Page 125 - Agriculture_Form_3

Agriculture for Secondary Schools

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Figure 7.7: Symptoms of powdery mildew disease on a cowpea plant
Cowpea mosaic virus disease: This disease causes yellow or green patches on
leaves (Figure 7.8). The leaves may curl or become narrow. It is spread by aphids
and negatively affects plant development. It can be managed by controlling
aphids, removing infected plants, and planting resistant varieties.

Figure 7.8: Symptoms of cowpea mosaic virus disease

Activity 7.7

Perform pest and disease control in the school cowpea field by doing the following:
1. Visit a cowpea plot in your school farm and nearby cowpea fields, and check
for signs or symptoms of pests and diseases.

116 Student’s Book Form Three

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AGRICULTURE F3.indd 116 17/09/2025 14:12