10) b) Write the causative microorganism, mode of transmission, symptoms. and preventive measures for citrus canker. Plant disease Citrus canker Causative microorganisms Mode of transmission Symptoms Preventive measures
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Answers
Answer:
Causative Agent of Citrus canker is Xanthomonas citri.
Mode of transmission : Citrus canker is highly contagious and can be spread rapidly by:
- Wind-driven rain
- Lawnmowers and other landscaping or farm equipment
- People carrying the infection on their hands, clothing or equipment
- Moving infected or exposed plants or plant parts (fruit, leaves or stems)
Symptoms:
Citrus canker symptoms include brown spots on leaves, often with an oily or water-soaked appearance. The spots (technically called lesions) are usually surrounded by a yellow halo, and they can be seen on both the upper and lower sides of the leaf. Similar symptoms can appear on fruit and stems.
Canker causes the citrus tree to continually decline in health and fruit production until the tree produces no fruit at all.
Prevention:
Transport of infected plant material is the primary means of spreading the canker pathogen over long distances. To help prevent the spread of citrus canker, homeowners are required to purchase citrus trees from a certified nursery.
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