Agricultural Pests — DU B.Sc. (Prog.) Applied Life Sciences with Agrochemicals and Pest Management pertaining to Zoology Previous Year Question Papers

Chemical & Pest Management Attempt various parts of a question at one place only. Draw well-labelled diagram wherever necessary. 1. (a) Define the following terms: 3x1-3 Chaffy grains (b) Differentiate between the following pairs : 3x2=6 (i) Polyphagous and Monophagous pest • (i) Solitary and Gregarious phases of desert locust (iii) Dead heart and Bunchy top (c) Write scientific names of the following insect : 2x1=2 (i) Dusky cotton bug (ii) Khapra beetle (d) Fill in the blanks : 4x1=4 (i) Larval stage of Achaea janata is called as (i) The first instar nymph of. .. pest has a whitish thorax and abdominal segment bearing a pair of anal filaments. (iti) Larvae of :. ….• pest eat the endosperm and germ, leaving empty light weight grains with characteristic "window" holes for' adult emergence.. • x.'. (iv) The most effective chemical against mustard aphid is ... (a) Describe the economic importance, life cycle and control measures of 8. Sitophilus oryzae. (6) Describe the life cycle, economic importance 'and control measures of 3. {a) Discuss the adult characteristics, damage caused and control measures of (6) Explain the life cycle and crop damage of any two sugarcane insect pests. 4. (a) Write the classification of agricultural pests based on the different modes (occurrence, host range, economic impact, etc.) with suitable examples. 8 : (b) Describe the feeding damage, life cycle and management of Macrosiphum miscanthi on crops. 7 5. (a) Give the scientific names of important pests of Paddy. Describe the biology, nature of damage caused and control measure for any one of them. 8 - (b) Write the classification of pesticides based on their mode of entry and chemical reaction. 7 6. Write short notes on any three of the following : 3x5=15 (i) Life cycle of Hispa (Dicladispa) armigera and its damage. (ii) Biology of Sesamia inferens with their control measures. (i) Ecological and professional approaches to reduce bird damage. (iv) Distribution and host range of any two major agricultural pests.