THE EFFECT OF SOME INSECTICIDES ON THE LADY BUG (Coccinella 7-punctata L.)

Abstract

In Romania unfortunatly the use of insecticides for controling the pest it’s made without any respect for the beneficial fauna. One of the most known beneficial species encountered in almost any agricultural biotope it’s the lady bug Coccinella 7 punctata. The lady bug Coccinella 7 punctata it’s an predatory species that fed especially on aphids species and play an essential role in the biological control of these species. This paper present the research regarding the effect of some insecticides used for controling the mealy plum aphid Hyalopterus pruni Geoffr., to the lady bug Coccinella 7 punctata in the conditions from central Oltenia, at the Banu Maracine Didactical Station. The experience has been set up during 2005 - 2006, in a plum orchard from the Banu Maracine Didactical Station, of the University of Craiova. In order to study the effect of some insecticides on the lady bug there has been made observation in orchards as well in laboratory conditions.  The direct toxic action of the insecticides on the lady bug has been esatblished in field at 24, 48 and 72 hours after the apply of the treatments, counting the dead larva and adults. The effect of the insecticides through feeding with intoxicated aphids, has been establish in laboratory at 24, 48 and 72 hours.