Pest Control
Muhtasari
A field of healthy maize can be stripped to bare stalks in days when an army of caterpillars marches through it, and a thriving vegetable crop can be slowly drained by clouds of tiny aphids that you have to look closely to see. Pests are animals, mostly insects, that damage crops, and learning how each one lives is the first step to stopping it.
In this lesson you will follow the life cycle of a named insect pest, see how biting, sucking and boring pests damage crops in different ways, and learn the four families of control: chemical (contact and systemic pesticides), biological, biotechnical and cultural. You will learn why crop rotation breaks a pest's life cycle and how a systemic pesticide reaches a pest hidden inside the plant.
Malengo
- (a) describe the life cycle, effect and method of spread of one pest from each of the following: • biting and chewing pests (e.g. grasshoppers, locusts, termites, leaf miners and beetles) • piercing and sucking pests (e.g. aphids, Bagrada bugs, mealy bugs and scale insects) • boring pests (e.g. weevils, stalk borer and American bollworm (Helicoverpa armigera)).
- (b) name and describe the mode of action of chemical controls for pests including contact pesticides and systemic pesticides and understand the appropriate use of these pesticides in controlling pests in the groups listed above.
- (c) describe biological and biotechnical methods of controlling pests.
- (d) describe methods of cultural pest control including rotation and catch cropping.
Somo la Sauti
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Kadi za kumbukumbu
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Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Pest Control. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Aphids damage crops mainly because they: A. Chew the leaves down to the veins B. Pierce the plant, suck sap and spread viruses C. Bore into the grain D. Eat the roots Answer: B
- Which stage of the African armyworm causes the damage to crops? A. Egg B. Larva (caterpillar) C. Pupa D. Adult moth Answer: B
- A systemic pesticide controls a pest by: A. Killing it only where the spray touches it B. Being absorbed into the plant so the pest is killed when it feeds C. Trapping it with a scent D. Drowning it Answer: B
- Crop rotation helps to control pests because it: A. Adds nutrients to the soil only B. Breaks the pest's life cycle by removing its food crop C. Increases the number of pests D. Replaces the need for harvesting Answer: B
- Which of these is an example of biological pest control? A. Spraying a contact insecticide B. Using ladybirds to eat aphids C. Ploughing the field D. Diluting a herbicide Answer: B
Fanyia kazi maswali haya kwenye programu
Fanyia kazi maswali haya kwenye programu
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Pest Control? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
