以梨和苹果为材料，树干注射４种有机磷农药后第１３ｄ分析，果实中原药残留分别为：氧化乐果１．９、２．４ｍｇ／ｋｇ，久效磷１．３、１．８ｍｇ／ｋｇ，水胺硫磷１．８、３．０ｍｇ／ｋｇ，甲胺磷１.２、０．８ｍｇ／ｋｇ；第２５ｄ果实中原药残留仅在苹果中测到水胺硫磷０．００１×１０－６～０．００５×１０－６，其余３种均未检测出。根据美国、日本的上述４种农药在苹果、梨中最高残留限量：甲胺磷、久效磷、水胺硫磷均为１．０ｍｇ／ｋｇ，氧化乐果２．０ｍｇ／ｋｇ的要求，建议安全间隔期为３０ｄ。 Pear and apple as materials, trunk injection of four kinds of organophosphorus pesticides after 13d analysis, the Central Plains drug residues were: omethoate 1.9,2.4mg / kg, monocrotophos 1.3, 1.8mg / kg, methamidophos 1.8,3.0mg / kg, methamidophos 1.2,0.8mg / kg; 25d Central Plains drug residues measured in apples only chlorisothion 0.001 × 10 -6 ~ 0.005 × 10-6, the remaining three were not detected. According to the United States, Japan, the above four kinds of pesticides in apple and pear maximum residue limits: methamidophos, monocrotophos, acetochlor are 1.0mg / kg, omethoate 2.0mg / kg requirements, it is recommended The safety interval is 30d.