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Agriculture for Secondary Schools

while overwatering should be avoided in bean crops. The use of seeds treated
with recommended fungicides can also help in managing the disease.

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Figure 5.4 (c): Symptoms of root rot in beans

Bean common mosaic virus disease (BCMVD): This is a serious common bean
disease. It causes mottled yellow-green leaves and poor plant growth. The virus
also lowers the number and size of bean pods. BCMVD is spread by aphids and
infected seeds. Using certified seeds and controlling aphids helps to prevent the
virus from spreading. Figure 5.4 (d) shows symptoms of BCMVD in beans.

Figure 5.4 (d): Symptoms of BCMVD in bean crop

Student’s Book Form Three 77

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AGRICULTURE F3.indd 77
AGRICULTURE F3.indd 77 17/09/2025 14:11