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The plan should include actions to be taken when limits are exceeded . Researchers have found that when caterpillars fed on the insect-resistant plants , one enzyme - - Mir1-CP or maize insect resistance cysteine protease , in particular - - accumulated at the feeding site within an hour of the caterpillar 's feeding and continued to accumulate at the site for several days . The researchers speculated that the types of businesses in these neighborhoods were less likely to draw elderly people out of their stifling homes during the heat wave , when temperatures topped 100 degrees for several days . Avoid making herbicide applications when temperatures are above 85 degrees F , as control may be reduced and the herbicide is more likely to volatilize and harm landscape plants and vegetables . Muskmelons ripen to the highest quality when the vines remain healthy throughout the harvest period , when temperatures are warm but not excessively high and when the weather is comparatively dry at the time of maturity . An environmentally induced abnormality , end rot occurs when temperatures are too cool during fruit set . You can always change your mind , but giving some thought beforehand to possible settlement terms will help you later when settlements are actually discussed . When reporters cornered him on Monday to ask about Mr. Bush 's remarks , he began by saying , " Well , I want to keep my comments strictly on the facts and the record and to stay out of the politics as much as possible . Use herbicides when temperatures are between 65 and 85 degrees Fahrenheit .