds, are especially harmful. As a result of their attacks, the buds die off rather quickly, which in turn cannot but affect the volume of the crop and its quality
Meet the pest
The rape blossom beetle is a harmful bug that grows up to 1.5 - 2.7 mm in length. These voracious garden enemies are endowed with oblong flat bodies and are painted black with a pronounced blue or green metallic sheen. The black-brown legs of these parasites are rather short, and their antennae are decorated with three-membered clubs.
The size of oval smooth white eggs of rape flower beetles averages 0.3 mm. The worm-like larvae, which grow up to 4 mm in length, are pale gray in color and endowed with three pairs of legs. Their chair is brownish, and the whole body is covered with tiny black warts. The length of free pupae reaches 3 mm. All of them are pale yellow in color and differ in an egg-like, slightly flattened shape.
Wintering of adults is observed on the soil surface under fallen leaves or under plant remains at forest edges, as well as in parks and gardens. Approximately in April or at the beginning of May, the bugs begin to spread over the flowers of various wild-growing crops (saffron, dandelion, buttercup, common whitewash, etc.), and some time later they move to the growing testes of cabbage crops (turnip, rape, radish, rutabaga, rapeseed, cabbage, etc.). Additional food for harmful parasites is the inner parts of buds and flowers, in which they gnaw with appetite pistils with stamens and petals with anthers. The buds attacked by them gradually fall off, and with rather weak damage, after some time, they are transformed into ugly pods, characterized by low quality seeds and low yields.
Eggs are laid by female rape flower beetles, one or two per bud. And the total fertility of pests reaches about fifty to sixty eggs. After five to nine days, the larvae hatch, eating the inner parts of the flowers with buds - anthers are especially loved by them, but the gluttonous parasites do not refuse young pods either. On average, the development of larvae takes from fifteen to twenty-five days. Having finished developing, they deepen by 2 - 5 cm into the surface soil layer, where they pupate a few days later. The development of pupae takes from ten to twelve days in time. The adults appearing in June and July feed for a certain time on flowers of all kinds of crops, after which they move to wintering places. Only one generation of rape flower beetles manages to develop per year.
How to fight
In areas where cabbage crops are grown, weed vegetation should be eliminated with its subsequent destruction. The destruction of post-harvest residues along with autumn fall plowing is also very important.
During the period of mass pupation of rape flower beetles, careful soil cultivation will serve well. In the event that each plant has five or more bugs, it makes sense to spray the seed plants during the budding period. Suitable drugs for such purposes will be "Break", "Borey" and "Sharpay". A drug called "Karate Zeon" also helps to achieve a good effect.
Predators Aneuclis insidens Thoms also help to reduce the number of harmful rape flower beetles, and Phradis interstitialis Thones often parasitize on voracious larvae.
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