This field observation is from an orchard where aphids feed on young apple trees. Some aphids carry a plant virus between trees as they pierce leaves and ta...
Question 1 Report
This field observation is from an orchard where aphids feed on young apple trees. Some aphids carry a plant virus between trees as they pierce leaves and take sap. The orchard manager releases ladybirds, which eat aphids, and removes heavily infected trees. Leaves on infected trees show a mosaic pattern and make less glucose by photosynthesis. Fewer fruits develop on badly affected plants.
(a) Identify the vector carrying the virus between apple trees. [1]
(b) Explain why releasing ladybirds may reduce the spread of the plant disease. [2]
(c) Give one reason why infected leaves making less glucose can lead to fewer fruits. [1]
(d) Which type of pathogen is causing the mosaic disease? [1]
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