none Nutrition; Diet; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Land and freshwater zones; Palaearctic region; USSR Lema (Criocerinae); Food plants; Triticum; Prevalence & damage caused; Hymenopteran parasites; Anaphes lema & Lemophagus custus; Possible use in control; Population density; Damage to food plants, implications; Ukraine; Forest Steppe zone, population density & control by hymenopteran parasites Lemophagus custus (Ichneumonidae ); Anaphes lema (Mymaridae ); Coleopteran hosts; Lema; Possible use in control; Ukraine; Forest Steppe zone; Possible control of coleopteran hosts