Introduction: Medicinal plants face diverse pests — insect herbivores, fungal and bacterial pathogens, nematodes and storage pests — that reduce yield and alter active constituents. Effective pest management in medicinal plants combines pest identification, life‑cycle knowledge, symptom recognition, regular sampling, economic thresholds and safe control measures. Key strategies include cultural practices, biological control, botanicals, selective pesticides, integrated pest management (IPM), quarantine and residue monitoring to protect therapeutic quality. B.Pharm students should learn pesticide classes, modes of action, resistance management, environmental and human safety, and Good Agricultural Practices (GAP) to ensure herbal medicine safety and efficacy. Now let’s test your knowledge with 30 MCQs on this topic.
Q1. Which pest group most commonly produces systemic infections that can change the alkaloid profile of medicinal plants?
- Insect herbivores
- Fungal pathogens
- Vertebrate pests
- Contact mites
Correct Answer: Fungal pathogens
Q2. What is the primary goal of Integrated Pest Management (IPM) in medicinal plant production?
- Eliminate all organisms from the field
- Maximize pesticide use to prevent any damage
- Reduce pest populations below economic thresholds using sustainable tactics
- Use only biological agents regardless of severity
Correct Answer: Reduce pest populations below economic thresholds using sustainable tactics
Q3. Which biological control agent is commonly used against insect pests of medicinal plants by producing crystal proteins toxic to larvae?
- Beauveria bassiana
- Bacillus thuringiensis (Bt)
- Trichoderma harzianum
- Pochonia chlamydosporia
Correct Answer: Bacillus thuringiensis (Bt)
Q4. Which class of insecticides acts primarily by inhibiting acetylcholinesterase?
- Pyrethroids
- Neonicotinoids
- Organophosphates and carbamates
- Insect growth regulators
Correct Answer: Organophosphates and carbamates
Q5. What is a common cultural method to reduce fungal disease in medicinal herb fields?
- Increasing plant density to retain moisture
- Frequent overhead irrigation at night
- Crop rotation and improved drainage
- Applying broad‑spectrum insecticides
Correct Answer: Crop rotation and improved drainage
Q6. Which pesticide property describes how long a chemical remains active on the plant or in the environment?
- Mode of action
- Persistence
- Formulation type
- Systemicity
Correct Answer: Persistence
Q7. Which agent is an entomopathogenic fungus used for biological control of chewing and sucking pests in medicinal crops?
- Trichoderma viride
- Beauveria bassiana
- Bacillus subtilis
- Paecilomyces lilacinus
Correct Answer: Beauveria bassiana
Q8. What does MRL stand for and why is it important in medicinal plant production?
- Maximum Residue Limit; ensures pesticide residues are within safe regulatory levels
- Minimum Residue Level; ensures enough pesticide remains to be effective
- Maximum Resource Limit; controls fertilizer use
- Minimum Recovery Limit; relates to post‑harvest drying
Correct Answer: Maximum Residue Limit; ensures pesticide residues are within safe regulatory levels
Q9. Which botanical pesticide contains azadirachtin and is frequently used in organic management of medicinal plants?
- Pyrethrum
- Neem (Azadirachta indica) extract
- Nicotine sulfate
- Rotenone
Correct Answer: Neem (Azadirachta indica) extract
Q10. Which monitoring tool is most appropriate for detecting adult moth pests in medicinal plant fields?
- Pheromone traps
- Soil moisture probes
- Sticky cards for aphids only
- Funnel traps for rodents
Correct Answer: Pheromone traps
Q11. Systemic pesticides differ from contact pesticides because systemics:
- Remain only on leaf surfaces
- Are absorbed and translocated within plant tissues
- Are always biodegradable within hours
- Only affect soil organisms
Correct Answer: Are absorbed and translocated within plant tissues
Q12. Which beneficial insect is a key predator of aphids in herbal crop systems?
- Honey bee (Apis mellifera)
- Ladybird beetle (Coccinellidae)
- Three‑spined stickleback
- House fly (Musca domestica)
Correct Answer: Ladybird beetle (Coccinellidae)
Q13. Which nematicidal biological control fungus parasitizes nematode eggs and is useful in medicinal plant nurseries?
- Pseudomonas fluorescens
- Pochonia chlamydosporia
- Beauveria bassiana
- Trichogramma spp.
Correct Answer: Pochonia chlamydosporia
Q14. What is the recommended immediate action when a new invasive pest is detected in a medicinal plant field?
- Ignore and hope natural enemies arrive
- Implement quarantine and report to authorities
- Broadcast high‑dose insecticide over the landscape
- Harvest immediately and leave residues
Correct Answer: Implement quarantine and report to authorities
Q15. Which fungicide group is systemic and acts by inhibiting ergosterol biosynthesis in fungi?
