quick way to take the temperature of crops to determine which ones are under attack. The goal was to let farmersprecisely target pesticide (杀虫剂) spraying rather than rain poison on a whole field, which always includes plants thatdon’t have pest (害虫）problems. 

Even better, Paley^ Remote Scanning Services Company could detect crop problems before they became visibleto tiie eye. An infrared scanner, on a plane flying at 3,000 feet at night, measured the heat send out by crops. The datawas turned into a color-coded map showing where plants were running “fevers' Farmers could then spot-spray, using50 to 70 percent less pesticide than they otherwise would. 

The bad news is that Paley^ company closed down in 1984, after only three years. Farmers resisted the newtechnology and long-term supporters were hard to find. But with the renewed concern about pesticides on produce, andrefinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt about howthe technology works. "This technique can be used on 75 percent of agricultural land in the United States55, saysGeorge Oertfier of Texas A&M. Ray Jackson, who recently retired from the Department of Agriculture, thinkslong-distance infrared crop scanning could be adopted by the end of the decade, but only if Paley finds the financialsupport which he failed to obtain 10 years ago. 

Plant will run a fever when they are ________