In the years 1977-1979 and 2000 the bugs (Heteroptera) were collected from yarrow, well-known herbaceous plant. It turned out that the bugs made up to 30% on average of all arthropods collected from yarrow, The most numerous were phytophagous bugs (79-96%), among them the known pest of genera Lygus and Plagiognathus. Among zoophagous bugs the most numerous were genera Nab is and Orius. Both of phytophagous and zoophagous bugs of these genera had their life cycle on yarrow. For comparison Heteroptera from yarrow growing in the wild were also collected.

In the years I 999-2000 the studies on the population of true bugs colonizing the inflorescences of quinoa (Chenopodiwn 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.

The research into the occurrence of herbivorous heteroptera of Orthops genus on Sosnowski’s hogweed (Heracleum sosnowskyi Manden.) was carried out over 1999–2002 in the vicinity of Bydgoszcz. The analysis of the faunistic material collected of Heteroptera order showed the occurrence of 3 species where dominant heteroptera were represented by: Orthops campestris L. (48.57%) and Orthops kalmi L.(44.91%), while Orthops basalis Costa was scarce. The maximum abundance of these species coincided with full flowering and the beginning of hogweed fruit formation.