虽然砒酸钙在植物保护上不占重要地位,我们觉得去年夏天在武安山区柿虫防治工作中所发现的它表现药害的规律,还是值的介绍的。当年我们要保护的对象有核桃,木撩(黄连木),柿子和软枣(君迁子)四种。准备使用的药剂则有滴滴涕、六六六、砒酸铅和砒酸钙四类。顾及到在推广中某种药对一些树种会产生药害,所以从5月23日开始到9月13日止前后做了四次药害试验。试验进 Although calcium 砒 acid does not play an important role in plant protection, we think the law of phytotoxicity found in the persimmon control work in the mountainous area of ​​Wu’an last summer is still an introduction. The year we want to protect the object of walnut, wood up (Pistacia chinensis), persimmon and soft jujube (Junliangzi) four. Preparations for the use of drugs are DDT, BHC, 砒 lead acid and calcium 四 four categories. Taking into account the promotion of a drug on some tree species will produce phytotoxicity, so from May 23 to September 13 before and after doing four phytotoxicity tests. Test into