Page 106 - Agriculture_Form_3

Agriculture for Secondary Schools

their larvae tunnel inside, causing wilting, stunted growth, and plant death. Dark
entry spots may appear on stems. Management of bean fly includes crop rotation,
use of resistant varieties, soil amendments, and mulching to prevent egg-laying.
Severe infestations may require application of insecticides under the guidance of
an expert.
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Figure 6.4 (e): Bean fly and its damage on common pea

Common pea weevil: Pea weevils are small brown beetles that lay eggs on
developing pea pods. Their larvae bore into seeds, making them unsuitable for
eating or planting. Infested pods show dark egg spots, while adult weevils chew
holes in dry seeds, reducing quality and value. Damage can start in the field
and continue in storage. Management includes planting certified healthy seeds,
timely harvesting, proper storage, and using biopesticides such as neem leaves or
ash to deter insects. Insecticides may be used under expert guidance. Figure 6.4
(f) shows the pea weevil egg-laying marks on the pea pod surface, larval feeding
inside developing seeds, and round holes in dry seeds caused by emerging adult
weevils.

Figure 6.4 (f): Common pea weevil and its damage to common pea

Student’s Book Form Three 97

17/09/2025 14:12
AGRICULTURE F3.indd 97 17/09/2025 14:12
AGRICULTURE F3.indd 97