About biology of wreckers Krestotsvetnykh – the bugs which are especially harming to cabbage, tells the author. In article it is paid attention to measures of fight against these wreckers.
Bugs are wreckers of krestotsvetny cultures, especially harm to cabbage. The rape and decorated bugs are generally widespread on Ukraine. Bug rape (EurydemaoleraceaL.) – an insect in length 5,5 – 7,0 mm, a bright green or dark blue color with a metal reflection. On a back some spots and strips of red, yellow and white color. The decorated bug (EurydemaornataL.) red color with small dark stains.
Adult bugs under the vegetative remains or in the earth on roadsides of fields, ditches and other places winter. In the spring wreckers eat in the beginning on weeds, and at emergence of shoots cultural krestotsvetny and sprouts disembarkation in large quantities fly on them. At the end of May beginning of June of a female postpone eggs for stalks and plant leaves in two ranks on six accurate eggs-bochonochkov with the convex lid, from below surrounded with dark rims. In 5-13 days from eggs otrozhdayutsya the larvae similar to an adult insect. One female can postpone on the average 60-80 eggs. Bugs develop in one generation.
At a vysasyvaniye of cellular juice from leaves or tsvetonosny escapes of krestotsvetny plants, the saliva of wreckers decomposes a chlorophyll, and on places having bitten the decoloured spots are formed. Leaves dry out, a flower and zavyazi are showered, seeds – immature.
Fight measures. Obligatory destruction of the vegetative remains, near cabbage to sow fennel, a fatseliya or semennik of carrots on which flower equestrians – natural enemies of bugs eat.
In due time to land sprouts and in due time to carry out waterings and top dressing (10 g of ammoniac saltpeter, 60 g of superphosphate, 20 g of potash salt on 10 l of water); the first – in 15-20 days after the sprouts disembarkation, the second – in 10-12 days after the first, the third – in 20-25 days after the second.
At mass settling of wreckers to carry out chemical processings by the following preparations: Detsis, 2,5 % k.s. – 2 ml on 10 l of water; Aktara of 25 WGv.g. – 0,6-0,8 g on 3 l of water.
A.Tkalenko, candidate of agricultural sciences.
(On Ogorodnik magazine materials).