(a) State each of the disease condition observed on specimens J (MAIZE PLANT) and K (CASSAVA LEAF) and their causative agents.
(b) Explain the mode of transmission of the diseases on each of specimens J and K.
(c) State two effects each of the diseases on Specimens J and K and two control measures of each
(d) Name two other diseases of specimen K.
(a) Specimen J is maize plant with leaves showing a mosaic pattern/infection, tomato plant, showing leaf curl.
The causative agent for this Condition is virus.
Specimen K is cassava leaf, showing leaf spot.
The causative agent is fungus.
(b) For specimen J, the virus is transmitted by an aphid vector.
For specimen K, the fungus is air- borne, water and rain splash
(c) Specimen J (effects):
-It results in stunted growth of plants.
-It leads to reduction in yield of plants.
-It causes reduction in the photosynthetic area of the leaf.
Control measures include:
-early planting:
Control measures include:
-application of fungicides,
-use of resistant varieties,
-removal and burning of infected plants, and
-crop rotation.
-removal and burning of infected plants;
-eradication of insect vectors;
-use of resistant varieties; and
-crop rotation
For specimen K (effects);
-It causes reduction in yield of crop or plant.
-It leads to the reduction in the rate of growth of plants.
-It also leads to reduction in the photosynthetic area of the leaves.
(d) Other diseases of specimen K are;
-Cassava mosaic
-Cassava blight
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