But one of the issue if you have with that is for disease and pests, if you want to have crop rotation which when you only have one place to grow something it's kind of like, am I going to take three years off growing tomatoes.

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Ocean life would die off, while pests and disease would increase, the report says.

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Dr John Morgan, head of the Forestry Commission's plant health service, said the work would help shed light on "the history and nature of the introduction of new pests like Chalara, and in helping to understand how we tackle the disease that's arrived and to understand what the risk of spreading is".

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On a small plot it takes a lot of expensive labor to keep at bay pests like phylloxera and the Japanese beetle, and afflictions like Pierce's disease that destroy vine yields.

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But she says the lower yields of organic farms in any country could be greatly increased as scientists learn more about controlling insects and disease without chemicals, and find the right crops to suit a particular region's pests and climate.

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