In the years 1999-2000 the studies on the population of true bugs colonizing the inflorescences of quinoa (Chenopodium quinoa Willd.) were conducted in Chrząstowo near Bydgoszcz. The dominating species was Lygus rugulipennis Popp. The species was recorded in 81.44% in 1999 and 83.64% in 2000 of all collected true bugs.
Occurrence of 20 predatory species of insects in a fallow, boundary strip and meadow was reported, 10 species occurring permanently in there habitats. The species frequency, dominance and richness differed among habitats.