Results obtained in the biological control of western corn root worm, Diabrotica virgifera virgifera Le Conte (2007-2010).

摘要

To establish a pest control strategies in an agroecosystem, the first requirement is the correct diagnosis and identification. In the literature there is much information about the chemical control of the species Diabrotica virgifera virgifera Le Conte. In biological control, which is the subject of the present article, we used the bioproduct "BIOBIT" based on Bacillus thuringiensis either as seed treatment or vegetation treatments. To determine the efficacy of the product against the western corn root worm, since the spring of 2007 there was organized an experimental field in the area of Tartaria, Alba County (Romania). The experiments were made according to the experimental technique. Experiment located in an area where the pest has been reported since 2002, under monoculture. Sowing date varied from year to year depending on climatic factors and weather conditions. In 2008 sowing took place on April 21, May 1 in 2009 and April 30 in 2010. During 2008-2010 for preventing and fighting against Diabrotica virgifera virgifera Le Conte species larvae, the best results were obtained with products applied to the seed. In the experimental period, the larvae attack symptoms were manifested by the appearance of "goose neck", in control plot, the attack frequency being about 33.36% in 2007, 15.46% in 2008 25.33% in 2009 and 26.88% in 2010. Biobit bioproduct applied only to the seed reduced the incidence of attack to 6.92% in 2007 (79.2% less compared to the control), 5.76% in 2008 (about 71% less compared to the control), 5.76% in 2009 and 6.23% in 2010.