Session 1: Insect Pest Management
Unit 6: Insect Pests, Diseases, and WeedManagement
Textual Question-Answers
Check Your Progress
Fill in the Blanks
1. Tapping of a branch on a white sheet of paper may detect ————— and ————— incidence.
Ans: insect and mite
2. Eradicating and treating sources of inocula in the field is also animportant ————————— measure.
Ans: preventive
3. All insects belong to the class ———————
Ans: Insecta
4. Insect body comprises three main segments, ie., —————, ———— and ——————
Ans: head, thorax and abdomen
5. Greek word pteron means ——————
Ans: wing
6. Termite belongs to order —————
Ans: Isoptera
7. Larvae of caterpillar belong to order —————
Ans: Lepidoptera
Multiple Choice Questions
1. The damaging stage of insects belonging to dipteral family is ————————
(a) larva
(b) adult and maggots
(c) caterpillar
(d) grub
Ans: (a) larva
2. Caterpillar has sucking-type of mouth parts, which are known as——————
(a) homoptera
(b) halter
(c) balancer
(d) haustellum
Ans: (d) haustellum
3. The irregular tunnel-like structure over the leaf surface is observeddue to the feeding of ———————(a) larva
(b) maggots
(c) caterpillar
(d) grub
Ans: (b) maggots
4. Abnormal growth or gall-like structure on the leaves are thedamaging sign of ————————(a) larva
(b) maggots
(c) mites
(d) grub
Ans: (c) mites
Subjective Questions
1. What is insect pest control?
Ans: Insect pest control refers to the management and regulation of insect populations to reduce damage to crops and prevent economic loss.
2. How are insect pests controlled traditionally?
Ans: Traditionally, insect pests are controlled by manual removal, croprotation, use of resistant varieties, cultural practices, traps and application ofplant-based pesticides.
3. Describe Integrated Pest Management.
Ans: Integrated Pest Management is an eco-friendly approach that combines cultural, mechanical, biological and chemical methods to control pests economically while minimising harm to the environment.
4. Write about the following nature of damages: Chewing and cutting tissues of the host
Ans: Insects like caterpillars and beetles chew plant parts such as leaves, stems and flowers, causing defoliation and reduced growth.
Boring
Ans: Boring insects make holes in stems, roots or fruits, damaging vasculartissues and weakening the plant.
Mining leaves
Ans: Leaf miners feed between the epidermal layers of leaves, creatingtunnel-like markings that reduce photosynthesis.
Galls or hypertrophied structures
Ans: Certain insects and mites cause abnormal enlargement of plant tissues, forming galls which interfere with normal plant growth.
Match the Columns
A
1. Grub
2. Lepidoptera
3. Nymph
4. Diptera
5. Hymenoptera
B
(a) Caterpillar
(b) Beetle
(c) Wasp
(d) Isoptera
(e) Maggot
Ans:
1 – (b) Beetle
2 – (a) Caterpillar
3 – (d) Isoptera
4 – (e) Maggot
5 – (c) Wasp
