Applications of 2,6-dicarboxypyridine

The invention provides an application of 2,6-dicarboxypyridine in preparation of an antagonistic pesticide against plant pathogenic fungi. The plant pathogenic fungi include one or more selected fromvalsa ambiens and valsa mali, alternaria alternata, botryosphaeria dothidea and rhizoctonia solani. The invention also provides an application of the 2,6-dicarboxypyridine in preparation of a pesticide for preventing or treating a pear rot disease. The invention also provides the antagonistic pesticide against the plant pathogenic fungi, and the components of the pesticide contain at least the 2,6-dicarboxypyridine. The invention also provides the pesticide for preventing or treating the pear rot disease, and the components of the pesticide contain at least the 2,6-dicarboxypyridine. The pesticide prepared from the 2,6-dicarboxypyridine has the effect of being capable of irreversibly killing the valsa ambiens and the valsa mali; and the 2,6-dicarboxypyridine can penetrate tree barks and phloem, 3 mM 2,6-dicarboxyp