The investigation was conducted in the period Мау - September, 201 О, in а population of Chondrilla juncea L. located near the town of Plovdiv. Dynamics of the population density of two noctuid moths, Schinia cognata Fr. and Simyra nervosa D.&Sch. was recorded. Both moths develop two generations per year. The active flight is in July and August, respectively. The larva feed on the generative parts of the host plant. Schinia cognata has already been included in the list of potential agents or biological control in the USA. Some more studies on the feeding potential and hos testing of Simyra nervosa are needed.
Population dynamics of Schinia Cignata Fr. (Lepidoptera: Noctuidae) and simyra nervosad & Sch. (Lepidoptera: Noctuidae), natural enemies of Chondrilla Juncea L. (Asteraceae) in the region of Plovdiv