| 1 | Suddenly he saw water pouring out of a hole in the wall of an irrigation ditch. | |
| 2 | Working in his pecan orchard in Fort Valley, Ga., south of Atlanta, farmer Trent Mason leans over and fiddles with the irrigation system. | |
| 3 | Temperatures here can reach up to 45C in summer but irrigation canals and oxen-powered pumps keep Nile water streaming in all year round. | |
| 4 | MacKinnon says the alien species can reduce crop yields, choke irrigation canals, block hydroelectric dams and cut the lifespan of development investments. |
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