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○■ As for English among begi nning insect (the insect) and the like general term is important, but when you improve, you think that it is necessary individual name to remember
○■ With 800 million chronica lly undernourished and anything that reduces the food supply has potential for tragedyA lethal stem rust has spread to southern Africa's wheat crop. The fungus, identified in Uganda in 1999 and called Ug99 and is a new contender in the long hot war between plant breeders and plant pests. Stem rust is an old enemy, but until Ug99 turned up and plant breeders had thought they were in the ascendant. The spread of yet another destructive element - along with drought, flood, locusts and windstorm and rising fuel costs - in the challenges that face the African farmer is a reminder of several things. One is that in a world in which 800 million people are chronically undernourished and more than 2 billion live ON $2 a day and anything that reduces the food supply has potential for tragedy. A second is that agricultural science is a battle that can never be won outright. Any evolutionary biologist would have predicted the arrival of a new pathogen - and any evolutionary biologist would also predict that somewhere in the plant world there must already be genes resistant to the latest devastating pest. These genes must be identified and then spliced or bred into appropriate varieties and distributed to the blighted areas. All of which takes time, money and manpower and relentless scholarship. But the stem rust is a reminder of two more unforgiving facts of life. One is that as human population levels continue to rise and the farmland available to feed each individual ON the planet continues to fall. Sooner or later and there could be a crisis of the kind predicted by Thomas Malthus more than 200 years ago. The reason there has been no Malthusian crisis so far is that as the population doubled and agricultural science tripled crop yields. Ominously, although yields are still increasing and t 800. TragedyA which decreases chronic food supply, what is spreading to the harvest of the wheat of nutrition and southern Africa 致. . There is a possibility of the rust
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