- Chlorothalonil (a multi‑site contact fungicide)
- Triazoles (DMI fungicides)
- Copper oxychloride
- Sulfur dust
Correct Answer: Triazoles (DMI fungicides)
Q16. Economic threshold in IPM is defined as the pest density at which:
- All pests must be eradicated
- Control action should be taken to prevent economic injury
- The crop is ready for harvest
- Natural enemies are absent
Correct Answer: Control action should be taken to prevent economic injury
Q17. Which storage pest commonly infests dried medicinal seeds and roots during post‑harvest storage?
- Rice weevil (Sitophilus oryzae)
- Colorado potato beetle
- Diamondback moth
- Locusts
Correct Answer: Rice weevil (Sitophilus oryzae)
Q18. Which practice reduces pesticide residues and helps meet Good Agricultural Practices (GAP) for medicinal plants?
- Ignoring pre‑harvest interval and harvesting early
- Using labeled rates, observing pre‑harvest intervals and proper application timing
- Spraying at night regardless of label instructions
- Applying unregistered mixes to increase efficacy
Correct Answer: Using labeled rates, observing pre‑harvest intervals and proper application timing
Q19. Which mode of action describes pyrethroid insecticides?
- Sodium channel modulators causing rapid paralysis
- Inhibition of chitin synthesis
- Juvenile hormone analogs disrupting development
- Photosystem II inhibitors
Correct Answer: Sodium channel modulators causing rapid paralysis
Q20. Which sampling method is commonly used for monitoring aphid populations on medicinal herbs?
- Soil core sampling
- Yellow sticky traps and plant counts
- Bird netting over the field
- Acoustic detection
Correct Answer: Yellow sticky traps and plant counts
Q21. Which resistance management strategy helps delay pesticide resistance in pest populations?
- Repeated use of the same mode of action each season
- Rotating pesticides with different modes of action and integrating non‑chemical controls
- Always using the highest label dose regardless of pest pressure
- Applying pesticides at random intervals
Correct Answer: Rotating pesticides with different modes of action and integrating non‑chemical controls
Q22. Which pesticide formulation is water‑dispersible and commonly used for foliar sprays as a wettable powder?
- Emulsifiable concentrate (EC)
- Wettable powder (WP)
- Granules (G)
- Seed coating (SC)
Correct Answer: Wettable powder (WP)
Q23. Which molecule class acts on insect nicotinic acetylcholine receptors and has systemic activity in plants?
- Organophosphates
- Neonicotinoids
- Pyrethroids
- Fumigants
Correct Answer: Neonicotinoids
Q24. Which cultural practice can lower soil‑borne disease pressure in medicinal plant nurseries?
- Using contaminated re‑used potting mix
- Sanitation, sterilized media, and avoiding overwatering
- Continuous monoculture in the same beds
- Planting at extremely high density
Correct Answer: Sanitation, sterilized media, and avoiding overwatering
Q25. Which beneficial microorganism is used as a biofungicide to suppress root and soil pathogens in herbal crops?
- Trichoderma spp.
- Varroa destructor
- Helicoverpa armigera
- Bemisia tabaci
Correct Answer: Trichoderma spp.
Q26. Which pesticide safety measure is essential for applicators to reduce exposure risk?
- Wearing appropriate personal protective equipment (PPE) and following label instructions
- Applying during windy conditions to save time
- Mixing pesticides without gloves to feel concentration
- Eating in the spray zone to monitor effects
Correct Answer: Wearing appropriate personal protective equipment (PPE) and following label instructions
Q27. Which diagnostic sign indicates nematode damage in medicinal plant roots?
- Normal, healthy fibrous roots
- Root galls, stunting and yellowing of foliage
- Powdery white growth on leaves only
- Bird peck marks on leaves
Correct Answer: Root galls, stunting and yellowing of foliage
Q28. Which approach is most compatible with preserving pollinators in medicinal plant agroecosystems?
- Spraying broad‑spectrum insecticides during bloom
- Applying targeted controls outside flowering periods and using selective products
- Removing all flowering plants to avoid attracting pollinators
- Using systemic neonicotinoids at full rate during flowering
Correct Answer: Applying targeted controls outside flowering periods and using selective products
Q29. Which pest management tool uses traps with attractive colors to monitor or control flying insects like whiteflies?
- Blue or yellow sticky traps
- Soil temperature traps
- Light traps for vertebrates
- Hand nets for slugs
Correct Answer: Blue or yellow sticky traps
Q30. Why must B.Pharm students study pest management specific to medicinal plants rather than general field crops?
- Medicinal plants never suffer from pests so study is unnecessary
- Because pest control affects active constituents, residue limits, therapeutic efficacy and patient safety
- Because medicinal plants always tolerate high pesticide residues
- Because only synthetic pesticides are allowed on medicinal crops
Correct Answer: Because pest control affects active constituents, residue limits, therapeutic efficacy and patient safety
