| 摘要 |
The present invention provides a method of preventing plants, such as fruit, vegetables etc. from damage by frost. The method consists in treating the said plants, before outbreak of frost, with an effective amount of a hydroxamic acid derivative of formula <IMAGE> wherein R1 is alkyl or cycloalkyl, R2 represents hydrogen or the methyl group, R3 is hydrogen, methyl, alkyl-carbonyl or a cation, and R4 is hydrogen, methyl or ethyl.
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