TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Composition: The composition is substantially free of J. nigra folia (black walnut) and A. sativim (garlic). Also, the composition comprises an effectively parasiticidal amount by weight of P. excelsa (Quassia), F. vulgare (fennel) and A. indica folium (Neem). The composition also comprises a suitable adjuvant, diluent or carrier. The ratio of P. excelsa (Quassia), to F. vulgare (fennel) to A. indica folium (Neem) is P. excelsa (0.5-1.5 parts w/w), F. vulgare (0.5-1.5 parts w/w) to A. indica folium (1.5-2.5 parts w/w). The A. sativim (garlic) and J. nigra folia (black walnut) are present in a non-toxic amount. Moreover, the herbal hematophagous parasite control composition comprises an effective amount of P. excelsa (Quassia) and A. indica folium (Neem). The ratio of P. excelsa (Quassia) to A. indica folium (Neem) is 1:1-1:10 by weight. The composition includes an edible oil, a glass, Glycyrrhiza glabra (Liquorice), and Zingiber officinale. The composition further comprises Quassia amara (Quassia), F. vulgare, (Fennel), A. indica (Neem), G. glabra (Liquorice) and Z. officinale (Ginger). Preferred Method: In controlling hematophagous parasites, the composition is included in the host's feedstuff. Alternatively, controlling hematophagous parasites comprises administration to a host an effective amounts of P. excelsa (Quassia) and A. indica folium (Neem). The ratio of P. excelsa (Quassia) to A. indica folium (Neem) is from 1:1-1:10 by weight. The effective dose is administered to the animal at least once a month. The composition is pre-prepared prior to the time of use. The amount administered to a herd when incorporated into a feed is a ratio of from 1:10-1:100 parasite control composition to feed. The herd is a deer herd. The method includes a pre-treatment on a lower dose than the usually administered dose. The pre-treatment dose comprises a daily dose of from 0.01 to 10 mg/kg of animal weight. The method includes a maintenance dose which is a lower dose than the usually administered dose. The maintenance dose comprises a daily dose of from 0.001 to 5 mg/kg of animal weight. The composition is in the form of a solution, suspension, emulsion, microemulsion, cream, pellet, tablet or gelatin capsule. The composition is coated onto a grit or incorporated into a glass. Manufacturing the composition comprises mixing the required amounts of P. excelsa (Quassia) and A. indica folium (Neem). Alternatively, manufacturing the herbal hematophagous parasite control composition comprises culturing cells of P. excelsa (Quassia), F. vulgare (fennel) and A. indica folium (Neem) together or separately. The herbal hematophagous parasite control composition is a slow release composition. ACTIVITY - Antiparasitic. No biological data given.    MECHANISM OF ACTION - None given.    ADMINISTRATION - Dosage of the composition to be administered is 0.001-5 g/kg. Administration can be through oral route (all claimed).    EXAMPLE - No suitable example given.