13. Interaction between some leaf fertilizers and the density of Colorado potato beetle eggplant crops (Leptinotarsa decemlineata Say)

Colorado potato beetle – Leptinotarsa decemlineata Say is the major pest of eggplant. In that relation the aim of the present investigation was to study the effect of leaf fertilization on the density of Colorado beetle. The investigation was carried out during the period 2003 – 2005 on the Training-and-Experimental Fields of the Department of Horticulture, the Agricultural University – Plovdiv. The experiment was set by the block method in four repetitions and 15 variants. Patladzhan 12 cultivar was used. The density of Colorado beetle larvae and adults was reported once weekly by the method of bush assessment.
As a result of the conducted study it was established that the tested formulations and combinations of leaf and soil fertilizers had different effect on the density of Colorado beetle.