none The graminaceous weed, Coix lachryma-jobi , which grows along with sugarcane and in fallow lands, is an important host of the polyphagous stem borer, Chilo partellus in Uttar Pradesh (India). In November, the borer builds up high populations on C. lachryma-jobi and undergoes hibernation in it. Apanteles flavipes kills 90.57% and 100% hibernating larvae of C. partellus in C. lachryma-jobi in three to four months from November to February. While 50% larvae of Chilo auricilius present in C. lachryma-jobi are parasitised by A. flavipes , it does not contribute significantly to suppress the population of C. auricilius in sugarcane, suggesting that sugarcane is not a preferred habitat of A. flavipes in India. Nutrition; Diet; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Host parasite relationships; Ecology; Population dynamics; Land and freshwater zones; Oriental region Chilo (Pyralidae); Food plants; Coix lachryma jobi & Saccharum officinarum; Larval abundance & regulation by hymenopteran parasite; India Chilo auricilius; Chilo partellus (Pyralidae ); Hymenopteran parasites; Apanteles flavipes; Prevalence & population regulation; Prevalence; Apanteles flavipes (Hymenoptera); Population dynamics; Larval abundance on food plant, regulation by hymenopteran parasite; Population regulation; Larvae on food plant, contribution of hymenopteran parasite; India; Uttar Pradesh; Golagokarannath; Abundance on food plant & regulation by hymenopteran parasite Apanteles flavipes (Braconidae); Lepidopteran hosts; Chilo auricilius & C. partellus; Prevalence & host population regulation on food plants; Prevalence; Chilo (Lepidoptera) larvae on food plants; India; Uttar Pradesh; Golagokarannath, prevalence & host population regulation