-Source-Daily Star- BANANAS could be wiped off the map if more isnt done to conserve them scientists have warned. Experts say a special breed found in Madagascar could hold the key to keeping them alive. But there are only five known trees in existence. Scientists are racing to develop new banana varieties strong enough to survive Panama disease which is a major threat to banana crops around the world. Because bananas are clones the disease is able to spread very quickly from one to another. RISKY: The disease is able to spread very quickly from one to another It is currently wreaking havoc with crops in Asia but could wipe out the worlds supply if it spreads to America. Richard Allen senior conservation assessor at the Royal Botanic Gardens Kew told the BBC: It doesnt have Panama disease in it so perhaps it has genetic traits against the disease.